Updated on 2022/03/23

写真a

 
OHNO, Noriyasu
 
Organization
Graduate School of Engineering Electrical Engineering 2 Professor
Graduate School
Graduate School of Engineering
Undergraduate School
School of Engineering Electrical Engineering, Electronics, and Information Engineering
Title
Professor
Contact information
メールアドレス

Degree 1

  1. 博士(理学) ( 1995   九州大学 ) 

Research Interests 5

  1. Plasma-gas interactions

  2. Plasma-material interactions

  3. Nuclear Fusion

  4. Plasma

  5. Plasma-gas interactions

Research Areas 4

  1. Energy Engineering / Fundamental plasma  / Nonlinear phenomena, Chaos Wave, Atomic/molecular process

  2. Energy Engineering / Applied plasma science  / Surface treatment, Nano structure

  3. Energy Engineering / Nuclear fusion  / Divertor, Edge plasma, Plasma -wall interaction

  4. Energy Engineering / Fundamental plasma  / Nonlinear phenomena, Chaos Wave, Atomic/molecular process

Current Research Project and SDGs 2

  1. Development of new functional materials by using plasma

  2. Controlling edge plasmas aimed at magnetically confined fusion power station

Research History 9

  1. Nagoya University   Graduate School of Engineering Plasma Nanotechnology Research Center   Director in General

    2017.4 - 2019.3

  2. Nagoya University   Professor

    2008.4

  3. Nagoya University   Professor

    2008.4

  4. Nagoya University   Assistant Professor

    2005.4 - 2008.3

  5. Nagoya University   Assistant Professor

    2003.4 - 2005.3

  6. Nagoya University   Assistant Professor

    2002.2 - 2003.3

  7. Nagoya University   Lecturer

    1995.4 - 2002.1

  8. Nagoya University   Assistant

    1990.10 - 1995.3

  9. Nagasaki University   Assistant

    1988.4 - 1990.9

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    Country:Japan

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Education 4

  1. Kyushu University

    1997.4 - 1998.3

  2. Kyushu University

    1987.4 - 1988.3

  3. Kyushu University   Graduate School, Division of Integrated Science and Engineering

    1985.4 - 1987.3

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    Country: Japan

  4. Kyushu University   Faculty of Science

    1981.4 - 1985.3

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    Country: Japan

Professional Memberships 3

  1. プラズマ・核融合学会

  2. 日本物理学会

  3. 電気学会

Committee Memberships 93

  1. 大学改革支援・学位授与機構国立大学教育研究評価委員会   専門委員  

    2020.2 - 2021.3   

  2. 量子科学技術研究開発機構核融合エネルギーフォーラム   専門委員  

    2020.1 - 2022.3   

  3. 量子科学技術研究開発機構炉心プラズマ共同企画委員会   委員  

    2019.6 - 2020.3   

  4. 核融合科学研究所運営会議   委員  

    2019.5 - 2021.4   

  5. 九州大学附属高温プラズマ理工学研究センターQUEST実験推進会議   委員  

    2019.4 - 2021.3   

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    Committee type:Other

  6. 文部科学省科学技術・学術審議会専門委員会   委員  

    2019.4 - 2021.2   

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    Committee type:Government

  7. XXXIV International Conference on Phenomena in Ionized Gases and 10th International Conference on Reactive Plasmas   ICRP International Organizing Committee  

    2018.10 - 2019.7   

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    Committee type:Academic society

  8. 核融合エネルギーフォーラムダイバータ研究開発加速戦略方策検討評価ワーキンググループ   専門委員  

    2018.10 - 2019.3   

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    Committee type:Other

  9. 核融合科学研究所運営会議次期計画検討委員会   委員  

    2018.9 - 2019.4   

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    Committee type:Other

  10. 量研機構 炉心プラズマ共同企画委員会   委員  

    2018.6 - 2019.3   

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    Committee type:Other

  11. 筑波大学プラズマ研究センター双方向型共同研究審査委員会   委員  

    2018.4 - 2020.3   

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    Committee type:Other

  12. 東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用委員会   委員  

    2018.4 - 2020.3   

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    Committee type:Other

  13. ISPlasma 2019/IC-PLANTS2019組織委員会   委員  

    2018.4 - 2019.3   

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    Committee type:Academic society

  14. 一般社団法人プラズマ・核融合学会   領域長  

    2018.1 - 2018.12   

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    Committee type:Academic society

  15. ISPlasma 2018/IC-PLANTS2018組織委員会   プログラム委員  

    2017.11 - 2018.3   

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    Committee type:Academic society

  16. ISPlasma 2018/IC-PLANTS2018組織委員会   組織委員  

    2017.11 - 2018.3   

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    Committee type:Academic society

  17. 核融合科学研究所運営会議外部評価委員会   委員  

    2017.9 - 2019.3   

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    Committee type:Other

  18. 核融合エネルギーフォーラム専門委員会   専門委員  

    2017.9 - 2018.3   

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    Committee type:Other

  19. 日本学術振興会特別研究員等審査会および国際事業委員会   審査員  

    2017.8 - 2018.7   

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    Committee type:Academic society

  20. 日本学術振興会 特別研究員等審査会   専門委員  

    2017.8 - 2018.7   

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    Committee type:Other

  21. 日本学術振興会 国際事業委員会   書面審査員・書面評価員  

    2017.8 - 2018.7   

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    Committee type:Other

  22. 日本学術振興会 卓越研究員候補者選考委員会   書面審査員  

    2017.8 - 2018.7   

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    Committee type:Other

  23. プラズマ技術産業応用センター運営会議   委員  

    2017.7 - 2018.3   

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    Committee type:Municipal

  24. 量研機構 炉心プラズマ共同企画委員会   委員  

    2017.6 - 2019.3   

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    Committee type:Other

  25. 第12回核融合エネルギー連合講演会組織委員会   委員  

    2017.6 - 2018.12   

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    Committee type:Academic society

  26. 量子科学技術研究開発機構炉心プラズマ共同企画委員会   委員  

    2017.6 - 2018.3   

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    Committee type:Other

  27. 核融合科学研究所運営会議   委員  

    2017.5 - 2019.4   

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    Committee type:Other

  28. 自然科学研究機構核融合科学研究所運営会議   委員  

    2017.5 - 2019.4   

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    Committee type:Other

  29. 中部電力株式会社電力技術研究会電源専門部会   専門委員  

    2017.4 - 2021.3   

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    Committee type:Other

  30. 九州大学附属高温プラズマ理工学研究センターQUEST実験推進会議   委員  

    2017.4 - 2019.3   

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    Committee type:Other

  31. 中部電力 電力技術研究会電源専門部会   専門委員  

    2017.4 - 2019.3   

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    Committee type:Other

  32. 核融合科学技術委員会   科学技術・学術審議会専門委員  

    2017.4 - 2019.2   

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    Committee type:Government

  33. 科学技術・学術審議会専門委員会   専門委員  

    2017.3 - 2019.2   

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    Committee type:Government

  34. 核融合科学研究所日米次期共同プロジェクト推進小委員会   委員  

    2017.1 - 2018.3   

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    Committee type:Other

  35. 量子科学技術研究開発機構核融合エネルギーフォーラム専門委員会   専門委員  

    2016.10 - 2017.3   

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    Committee type:Other

  36. 日本原子力研究開発機構核融合エネルギーフォーラム   専門委員  

    2015.8 - 2016.3   

  37. プラズマ・核融合学会広報委員会   広報委員  

    2015.7 - 2017.6   

  38. 日本原子力研究開発機構炉心プラズマ共同企画委員会プラズマ実験・システム開発専門部会   専門委員  

    2015.6 - 2016.3   

  39. 核融合科学研究所運営会議   委員  

    2015.5 - 2017.4   

  40. 文部科学省科学技術・学術審議会   専門委員  

    2015.3 - 2017.2   

  41. 核融合科学技術委員会   委員  

    2015.3 - 2017.2   

  42. 日本学術振興会科学研究費委員会   専門委員  

    2014.12 - 2015.11   

  43.   学会現地実行委員  

    2013.4 - 2015.3   

  44.   国際会議国際組織委員  

    2012.9 - 2013.3   

  45. JT-60改修計画及び炉心プラズマ共同企画委員会   専門委員 JT-60SA専門部会  

    2012.7 - 2013.3   

  46.   国際会議国際組織委員  

    2012.5 - 2013.3   

  47. The 23rd International Toki Conference(ITC-23)   International Advisory Committee  

    2012.5 - 2013.3   

  48. TEXTOR国内技術委員会   委員  

    2012.4 - 2014.3   

  49. ISPlasma2013プログラム委員会   委員  

    2012.4 - 2013.3   

  50. 九州大学附属高温プラズマ力学研究センターQUEST実験推進会議   委員  

    2012.4 - 2013.3   

  51. ISPlasma2013組織委員会   委員  

    2012.4 - 2013.3   

  52. 核融合科学研究所運営会議外部評価委員会専門部会   専門委員  

    2011.10 - 2012.3   

  53. 平成23年度炉心プラズマ共同企画委員会   専門委員 JT-60SA専門部会  

    2011.8 - 2012.3   

  54. プラズマ・核融合学会企画第2小委員会   委員  

    2011.7 - 2013.6   

  55. 核融合科学研究所運営会議共同研究委員会   委員  

    2011.6 - 2013.4   

  56. ISPlasma2012組織委員会   委員  

    2011.4 - 2012.4   

  57. ISPlasma2012プログラム委員会   委員  

    2011.4 - 2012.4   

  58. 日米次期共同プロジェクト推進小委員会   委員  

    2011.2 - 2012.3   

  59. プラズマ・核融合学会 Plasma and Fusion Research   常務エディタ  

    2010.12 - 2012.11   

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    Committee type:Academic society

  60. 筑波大学プラズマ研究センター双方向型共同研究審査委員会   委員  

    2010.7 - 2012.3   

  61. 平成22年度JT-60専門部会   専門委員  

    2010.6 - 2011.3   

  62. 21st International Toki Conference (ITC-21)   International Program Committee  

    2010.5 - 2011.12   

  63. TEXTOR国内技術委員会   委員  

    2010.4 - 2012.3   

  64. ISPlasma2011プログラム委員会   委員  

    2010.4 - 2011.4   

  65. ISPlasma2011組織委員会   委員  

    2010.4 - 2011.4   

  66. 核融合科学研究所運営会議共同研究委員会   委員  

    2009.6 - 2011.4   

  67. 炉心プラズマ共同企画委員会   専門委員(JT-60専門部会、JT-60SA専門部会)  

    2009.6 - 2010.3   

  68. 20th International Toki Conference(ITC-20)   International Program Committee  

    2009.5 - 2010.12   

  69. ISPlasma2010プログラム委員会   委員  

    2009.4 - 2010.4   

  70. ISPlasma2010組織委員会   委員  

    2009.4 - 2010.4   

  71. 国際トカマク物理活動(スクレイプ・オフ層及びダイバータの物理)   国際委員  

    2008.4   

  72. 電気学会 編集専門第3部会   委員  

    2008.4 - 2010.3   

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    Committee type:Academic society

  73. 18th International Toki Conference (ITC-18)   International Program Committee  

    2007.5 - 2008.12   

  74.   国際プログラム委員会委員  

    2007.4 - 2008.3   

  75.   国際組織委員会委員  

    2007.1 - 2007.12   

  76. 日本原子力研究開発機構 炉心プラズマ研究共同企画委員   専門委員  

    2006.10 - 2007.3   

  77. 日本原子力研究所「SOL及びダイバータに関する研究」   研究嘱託委員  

    2006.4 - 2008.3   

  78.   現地実行委員会委員  

    2006.4 - 2007.3   

  79. プラズマ・核融合学会   論文賞・技術進歩賞・学術奨励賞・産業技術賞選考委員  

    2006.4 - 2007.3   

  80. プラズマ・核融合学会 研究調査専門委員会   委員  

    2006 - 2009   

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    Committee type:Academic society

  81. プラズマ・核融合学会 論文賞・技術進歩賞・学術奨励賞産業技術賞選考委員会   委員  

    2006   

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    Committee type:Academic society

  82. プラズマ・核融合学会企画委員会   企画委員・企画第2小委員会委員ーSSH活動  

    2004.9 - 2007.6   

  83. プラズマ・核融合学会企画委員会、企画第2小委員会   委員  

    2004.4 - 2007.3   

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    Committee type:Academic society

  84. 日本原子力研究所核融合研究委員会   専門委員  

    2003.6 - 2005.9   

  85. 日本物理学会 分科会(放電)   世話人  

    2002.4 - 2004.3   

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    Committee type:Academic society

  86. 日本物理学会分科会(放電)   世話人  

    2001.5 - 2003.4   

  87. 電気学会東海支部   「若手セミナー」世話人  

    2001.4 - 2003.3   

  88.   現地実行委員会委員  

    2001.4 - 2002.3   

  89.   現地実行委員会委員  

    2001.2 - 2002.12   

  90.   現地実行委員会委員  

    2001.2 - 2002.12   

  91.   現地実行委員会委員  

    1999.4 - 2000.3   

  92. プラズマ・核融合学会編集委員会   企画幹事  

    1997.7 - 2000.3   

  93.   現地実行委員会委員  

    1996.4 - 1997.3   

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Awards 5

  1. プラズマ・核融合学会賞技術進歩賞

    2020.12   プラズマ・核融合学会   プラズマ・中性子照射材相互作用研究のための高密度プラズマ照射・試料解析装置の開発

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    Award type:International academic award (Japan or overseas)  Country:Japan

  2. 平成29年度日本学術振興会特別研究員等審査会専門医委員(書面担当)表彰

    2018.7   日本学術振興会  

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    Country:Japan

  3. プラズマ・核融合学会論文賞

    2014.12   プラズマ・核融合学会  

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    Country:Japan

  4. 平成21年度JT-60U共同研究優秀賞

    2011.3   (独)日本原子力研究開発機構  

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    Country:Japan

  5. 第46回燃焼シンポジウムベストプレゼンテーション賞「ダブルプローブ法による大気圧酸素燃焼プラズマの電子特性評価」

    2008.12   日本燃焼学会  

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    Country:Japan

 

Papers 562

  1. Photoelectrochemical properties of plasma-induced nanostructured tungsten oxide Reviewed International coauthorship International journal

    Feng S., Kajita S., Higashi M., Bieberle-Hütter A., Yoshida T., Ohno N.

    Applied Surface Science   Vol. 580   2022.4

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Applied Surface Science  

    Helium (He)-induced nanostructured tungsten sheets were synthesized by He plasma irradiation under different plasma exposure durations. After calcination, nanostructured tungsten oxide samples were used as photoelectrodes to test photoelectrochemical (PEC) performance. The results showed that nanostructured WO3 photoanodes have higher PEC performance compared to the sample without nanostructures. The 15 min irradiated sample had the highest photocurrent density of 3.5 mA/cm2 under the thermodynamic potential of water oxidation (1.23 V vs. RHE). It was found that the oxide layer thickness and exposed crystal facet have a significant impact on PEC performance. The plasma synthesis technique has proved to be an effective method for preparing nanostructured WO3 photoelectrodes.

    DOI: 10.1016/j.apsusc.2021.151979

    Scopus

  2. Nitrogen Atom Density Measurements in NAGDIS-T Using Vacuum Ultraviolet Absorption Spectroscopy Reviewed

    NISHIO Ryosuke, KAJITA Shin, TANAKA Hirohiko, ASAOKA Koji, TSUTSUMI Takayoshi, HORI Masaru, OHNO Noriyasu

    Plasma and Fusion Research   Vol. 17 ( 0 ) page: 1201004 - 1201004   2022.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Plasma Science and Nuclear Fusion Research  

    <p>For the development of a high nitrogen atom density source, we produced nitrogen plasmas and measured the nitrogen atom density using vacuum ultraviolet absorption spectroscopy (VUVAS) at high neutral gas pressure (>1.5 mTorr) and discharge power (>500 W) in the NAGDIS-T, which could generate spiral-shaped dissociative recombining plasmas. It was seen that the nitrogen atom density increases with increasing neutral gas pressure and discharge power, and it reached 6.2 × 10<sup>17 </sup>m<sup>−3</sup>. In the low gas pressure case, the estimated atom density was confirmed to be consistent with that measured by the actinometry method.</p>

    DOI: 10.1585/pfr.17.1201004

    Web of Science

    CiNii Research

  3. Growth of Mo Large-Scale Fiberform Nanostructures Reviewed

    Kajita Shin, Okuyama Tatsuki, Tanaka Hirohiko, Ohno Noriyasu

    PLASMA AND FUSION RESEARCH   Vol. 16 ( 0 ) page: 1206105 - 1206105   2021.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:一般社団法人 プラズマ・核融合学会  

    <p>We performed helium (He) plasma irradiation to molybdenum (Mo) substrate with auxiliary Mo deposition. Different from W cases, large-scale fiberform nanostructure (LFN) growth did not occur easily. The experiments suggested that the experimental condition of Mo LFN growth has a much narrower conditional window than that of fuzz growth or another hidden control factor exists for LFN growth.</p>

    DOI: 10.1585/pfr.16.1206105

    Web of Science

  4. The dependence of Mo ratio on the formation of uniform black silicon by helium plasma irradiation Reviewed International coauthorship

    Shi Quan, Kajita Shin, Feng Shuangyuan, Ohno Noriyasu

    JOURNAL OF PHYSICS D-APPLIED PHYSICS   Vol. 54 ( 40 ) page: 405202   2021.10

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1361-6463/ac1190

    Web of Science

    Scopus

  5. Enhanced photocatalytic ethylene decomposition with anatase-rutile mixed nanostructures formed by He plasma treatment Reviewed

    Kajita S., Miyaguchi K., Tanaka H., Yasunaga E., Yoshida T., Ohno N.

    Journal of Photochemistry and Photobiology A: Chemistry   Vol. 418   page: 113420(8 pp)   2021.9

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jphotochem.2021.113420

    Scopus

  6. Thermal treatment of W large-scale fiberform nanostructures Reviewed

    Kajita Shin, Okuyama Tatsuki, Tanaka Hirohiko, Kuwabara Tatsuya, Ohno Noriyasu, Yoshida Naoaki

    PHYSICA SCRIPTA   Vol. 96 ( 9 )   2021.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1402-4896/ac0866

    Web of Science

    Scopus

  7. Enhancement of Arc Ignition on Tungsten in Helium Plasmas with Impurity Gases Reviewed International coauthorship

    ZHANG Rongshi, KAJITA Shin, HWANGBO Dogyun, TANAKA Hirohiko, OHNO Noriyasu

    Plasma and Fusion Research   Vol. 16 ( 0 ) page: 24045069(5 pp) - 2405069   2021.5

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1585/pfr.16.2405069

    Scopus

  8. Modeling of the impurity-induced silicon nanocone growth by low energy helium plasma irradiation Reviewed International coauthorship

    Q Shi, S Kajita, S Dai, S Feng, N Ohno

    Plasma Science and Technology   Vol. 23 ( 4 ) page: 45503   2021.4

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Plasma Science and Technology  

    DOI: 10.1088/2058-6272/abea71

    Scopus

  9. Influence of Nitrogen Ratio on Plasma Detachment during Combined Seeding with Hydrogen on Divertor Simulation Experiment of GAMMA 10/PDX Reviewed

    GAMO Hiroki, HWANGBO Dogyun, SAKAMOTO Mizuki, PERILLO Renato, KUWABARA Tatsuya, TANAKA Hirohiko, OHNO Noriyasu, SAWADA Keiji, TONEGAWA Akira, MASUZAKI Suguru, EZUMI Naomichi, SUGIYAMA Tsukasa, NOJIRI Kunpei, KONDO Ayane, HIRATA Mafumi, KOHAGURA Junko, YOSHIKAWA Masayuki, NAKASHIMA Yousuke

    Plasma and Fusion Research   Vol. 16 ( 0 ) page: 2402041 - 2402041   2021.3

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    DOI: 10.1585/pfr.16.2402041

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  10. Computer Tomography on Divertor Impurity Monitor for ITER with Miinimizing Errors in a Logarithmic Scale Invited Reviewed International coauthorship

    H.Natsume, S.Kajita, V.S.Neverov, R.I.Khusnutdinov, E.Veshchev, M.DE Rock, A.R.Polevoi, H.Tanaka, N.Ohno, H.Ogawa, S.Kitazawa

    Plasma and Fusion Research   Vol. 16 ( 0 ) page: 2405019 - 2405019   2021.3

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1585/pfr.16.2405019

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  11. Doppler and Stark Broadenings of He II Emission in NAGDIS-PG Invited Reviewed

    S.Kajita, T.Nakamori, H.Tanaka, Y.Kikuchi, N.Ohno

    Plasma and Fusion Research: Rapid Communications   Vol. 16 ( 0 ) page: 1202013 - 1202013   2021.2

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    DOI: 10.1585/pfr.16.1202013

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  12. Analysis of ELM stability with extended MHD models in JET, JT-60U and future JT-60SA tokamak plasmas Reviewed

    Aiba N., Pamela S., Honda M., Urano H., Giroud C., Delabie E., Frassinetti L., Lupelli I., Hayashi N., Huijsmans G.T.A., Litaudon X., Abduallev S., Abhangi M., Abreu P., Afzal M., Aggarwal K.M., Ahlgren T., Ahn J.H., Aho-Mantila L., Airila M., Albanese R., Aldred V., Alegre D., Alessi E., Aleynikov P., Alfier A., Alkseev A., Allinson M., Alper B., Alves E., Ambrosino G., Ambrosino R., Amicucci L., Amosov V., Sundén E.A., Angelone M., Anghel M., Angioni C., Appel L., Appelbee C., Arena P., Ariola M., Arnichand H., Arshad S., Ash A., Ashikawa N., Aslanyan V., Asunta O., Auriemma F., Austin Y., Avotina L., Axton M.D., Ayres C., Bacharis M., Baciero A., Baião D., Bailey S., Baker A., Balboa I., Balden M., Balshaw N., Bament R., Banks J.W., Baranov Y.F., Barnard M.A., Barnes D., Barnes M., Barnsley R., Wiechec A.B., Orte L.B., Baruzzo M., Basiuk V., Bassan M., Bastow R., Batista A., Batistoni P., Baughan R., Bauvir B., Baylor L., Bazylev B., Beal J., Beaumont P.S., Beckers M., Beckett B., Becoulet A., Bekris N., Beldishevski M., Bell K., Belli F., Bellinger M., Belonohy , Ayed N.B., Benterman N.A., Bergsåker H., Bernardo J., Bernert M., Berry M., Bertalot L., Besliu C., Beurskens M.

    Plasma Physics and Controlled Fusion   Vol. 60 ( 1 )   2018.1

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    The stability with respect to a peelingballooning mode (PBM) was investigated numerically with extended MHD simulation codes in JET, JT-60U and future JT-60SA plasmas. The MINERVA-DI code was used to analyze the linear stability, including the effects of rotation and ion diamagnetic drift (w∗i), in JET-ILW and JT-60SA plasmas, and the JOREK code was used to simulate nonlinear dynamics with rotation, viscosity and resistivity in JT-60U plasmas. It was validated quantitatively that the ELM trigger condition in JET-ILW plasmas can be reasonably explained by taking into account both the rotation and w∗i effects in the numerical analysis. When deuterium poloidal rotation is evaluated based on neoclassical theory, an increase in the effective charge of plasma destabilizes the PBM because of an acceleration of rotation and a decrease in w∗i. The difference in the amount of ELM energy loss in JT-60U plasmas rotating in opposite directions was reproduced qualitatively with JOREK. By comparing the ELM affected areas with linear eigenfunctions, it was confirmed that the difference in the linear stability property, due not to the rotation direction but to the plasma density profile, is thought to be responsible for changing the ELM energy loss just after the ELM crash. A predictive study to determine the pedestal profiles in JT-60SA was performed by updating the EPED1 model to include the rotation and w∗i effects in the PBM stability analysis. It was shown that the plasma rotation predicted with the neoclassical toroidal viscosity degrades the pedestal performance by about 10% by destabilizing the PBM, but the pressure pedestal height will be high enough to achieve the target parameters required for the ITER-like shape inductive scenario in JT-60SA.

    DOI: 10.1088/1361-6587/aa8bec

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  13. Development of a Compact Divertor Plasma Simulator for Plasma-Wall Interaction Studies on Neutron-Irradiated Materials Reviewed

    N.Ohno, T.Kuwabara, M.Takagi, R.Nishimura, M.Yajima, A.Sagara, T.Toyama, K.Suzuki, H.Kurishita, T.Shikama, Y.Hatano, N.Yoshida

    Plasma and Fusion Research   Vol. 12 ( 0 ) page: 1405040 - 1405040   2017.10

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1585/pfr.12.1405040

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  14. Development of Divertor Plasma Simulators with High Heat Flux Plasmas and Its Application to Nuclear Fusion Study Reviewed

    大野 哲靖

    IEEJ Transactions 4     page: 476 - 487   2009

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  15. Effects of Ion Flow by E * B Drift on Dust Particle Behavior in Magnetized Cylindrical Electron Cyclotron Resonance Plasmas.

    Nunomura Shota, Ohno Noriyasu, Takamura Shuichi

    Japanese Journal of Applied Physics   Vol. 36 ( 2 ) page: 877 - 883   1997

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    Language:English   Publisher:The Japan Society of Applied Physics  

    Interactions between poloidal ion flow associated with E× B drift and dust particles have been investigated in magnetized cylindrical electron cyclotron resonance plasmas, in which radial electric field is controlled by a biased ring-shaped electrode. The dust particles are spun out and removed from the plasma due to poloidal ion drag force, even when the inward electric force on the dust particles is larger than the gravitational force. This indicates the possibility of using a new method to remove the dust particles from the processing plasma. On the other hand, in order to sustain the dust particles in the plasma, the effects of this poloidal ion flow should be substantially reduced by the friction between the dust particles and neutral gas.

    DOI: 10.1143/jjap.36.877

    CiNii Research

  16. An approach to implement a heat flux limit in a model for fusion relevant plasmas Reviewed International coauthorship

    M.Z.Tokar, M.Kobayashi, N.Ohno

    Physics of Plasmas   Vol. 29   page: 32502   2022.3

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    DOI: 10.1063/5.0079524

  17. Penetration of deuterium into neutron-irradiated tungsten under plasma exposure Reviewed

    Miyuki Yajima, Yuji Hatano, Vladimir Alimov, Takeshi Toyama, Tatsuya Kuwabara, Thomas Schwarz-Selinger, Yasuhisa Oya, Alexander Spitsyn, Noriyasu Ohno

    Physica Scripta   Vol. 96 ( 12 ) page: 124042   2021.10

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing  

    DOI: 10.1088/1402-4896/ac2c20

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    Other Link: https://iopscience.iop.org/article/10.1088/1402-4896/ac2c20/pdf

  18. Particle-in-cell-Monte Carlo collision simulation and experimental measurement of Ar plasma in a fast atom beam source for surface-activated bonding Reviewed International journal

    R.Morisaki, T.Yamazaki, C.Oka, J.Sakurai, T.Hirai, T.Takahashi, H.Tsuji, N.Ohno, S.Hata

    Japanese Journal of Applied Physics   Vol. 60 ( SC ) page: SCCB01   2021.3

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    DOI: 10.35848/1347-4065/abe683

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  19. Fabrication of nanostructured Ti thin film with Ti deposition in He plasmas Reviewed

    Miyaguchi Kazuya, Kajita Shin, Tanaka Hirohiko, Ohno Noriyasu

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 60 ( 3 ) page: 038004(4 pp)   2021.2

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.35848/1347-4065/abe3a5

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  20. Accelerated/reduced growth of tungsten fuzz by deposition of metals Reviewed International coauthorship

    S. Kajita, T. Morgan, H. Tanaka, Y. Hayashi, N. Yoshida, D. Nagata, J. Vernimmen, S. Feng, R. Zhang, N. Ohno

    Journal of Nuclear Materials   Vol. 548   page: 152844   2021.1

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    DOI: 10.1016/j.jnucmat.2021.152844

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  21. Tungsten Large-Scale Fiberform Nanostructures Retained under High Temperature Conditions Reviewed

    T.Okuyama, S.Kajita, N.Yoshida, H.Tanaka, T.Kuwabara, N.Ohno

    PLASMA AND FUSION RESEARCH   Vol. 16   page: 1206001   2021.1

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    DOI: 10.1585/pfr.16.1206001

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  22. Experimental observations and modelling of radiation asymmetries during N<inf>2</inf> seeding in LHD Reviewed International coauthorship

    B.J. Peterson, G.Kawamura, P.L. van de Giessen, K.Mukai, H.Tanaka, R.Sano, S.N. Pandya, S.Y. Dai, S. Masuzaki, T. Akiyama, M. Kobayashi, M. Goto, G. Motojima, R. Sakamoto, N. Ohno, T. Morisaki, J. Miyazawa, the LHD Experiment Group

    Nuclear Materials and Energy   Vol. 26   page: 100848   2020.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.nme.2020.100848

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  23. Unipolar arc plasmas on nanostructured tungsten surfaces under perpendicular magnetic field Reviewed International coauthorship

    D.Hwangbo, D.Nishijima, S.Kajita, R.Doerner, N.Ohno

    PLASMA SOURCES SCIENCE & TECHNOLOGY   Vol. 29 ( 12 ) page: 125015   2020.12

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    DOI: 10.1088/1361-6595/abc817

    Web of Science

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  24. Dynamics of Hydrogen Isotope Absorption and Emission of Neutron-Irradiated Tungsten Reviewed International coauthorship

    T.Toyama, M.Yajima, N.Ohno, T.Kuwabara, V.Kh.Alimov, Y.Hatano

    PLASMA AND FUSION RESEARCH   Vol. 15   page: 150581(7 pp)   2020.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1585/pfr.15.1505081

    Web of Science

  25. Plasma Potential Measurement in Detached Plasmas by Emissive Probe Considering Space-Charge-Limited Effect Reviewed

    S.Hattori, H.Tanka, S.Kajita, N.Ohno

    PLASMA AND FUSION RESEARCH   Vol. 15   page: 1301082(4 pp)   2020.11

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1585/pfr.15.1301082

    Web of Science

  26. Size distribution of nano-tendril bundles with various additional impurity gases Reviewed

    R. Zhang, D. Hwangbo, S. Kajita, H. Tanaka, N. Ohno

    NUCLEAR MATERIALS AND ENERGY   Vol. 25   page: 100843   2020.11

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    DOI: 10.1016/j.nme.2020.100843

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  27. Tungsten fuzz: Deposition effects and influence to fusion devices Reviewed

    S Kajita, N Yoshida, N Ohno

    NUCLEAR MATERIALS AND ENERGY   Vol. 25   page: 100828   2020.11

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    DOI: 10.1016/j.nme.2020.100828

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  28. Cross-field transport in detached helium plasmas in Magnum-PSI Reviewed International coauthorship

    H.Tanaka, Y.Hayashi, S.Kajita, H.J. van der Meiden, M.Yoshikawa, J.W.M.Vernimmen, J.Scholten, I.Classen, T.W.Morgan, N.Ohno

    PLASMA PHYSICS AND CONTROLLED FUSION   Vol. 62 ( 11 ) page: 115021 (14pp)   2020.10

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1361-6587/abb88f

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  29. Nano-tendril bundles behavior under plasma-relevant electric fields Reviewed

    V.V.Kulagin, D.N.Sinelnikov, D.G.Bulgadaryan, N.E.Efimov, V.A.Kurnaev, D.Hwangbo, N.Ohno, S.Kajita

    VACUUM   Vol. 183   page: 109799   2020.10

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    DOI: 10.1016/j.vacuum.2020.109799

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  30. Evaluation of axial decay length of plasma pressure in detached plasma Reviewed

    H.Tanaka, N.Ohno, S.Kajita, H.Takano, S.Hattori, Y.Imaeda

    NUCLEAR MATERIALS AND ENERGY   Vol. 25   page: 100812(5 pp)   2020.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.nme.2020.100812

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  31. Detached helium plasma simulation by a one-dimensional fluid code with detailed collisional-radiative model Reviewed

    H.Tanaka, I.Saeki, N.Ohno, S.Kajita, T.Ido, H. Natsume, A.Hatayama, K.Hoshino, K.Sawada, M.Goto

    PHYSICS OF PLASMAS   Vol. 27 ( 10 ) page: 102505   2020.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/5.0015912

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  32. Dust Formation from Arc Spots on Nanostructured Tungsten Surface Reviewed International coauthorship

    M.Yajima, S.Kajita, N.Ohno, S.Masuzaki, N.Yoshida, D.U.B.Assems, T.W.Morgan, K.Bystrovc, H, van der Meiden

    PLASMA AND FUSION RESEARCH   Vol. 15   page: 1205061(3 pp)   2020.8

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    DOI: 10.1585/pfr.15.1205061

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  33. Atomic nitrogen density measurements by actinometry method in the toroidal device NAGDIS-T Reviewed

    S.Kajita, K.Asaoka, H.Tanaka, R.Nishio, T.Tsutsumi, M.Hori, N.Ohno

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 59 ( 8 ) page: 086002(6 pp)   2020.8

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    DOI: 10.35846/1347-4065/aba456

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  34. Effect of temperature and incident ion energy on nanostructure formation on silicon exposed to helium plasma Reviewed International coauthorship

    M.Thompson, Q.Shi, S.Kajita, N.Ohno, C.Corr

    PLASMA PROCESSES AND POLYMERS   Vol. 17 ( 12 ) page: e2000126(7 pp)   2020.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/ppap.202000126

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  35. Thin film and noble metal loading effects on the photocatalytic reactivity of helium-plasma-induced nanostructured tungsten oxides Reviewed

    S.Feng, S.Kajita, T.Yoshida, N.Ohno, D.Nagata, M.Tokitani

    MATERIALS RESEARCH EXPRESS   Vol. 7   page: 75007   2020.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/2053-1591/aba394

    Web of Science

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  36. The influence of impurities on the formation of nanocone structures on silicon surface irradiated by low energy helium plasma Reviewed

    Q.Shi, S. Kajita, N. Ohno, M.Tokitani, D.Nagata, S. Feng

    JOURNAL OF APPLIED PHYSICS   Vol. 128 ( 2 ) page: 23301   2020.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/5.0010416

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  37. Helium-W co-deposition layer: TEM observation and D retention Reviewed

    S.Kajita, K.Asai, N.Ohno, H. Tanaka, N.Yoshida, D. Nagata, M. Yajima

    JOURNAL OF NUCLEAR MATERIALS   Vol. 540   page: 152350   2020.7

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    DOI: 10.1016/j.jnucmat.2020.152350

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  38. Spatiotemporal dynamics of cross-field ejection events in recombining detached plasma Reviewed

    H.Tanaka, S.Kajita, H.Natsume, I.Saeki, N.Ohno

    PLASMA PHYSICS AND CONTROLLED FUSION   Vol. 62 ( 7 ) page: 075011(10 pp)   2020.6

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    DOI: 10.1088/1361-6587/ab8e19

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  39. Application of dynamic mode decomposition to rotating structures in detached linear plasmas Reviewed

    H.Natsume, H. Tanaka, S. Kajita, N.Ohno

    PHYSICS OF PLASMAS   Vol. 27 ( 4 ) page: 42301   2020.4

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    DOI: 10.1063/1.5134869

    Web of Science

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  40. Modifications of WNOx films by keV D and H ions Reviewed

    N.Matsunami, N.Ohno, M. Tokitani, B. Tsuchiya, M. Sataka, S. Okayasu

    SURFACE & COATINGS TECHNOLOGY   Vol. 394   page: 125798   2020.4

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    DOI: 10.1016/j.surfcoat.2020.125798

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  41. Inspection of Arc Trails Formed in Stellarator/Heliotron Devices W7-X and LHD Reviewed International coauthorship

    Hwangbo Dogyun, Kajita Shin, Dhard Chandra Prakash, Tokitani Masayuki, Krause Marco, Naujoks Dirk, Masuzaki Suguru, Klose Soeren, Ohno Noriyasu

    PLASMA AND FUSION RESEARCH   Vol. 15   page: 2402012   2020.3

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    DOI: 10.1585/pfr.15.2402012

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  42. Helium irradiation effects on the surface modification and recrystallization of tungsten Reviewed International coauthorship

    Khan A, De Temmerman G, Kajita S, Greuner H, Balden M, Hunger K, Ohno N, Hwangbo D, Tomita Y, Tokitani M, Nagata D, Yajima M

    PHYSICA SCRIPTA   Vol. T171 ( 1 ) page: 14050   2020.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1402-4896/ab52c6

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  43. Microstructure and Retention in He-W Co-Deposition Layer Reviewed

    K.Asai, N.Yoshida, N.Ohno, S.Kajita, H.Tanaka, M.Yajima, D.Nagata

    PLASMA AND FUSION RESEARCH   Vol. 15   page: 1201004   2020.2

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    DOI: 10.1585/pfr.15.1201004

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  44. Growth of nano-fibers on HCP-metals by He plasma irradiation Reviewed

    S.Kajita, T.Nojima, Y.Yamamoto, N.Yoshida, T.Okuyama, T.Kuwabara, N.Ohno

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 59 ( SH ) page: SHHA03   2020.2

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    DOI: 10.7567/1347-4065/ab5bbf

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  45. First EMC3-EIRENE modelling of JT-60SA edge plasmas with/without resonant magnetic perturbation field Reviewed International coauthorship

    H.Tanaka, G.Kawamura, K.Hoshino, M.Kobayashi, G.Matsunaga, Y.Suzuki, T.Lunt, Y.Feng, N.Ohno

    CONTRIBUTIONS TO PLASMA PHYSICS   Vol. 60 ( 5-6 ) page: e201900114   2020.2

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    DOI: 10.1002/ctpp.201900114

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  46. Dynamics of the changes in the parameters of the arc plasma during the destruction of a helium-induced tungsten fuzz by arc pulses Reviewed International coauthorship

    S. A.Barengolts , D.Hwangbo , S.Kajita , N.Ohno , V. P.Frolova , A. G.Nikolaev , E. M.Oks , D. L.Shmelev , M. M.Tsventoukh , G. Yu Yushkov

    NUCLEAR FUSION   Vol. 60 ( 4 ) page: 44001   2020.2

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    DOI: 10.1088/1741-4326/ab73c3

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  47. Photocatalytic application of helium plasma induced nanostructured tungsten oxides Reviewed

    S.Feng, S.Kajita, Y.Tomita, T.Yoshida, N.Ohno

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 59 ( SA ) page: SAAB04(6 pp)   2019.11

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    DOI: 10.7567/1347-4065/ab4601

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  48. Helium-plasma–induced straight nanofiber growth on HCP metals Reviewed

    S.Kajita, T.Nojima, T.Okuyama, Y.Yamamoto, N.Yoshida, N.Ohno

    Acta Materialia   Vol. 181   page: 342 - 351   2019.10

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    © 2019 Acta Materialia Inc. Low-energy helium (He) plasma irradiations were conducted on ruthenium (Ru) and rhenium (Re), which have hexagonal close packed (HCP) crystal structures. Growth of linear shaped fiberform nanostructures were identified on the surfaces of the both metals after the He plasma irradiation. We also conducted He plasma irradiation while Re particles were deposited on tungsten substrate; 3-mm-thick large scale fiberform nanostructures were grown on the surface. The crystal orientation was analyzed using diffraction patterns of Re and Ru nanofibers together with detailed transmission electron microscope observations. It was found that the growth of linear nanofibers has a preferential crystal orientation in the growth direction and it is always in the c-direction of the HCP crystals. Potential growth processes and mechanisms are proposed based on the experimental observations.

    DOI: 10.1016/j.actamat.2019.09.053

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  49. Field Emission From Nanostructured Tendril Bundles Reviewed International coauthorship

    D.Sinelnikov, D.Bulgadaryan, D.Hwangbo, S.Kajita, V.Kumaev, N.Ohno

    IEEE TRANSACTIONS ON PLASMA SCIENCE   Vol. 47 ( 11 ) page: 5186 - 5190   2019.10

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    DOI: 10.1109/TPS.2019.2942725

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  50. Kinetics of deuterium penetration into neutron-irradiated tungsten under exposure to high flux deuterium plasma Reviewed

    M. Yajima, Y. Hatano, N. Ohno, T. Kuwabara, T. Toyama, M. Takagi, K. Suzuki

    Nuclear Materials and Energy   Vol. 21   page: 100699   2019.8

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    © 2019 The Authors The objective of this study is to investigate the effects of neutron (n) irradiation on hydrogen isotope transport in tungsten (W). W samples were irradiated with neutrons in a fission reactor and then exposed to high flux deuterium (D) plasma at 563 K in a linear plasma device. The fraction of D release increased with increasing exposure time. In addition, the D retention in n-irradiated W increased in proportion to the square root of the plasma exposure time. These observations were explained by increase in the penetration depth of D with filling up displacement damages acting as strong trapping sites.

    DOI: 10.1016/j.nme.2019.100699

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  51. Application of Ion Sensitive Probe to High Density Plasmas in Magnum-PSI Reviewed International coauthorship

    Y.Hayashi, N.Ohno, H.van der Meiden, J.Scholten, S.Kajita, J.van der Berg, R.Perillo, J.Vernimmen, T.Moragan

    PLASMA AND FUSION RESEARCH   Vol. 14   page: 1202135(3 pp)   2019.7

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    DOI: 10.1585/pfr.14.1202135

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  52. Spatial and temporal measurement of recombining detached plasmas by laser Thomson scattering Reviewed

    S. Kajita, H. Ohshima, H. Tanaka, M. Seki, H. Takano, N. Ohno

    PLASMA SOURCES SCIENCE & TECHNOLOGY   Vol. 28   page: 105015 (9pp)   2019.7

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    DOI: 10.1088/1361-6595/ab318d

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  53. Photocatalytic decomposition of ethylene using He plasma induced nano-TiO<inf>2</inf> Reviewed

    S.Kajita, Y.Tomita, E.Yasunaga, T.Yoshida, K.Miyaguchi, H.Tanaka, N.Ohno

    Japanese Journal of Applied Physics   Vol. 58   page: 070903(4 pp)   2019.6

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    © 2019 The Japan Society of Applied Physics. Ethylene decomposition via photocatalytic reaction using ultra-violet light was performed using an oxidized titanium (Ti) sheet and/or thin film samples fabricated by helium (He) plasmas treatments. We prepared nanostructured Ti samples formed by He plasma irradiation and additional thin film deposited samples using radio frequency magnetron sputtering. The samples prepared in this study had a slightly lower photocatalytic activity compared to the thin film deposited on tungsten nanostructure samples previously reported; the anatase formation was solely identified on Ti sheet samples and is hopeful for further improvement of photocatalytic activity of plasma treated titania.

    DOI: 10.7567/1347-4065/ab2830

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  54. Fabrication of a nanostructured TiO<inf>2</inf> photocatalyst using He plasma-irradiated tungsten and ethylene gas decomposition Reviewed

    Y.Tomita, S.Kajita, E.Yasunaga, T.Yoshida, N.Ohno, H.Tanaka

    Japanese Journal of Applied Physics   Vol. 58 ( SE ) page: SEEG01(6 pp)   2019.5

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    © 2019 The Japan Society of Applied Physics. Decomposition of ethylene gas by a photocatalyst is an environmentally friendly and sustainable process. We fabricated titanium dioxide thin films deposited on nanostructured tungsten substrates formed by exposure to helium plasma and evaluated their photocatalytic performance. The nanostructures were maintained even after sputtering and annealing, and the proportion of tungsten inside the thin film increased with increasing oxidation temperature. The photocatalytic activity was improved due to formation of the nanostructure.

    DOI: 10.7567/1347-4065/ab09c8

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  55. Investigation of recombination front region in detached plasmas in a linear divertor plasma simulator Reviewed International coauthorship

    N.Ohno, M.Seki, H.Ohshima, H.Tanaka, S.Kajita, Y.Hayashi, H.Natsume, H.Takano, I.Saeki, M.Yoshikawa, H.van der Meiden

    Nuclear Materials and Energy   Vol. 19   page: 458 - 462   2019.5

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    We have investigated detailed plasma structure around the recombination front region (RFR), where volume electron-ion recombination (EIR) strongly occurs in detached plasmas, by using two-dimensional (2D) movable probe system as well as laser Thomson scattering diagnostics. The 2D distribution of electron density, electron temperature, and plasma potential around the RFR, has been revealed for the first time. The spatial distribution of the particle loss rate due to EIR estimated from electron temperature and electron density profiles indicated that the three-dimensional structure of the RFR adopts a cone structure. Furthermore, in the peripheral region of the RFR, the radial profile of the electron density was widened locally with increasing cross-field transport caused by plasma fluctuation. From the heat transport analysis of electrons, it was found that the thermal relaxation process between electrons and ions is important for the cooling of electrons, and that the convection of electrons regulates electron heat transport near the RFR.

    DOI: 10.1016/j.nme.2019.03.010

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  56. Generation of Spiral Shape Nitrogen Recombining Plasma for Atomic Nitrogen Source Reviewed

    K. Asaoka, N. Ohno, Y. Hayashi, S. Kajita, and H. Tanaka

    Plasma and Fusion Research   Vol. 14   page: 3401069(4 pp)   2019.4

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    DOI: 10.1585/pfr.14.3401069

  57. Characterization of He induced nanostructures using SEM image analysis Reviewed

    H.Tanaka, S.Kajita, N.Ohno

    Plasma and Fusion Research   Vol. 14 ( Specialissue2 ) page: 3402049(6 pp)   2019.4

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    © 2019 The Japan Society of Plasma Science and Nuclear Fusion Research. Helium induced nanostructures on tungsten were characterized by applying basic statistical analysis techniques to scanning electron microscope (SEM) images. As the analysis targets, pinhole- and fuzz-dominant surfaces irradiated with different ion fluences were employed. Although two-dimensional Fourier analysis of the normalized brightness of SEM images clarified several characteristic features, their differences are small to distinguish the dominant nanostructures. On the other hand, probability density functions (PDFs) of the normalized brightness indicate that hole- and fuzz-dominant surfaces have long tail and Gaussian-like shape, respectively. By using several indexes with considering the black and white saturation, it was found that kurtosis and Kullback- Leibler divergence could provide reasonable judgement as the characterization index.

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  58. Synergistic effect of nitrogen and hydrogen seeding gases on plasma detachment in the GAMMA 10/PDX tandem mirror Reviewed

    N.Ezumi, T.Iijima, M.Sakamoto, Y.Nakashima, M.Hirata, M.Ichimura, R.Ikezoe, T.Imai, T.Kariya, I.Katanuma, J.Kohagura, R.Minami, T.Numakura, M. Yoshikawa, S. Togo, MD S.Islam, MD M.Islam, K.Nojiri, A.Terakado, S.Jang, Y.Kinoshita, T.Mikami, S.Yamashita, T.Yoshimoto, T.Hara, A.Hatayama, K.Ichimura, S.Kado, S.Masuzaki, T.Nakano, N.Ohno, K. Sawada, H. Tanaka, A.Tonegawa and R.Perillo

    Nuclear Fusion   Vol. 59   page: 060030   2019.4

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  59. Ignition and Behavior of Arc Spots on Helium Irradiated Tungsten under Fusion Relevant Condition Reviewed

    S.Kajita, D.Hwangbo, N.Ohno

    IEEE Transactions on Plasma Science   Vol. 47 ( 8 ) page: 3909 - 3916   2019.4

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    © 1973-2012 IEEE. In nuclear fusion reactors, unipolar arcing is a longstanding plasma surface interaction issue. In this paper, short summaries of morphology changes by helium plasma irradiation under fusion relevant conditions and ignition of arcing on the He irradiated surfaces are given. Helium plasma irradiation leads to surface morphology changes, and arcing can be ignited on the surface in response to pulsed heat load accompanied by plasma instabilities. Then, we focused on arcing ignited on large-scale fiberform nanostructures (LFNs) formed with deposition of metallic particles together with helium-ion irradiation. Dusts release from the arc spot and the amount of material erosion are discussed based on the experiments.

    DOI: 10.1109/TPS.2019.2908193

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  60. Analysis of indefinite divertor footprint with proper orthogonal decomposition in hydrogen/deuterium plasmas in LHD Reviewed

    H.Tanaka, S.Masuzaki, G.Kawamura, M.Kobayashi, Y.Suzuki, T.Morisaki, N.Ohno LHD Experimental Group

    Nuclear Materials and Energy   Vol. 19   page: 378 - 383   2019.3

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    DOI: 10.1016/j.nme.2019.03.014

  61. Increased energy absorption into W due to the metal deposited layer from an ELM-like pulsed plasma Reviewed

    T.Nakamori, N.Ohno, H.Tanaka, S.Kajita, Y.Kikuchi, T.Akiyama

    Plasma and Fusion Research   Vol. 14   page: 1401051(5 pp)   2019.3

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    © 2019 The Japan Society of Plasma Science and Nuclear Fusion Research. It is important in divertor physics research to investigate thermal response process of beryllium deposited tungsten to high transient heat load such as ELMs. We investigated the heat load on aluminum-coated tungsten by comparing the measured back surface temperature and calculation results of the one-dimensional heat conduction equation. When the plasma power was low enough so that the evaporation did not occur sufficiently, the heat load on the aluminum-coated tungsten was higher than the virgin tungsten. It was caused by the reduction in the energy reflection coefficient due to the formation of aluminum layer. The results suggested that the beryllium deposited layer adversely affects the heat load on the divertor plate when the heat load was not high such as Grassy-ELM.

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  62. Double-probe measurement in recombining plasma using NAGDIS-II Reviewed

    Y. Hayashi, H. Nishikata, N. Ohno, S. Kajita, H. Tanaka, H. Ohshima, M. Seki

    Contributions to Plasma Physics   Vol. 59 ( 7 ) page: e201800088   2019.2

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    © 2019 WILEY-VCH Verlag GmbH &amp; Co. KGaA, Weinheim We have studied the validity of the double-probe method in recombining plasmas. Electron temperature (Te) measured with a double probe was quantitatively evaluated by taking into account the influences of plasma potential fluctuation, plasma resistivity, and electron density fluctuation on the current–voltage characteristics. Differential potential fluctuation and plasma resistivity between two electrodes have a minor effect on Te especially when the inter-distance is small (typically 1 mm). Scattering of measured Te due to the density fluctuation was sufficiently suppressed by making the data acquisition time long (typically 4 s) and taking the average. There is a good agreement between Te measured with the optimized double-probe method and that with laser Thomson scattering diagnostics.

    DOI: 10.1002/ctpp.201800088

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  63. Development of Thomson scattering measurement system for Upstream plasmas in the NAGDIS-II device Reviewed

    H.Takano, H.Ohshima, S.Kajita, H.Tanaka, N.Ohno

    Plasma and Fusion Research   Vol. 14 ( Specialissue1 ) page: 2405031(4 pp)   2019.2

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    © 2019 The Japan Society of Plasma Science and Nuclear Fusion Research. A new laser Thomson scattering (LTS) measurement system in the upstream region of the linear plasma device NAGDIS-II is established in addition to the recently introduced LTS in the downstream. Further, horizontal distributions of the electron temperature and electron density were compared with those obtained from the Langmuir probe, indicating plasma disturbance due to the insertion of the probe head. We discuss the variation of the electron energy distribution function at upstream and downstream in the recombining plasma.

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  64. Growth of membrane nanostructures on W co-deposition layer Reviewed

    S. Kajita, N. Yoshida, S. Kawaguchi, H. Tanaka, N. Ohno, D. Nagata, M. Tokitani

    Nuclear Materials and Energy   Vol. 18   page: 339 - 344   2019.2

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    © 2019 The Authors Large-scale mm thick fiberform nanostructures are grown when materials are subjected to high flux helium ions with tungsten particles (ions and neutrals) precipitation. Observations of the large-scale fiberform nanostructures (LFNs) were conducted by scanning electron microscope (SEM) and transmission electron microscope (TEM) analyses. In particular, this study focuses on membrane nanostructures. Membranes that contain He bubbles were always observed when LFNs covered the surface. We discuss the growth process of the membrane structures based on detailed observations.

    DOI: 10.1016/j.nme.2019.02.004

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  65. Spatiotemporal Structure of Hα Emission from the Detached Plasma in GAMMA 10/PDX Reviewed

    H.Tanaka, M.Sakamoto, N.Ezumi, A.Terakado, K.Nojiri, T.Mikami, Y.Kinoshita, K.Kobayashi, M.Yoshikawa, J. Kohagura, N.Ohno

    Plasma and Fusion Research: Regular Articles   Vol. 14   page: 2402036(5 pp)   2019.2

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    DOI: 10.1585/pfr.14.2402036

  66. Growth process of nano-tendril bundles with sputtered tungsten Reviewed

    D. Hwangbo, S. Kajita, H. Tanaka, and N. Ohno

    Nuclear Materials and Energy   Vol. 18   page: 250 - 257   2019.1

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    © 2019 The Authors Nano-tendril bundles (NTBs) were generated in DC He plasma with impurity gas-seeding (Ne and N 2 ) under sputtering-dominated conditions. NTB morphologies were characterized using the net erosion yield of samples. NTBs’ height and area were analyzed and ion fluence dependence was discussed. For both impurities, the number of NTBs increased steadily with increasing the fluence. It was revealed that NTB can be generated newly and continuously regardless of ion fluence. Surface observations suggested that micro-protrusions can evolve into NTBs. The effect of re-deposition of W was discussed based on SEM observations. Line-of-sight deposition seemed to play a key role of W feeder to enable NTBs to grow greater.

    DOI: 10.1016/j.nme.2019.01.008

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  67. Multipoint measurements employing a microwave interferometer and a Langmuir probe in the detached linear plasma Reviewed

    H. Natsume, H. Tanaka, S. Kajita, M. Yoshikawa, M. Seki, H. Ohshima, and N. Ohno

    AIP ADVANCES   Vol. 9   page: 015016 (6pp)   2019.1

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    DOI: 10.1063/1.5081929

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  68. Influence of heavier impurity deposition on surface morphology development and sputtering behavior explored in multiple linear plasma devices Reviewed International coauthorship

    D.Nishijima, A.Kreter, M.Baldwin, D.Borodin, A.Eksaeva, D.Hwangbo, S.Kajita, M.Miyamoto, N.Ohno, M.Patino, A.Psopieszczyk, M.Rasinski, T.Schlummer, A.Terra, R.P.Doerner

    NUCLEAR MATERIALS AND ENERGY   Vol. 18   page: 67 - 71   2019.1

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    DOI: 10.1016/j.nme.2018.12.008

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  69. Spatiotemporal Structure of H alpha Emission from the Detached Plasma in GAMMA 10/PDX Reviewed

    H.Tanaka, M.Sakamoto, N.Ezumi, A.Terakado, K.Nojiri, T.Mikami, Y.Kinoshita, K.Kobayashi, M.Yoshikawa, J. Kohagura, N.Ohno

    PLASMA AND FUSION RESEARCH   Vol. 14 ( Specialissue1 ) page: 2402036(5 pp)   2019.1

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    DOI: 10.1585/pfr.14.2402036

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  70. Effect of Damage Introduction and He Existence on D Retention in Tungsten by High Flux D Plasma Exposure Reviewed

    Yasuhisa Oya, Keisuke Azuma, Akihiro Togari, Moeko Nakata, Qilai Zhou, Mingzhong Zhao, Tatsuya Kuwabara, Noriyasu Ohno, Miyuki Yajima, Yuji Hatano, Takeshi Toyama

    Lecture Notes in Networks and Systems   Vol. 53 ( 8 ) page: 89 - 96   2019

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    DOI: 10.1007/978-3-319-99834-3_12

  71. Proton scattering from tungsten fuzz

    D. Bulgadaryan, D. Sinelnikov, V. Kurnaev, S. Kajita, D. Hwangbo, N. Ohno

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   Vol. 434   page: 9 - 12   2018.11

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    © 2018 Elsevier B.V. Tungsten fuzz is a nanostructure formed on tungsten surface under helium plasma impact. In this work, we investigate this structure using the scattering of keV-energy protons. Energy spectra of scattered protons have double-peak shape that corresponds to the scattering from fuzz and underlying pure tungsten. The energy losses of protons in fuzz are estimated as the difference between primary beam energy and the energy corresponding to the local minimum between two peaks. Computer simulations with SRIM code also demonstrate double-peak shape of energy spectra of protons scattered from fuzzy target. Fuzz and pure tungsten stopping powers for protons are compared and fuzz density relative to pure tungsten is estimated and discussed. Evolution of H+energy spectra during fuzz irradiation by Ar+beam is measured and discussed.

    DOI: 10.1016/j.nimb.2018.07.038

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  72. Plasma exhaust and divertor studies in Japan and Europe broader approach, DEMO design activity Reviewed International coauthorship

    N.Asakura, K.Hoshino , H.Utoh, Y.Someya, S.Suzuki, C.Bachmann, H.Reimerdes, R.Wenninger, H.Kudo, S.Tokunaga, Y.Hommai, Y.Sakamoto, R.Hiwatari, K.Tobita, Jeong-Ha You, G.Federici, K.Ezato, Y.Seki, ...N.Ohno

    FUSION ENGINEERING AND DESIGN   Vol. 136   page: 1214 - 1220   2018.11

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    DOI: 10.1016/j.fusengdes.2018.04.104

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  73. Characterized divertor footprint profile modification with the edge pressure gradient in the Large Helical Device Reviewed

    Tanaka H., Masuzaki S., Kawamura G., Kobayashi M., Suzuki Y., Motojima G., Murase T., Morisaki T., Ohno N.

    PLASMA PHYSICS AND CONTROLLED FUSION   Vol. 60 ( 12 ) page: 125001   2018.10

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    DOI: 10.1088/1361-6587/aae2d7

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  74. Morphologies of co-depositing W layer formed during He plasma irradiation Reviewed

    Kajita Shin, Kawaguchi Shota, Yoshida Naoaki, Ohno Noriyasu, Tanaka Hirohiko

    NUCLEAR FUSION   Vol. 58 ( 10 ) page: 106002   2018.10

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    DOI: 10.1088/1741-4326/aad24e

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  75. One-Step Plasma Synthesis of Nb<inf>2</inf>O<inf>5</inf> Nanofibers and their Enhanced Photocatalytic activity Reviewed

    S.Kajita, F.Mimuro, T.Yoshida, N.Ohno, N.Yoshida

    ChemPhysChem   Vol. 19 ( 23 ) page: 3237 - 3246   2018.9

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    © 2018 Wiley-VCH Verlag GmbH &amp; Co. KGaA, Weinheim Fiberform nanostructured niobium (Nb) was fabricated by one step helium (He) plasma irradiation. He ion implantation formed He nano-bubbles on a Nb plate and led to formation of protrusions while migrating in Nb matrix; fiberform nanostructures (FN) were grown when the fluence became high (&gt;1026 m−2). The necessary conditions for the formation of Nb FN were revealed to be the surface temperature range of 900–1100 K and the incident ion energy higher than 70 eV. The sample was oxidized at 573–773 K in an air atmosphere, and Pt nanoparticles were photo-deposited on the Nb2O5 samples. The surface was analyzed by scanning electron microscope, transmission electron microscope, x-ray photoelectron spectroscopy, and ultraviolet-visible spectrophotometry. Photocatalytic activity of the fabricated materials was studied using methylene blue (MB) decolorization process. An enhanced photocatalytic performance was identified on FN Nb2O5 substrate with Pt deposition.

    DOI: 10.1002/cphc.201800769

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  76. Growth of nano-tendril bundles on tungsten with impurity-rich He plasmas Reviewed

    Hwangbo Dogyun, Kajita Shin, Ohno Noriyasu, McCarthy Patrick, Bradley James W, Tanaka Hirohiko

    NUCLEAR FUSION   Vol. 58 ( 9 ) page: 096022   2018.9

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    DOI: 10.1088/1741-4326/aacd1f

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  77. Thomson Scattering Measurement of Two Electron Temperature Components in Transition to Detached Plasmas Reviewed

    Ohshima Hiroshi, Kajita Shin, Tanaka Hirohiko, Ohno Noriyasu, Van der Meiden Hennie J

    PLASMA AND FUSION RESEARCH   Vol. 13   page: 1201099   2018.8

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    DOI: 10.1585/pfr.13.1201099

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  78. Effect of the Nanostructured Layer Thickness on the Dynamics of Cathode Spots on Tungsten Reviewed International coauthorship

    S.A. Barengolts, V.G. Mesyats, M. M. Tsventoukh, S.Kajita, D.Hwangbo, N.Ohno

    IEEE Transactions on Plasma Science   Vol. 46 ( 11 ) page: 4044 - 4050   2018.8

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    IEEE Experimental data on the effect of the thickness of a nanostructured layer present on the surface of a tungsten cathode on its arcing properties have been analyzed. It has been shown that if the nanostructured layer is not completely destroyed as a result of the operation of a cathode spot cell, the spot ``sinks&#039;&#039; in the layer, the spot cells group together, and the trajectory of the spot motion becomes ``entangled.&#039;&#039; To interpret the experimental results, the grouping of arc spot cells was simulated using a random walk model based on the Monte Carlo method into which an attractive force was introduced and assuming that the cell plasma density, i.e., the cell initiation probability, is proportional to 1/r&amp;#x00B2;, where r is the distance between two spot cells. It has been demonstrated that spot cells are entangled, forming a group and moving together when the attractive force between them is strong enough. When this force decreases and the directionality of the cells increases as the cathode spot shifts to a lower thickness region of the nanostructured layer, the velocity of motion of the spot increases and its trace left on the surface becomes narrower.

    DOI: 10.1109/TPS.2018.2859953

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  79. Blob- and hole-like structures outstanding during the transition from attached to detached divertor states in GAMMA 10/PDX Reviewed

    Tanaka, H, Sakamoto, M, Ezumi, N, Nojiri, K, Terakado, A, Mikami, T, Kinoshita, Y, Kobayashi, K, Yoshikawa, M, Kohagura, J, Ohno, N

    PHYSICS OF PLASMAS   Vol. 25 ( 8 ) page: 082505(6 pp)   2018.8

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    DOI: 10.1063/1.5040800

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  80. Localized spiraling plasma ejection contributing the ion-flux broadening in the detached linear plasma Reviewed

    Tanaka, H, Takeyama, K, Yoshikawa, M, Kajita, S, Ohno, N, Hayashi, Y

    PLASMA PHYSICS AND CONTROLLED FUSION   Vol. 60 ( 7 ) page: 075013   2018.7

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    DOI: 10.1088/1361-6587/aac0d8

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  81. Ignition and erosion of materials by arcing in fusion-relevant conditions Reviewed

    Hwangbo Dogyun, Kajita Shin, Barengolts Sergey A, Tsventoukh Mikhail M, Kawaguchi Shota, Mesyats Vadim G, Ohno Noriyasu

    CONTRIBUTIONS TO PLASMA PHYSICS   Vol. 58 ( 6-8 ) page: 608 - 615   2018.7

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    DOI: 10.1002/ctpp.201700157

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  82. Helium line emission spectroscopy in recombining detached plasmas Reviewed

    Shin Kajita, Kensuke Suzuki, Hirohiko Tanaka, Noriyasu Ohno

    Physics of Plasmas   Vol. 25 ( 6 ) page: 063303   2018.6

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    Line emissions from helium (He) plasmas have been used for measurement of electron density and temperature in various situations. We performed measurements of He line intensities in recombining plasmas in a divertor simulator, followed by discussion of some potential difficulties of using the line intensity ratio (LIR) method in a divertor environment under detached conditions. When using four line emissions (501.6, 667.8, 706.5, and 728.1 nm), the discrepancy of the results compared to results from the laser Thomson scattering (LTS) method increased along with increasing gas pressure. However, the LIR method agreed well with LTS when a recombination sensitive line emission (447.1 nm) was added. The influence of the transport of metastable atoms is also discussed. Additionally, anomalous characteristics of the LIR method were revealed in hydrogen helium mixture plasmas when the temperature was in the range of 1-4 eV. These anomalies were likely attributable to the dissociative recombination of HeH+.

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  83. Nanostructure Growth on Rhodium/Ruthenium by the Exposure to He Plasma Reviewed

    Tomohiro NOJIMA, Shin KAJITA, Naoaki YOSHIDA, Shota KAWAGUCHI, Noriyasu OHNO, Hirohiko TANAKA, Masayuki TOKITANI, Daisuke NAGATA, Tsuyoshi AKIYAMA, Takashi YAGI

    Plasma and Fusion Research   Vol. 13   page: 3406064   2018.6

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    DOI: 10.1585/pfr.13.3406065

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  84. Mode Structure Analysis of Detached Plasmas with 2D Images Reviewed

    Kajita Shin, Tanaka Hirohiko, Ohno Noriyasu, Onda Takuya

    PLASMA AND FUSION RESEARCH   Vol. 13   page: 1402033(5 pp)   2018.5

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    DOI: 10.1585/pfr.13.1402033

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  85. Fabrication of photocatalytically active vanadium oxide nanostructures via plasma route Reviewed

    Shin Kajita, Tomoko Yoshida, Noriyasu Ohno, Yusuke Ichino, Naoaki Yoshida

    Journal of Physics D: Applied Physics   Vol. 51 ( 21 ) page: 215201   2018.4

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    Plasma irradiation was used to create nanostructured vanadium oxide with potential commercial and industrial applications. Morphology changes were induced at the nano- and micro-meter scale, accompanied by the growth of helium nanobubbles. Micrometer-sized pillars, cube-shaped nanostructures, and fuzzy fiberform nanostructures were grown on the surface
    the necessary conditions in terms of the incident ion energy and the surface temperature for those morphology changes were revealed. Hydrogen production experiments using a photocatalytic reaction with aqueous methanol solution were conducted on the fabricated samples. Enhanced H2 production was confirmed with the plasma irradiated nanostructured sample that had been oxidized in air atmosphere. Photocatalytically inactive vanadium oxide exhibited a high photocatalytic activity after nanostructurization of the surface by helium plasma irradiation.

    DOI: 10.1088/1361-6463/aabe44

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  86. Fuzzy nanostructure growth on precious metals by He plasma irradiation Reviewed

    Shin Kajita, Tomohiro Nojima, Yudai Tomita, Noriyasu Ohno, Hirohiko Tanaka, Naoaki Yoshida, Miyuki Yajima, Tsuyoshi Akiyama, Masayuki Tokitani, Takashi Yagi

    Surface and Coatings Technology   Vol. 340   page: 86 - 92   2018.4

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    Growth of helium bubbles near the surface of metals leads to various morphology changes when sufficient helium ions are continuously implanted on the surface. In this study, low energy (&lt
    100 eV) helium plasma irradiations to various noble metals were conducted, and consequent surface morphology changes were analyzed. It was found that fiberform nanostructures were formed by the helium plasma irradiation on rhodium and ruthenium thin films, which were deposited by magnetron sputtering, and on platinum and iridium wires. Growth of fiberform structures were not identified on gold, silver, and palladium samples exposed to helium plasmas even though the irradiations were conducted at various surface temperatures, though pinholes were observed on palladium surface. We discussed the relation between the morphology changes and material properties.

    DOI: 10.1016/j.surfcoat.2018.02.026

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  87. Pulsation Effects of Incident Ion Energy on W Fuzz Growth Reviewed

    Kajita Shin, Kawaguchi Shota, Hwangbo Dogyun, Tanaka Hirohiko, Ohno Noriyasu

    PLASMA AND FUSION RESEARCH   Vol. 13   page: 1205001   2018.1

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    DOI: 10.1585/pfr.13.1205001

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  88. Measurement of He neutral temperature in detached plasmas using laser absorption spectroscopy Reviewed

    Aramaki M., Tsujihara T., Kajit S., Tanaka H., Ohno N.

    AIP ADVANCES   Vol. 8 ( 1 ) page: 015308   2018.1

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    DOI: 10.1063/1.4997840

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  89. Enhanced growth of large-scale nanostructures with metallic ion precipitation in helium plasmas Reviewed

    Shin Kajita, Shota Kawaguchi, Noriyasu Ohno, Naoaki Yoshida

    Scientific Reports   Vol. 8   page: 56   2018.1

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    Helium plasma irradiation on metal surfaces leads to the formation of metallic fuzzy nanostructures accompanied by the growth of helium bubbles in metals. The mechanism of the growth process, its impact for fusion devices, and potential application have been explored. Here we show enhanced growth of large-scale fuzz by precipitating additional metallic particles during helium plasma irradiation. The growth rate of the fuzzy structures became orders of magnitude greater than conventional fuzz growth
    in an hour of irradiation, 1 mm-thick visible tungsten and molybdenum fuzzy fur structures covered a tungsten metal substrate. Additional precipitation of metallic ions breaks the bottleneck diffusion process
    moreover, further acceleration in the growth rate could have occurred if the electric sheath shape was influenced by the grown structure and the electric field that formed around the structure started collecting ions.

    DOI: 10.1038/s41598-017-18476-7

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  90. Morphology Changes of Platinum and Tungsten Carbide by He Plasma Irradiation Reviewed

    Tomita Yudai, Kajita Shin, Ohno Noriyasu, Tanaka Hirohiko, Ichino Yusuke

    PLASMA AND FUSION RESEARCH   Vol. 13   page: 3406074   2018

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    DOI: 10.1585/pfr.13.3406074

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  91. Recent progress of divertor simulation research using the GAMMA 10/PDX tandem mirror Reviewed

    Nakashima Y, Ichimura K, Islam M. S, Sakamoto M, Ezumi N, Hirata M, Ichimura M, Ikezoe R, Imai T, Kariya T, Katanuma I, Kohagura J, Minami R, Numakura T, Yoshikawa M, Iijima T, Islam M. M, Nojiri K, Shimizu K, Terakado A, Togo S, Asakura N, Fukumoto M, Hatayama A, Hirooka Y, Kado S, Kubo H, Masuzaki S, Matsuura H, Nakano T, Nagata S, Nishino N, Ohno N, Sagara A, Sawada K, Shoji M, Tonegawa A, Ueda Y

    NUCLEAR FUSION   Vol. 57 ( 11 )   2017.11

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    © 2017 IAEA, Vienna. This paper describes the recent progress in divertor simulation research using the GAMMA 10/PDX tandem mirror towards the development of divertors in fusion reactors. During a plasma flow generation experiment in the end cell of the GAMMA 10/PDX, ICRF heating in the anchor cell successfully extended the particle flux up to 3.3 1023 m2 s-1. Superimposing the short pulse of the ECH also attained a maximum heat flux of ∼30 MW m-2. We have succeeded in achieving and characterizing the detachment of the high-temperature plasma, which is equivalent to the SOL plasma of tokamaks, by using the divertor simulation experimental module (D-module) in the GAMMA 10/PDX end cell, in spite of using a linear device with a short magnetic field line connection length. Various gases (Ar, Xe, Ne and N2) are examined to evaluate the effect of radiation cooling against the plasma flow at the MW m-2 level in the divertor simulation region and the following results are obtained: (i) Xe gas was most effective in the reduction of heat and particle fluxes (1%, 3%, respectively) and has a stronger effect on electron cooling (down to ∼1.6 eV) in the used gas species. (ii) Ne gas was less effective. On the other hand, (iii) N2 gas showed more favorable effects than Ar in the lower pressure range. These results will contribute to the progress in detached plasma operation and in clarifying the radiation cooling mechanism towards the development of future divertors.

    DOI: 10.1088/1741-4326/aa7cb4

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  92. Studies of power exhaust and divertor design for a 1.5 GW-level fusion power DEMO Reviewed

    N.Asakura, K.Hoshino, S.Suzuki, S.Tokunaga, Y.Someya, H.Utoh, H.Kudo, Y.Sakamoto, R.Hiwatari, K.Tobita, K.Shimizu, K.Ezato, Y.Seki, N.Ohno, Y.Ueda, Joint Special Team for DEMO Design

    Nuclear Fusion   Vol. 57   page: 126050(12 pp)   2017.10

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    DOI: 10.1088/1741-4326/aa867a

  93. Plasma Exhaust and Divertor Studies in JA and EU Broader Tokamak Fusion Reactor Approach, DEMO Design Activity Reviewed

    Nobuyuki Asakura, Kazuo Hoshino, Hiroyasu Utoh, Yoji Someya, Satoshi Suzuki, Christian Bachmann, Holger Reimerdes, Hironobu Kudo, Shinsuke Tokunaga, Yuki Homma, Yoshiteru Sakamoto, Ryoji Hiwatari, Ronald Wenninger, Kenji Tobita, Noriyasu Ohno,Gianfranco Federici, Koichiro Ezato, Yohji Seki, Noriyasu Ohno, Yoshio Ueda

        2017.9

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  94. Extension of the operational regime of the LHD towards a deuterium experiment Reviewed

    Takeiri Y., Morisaki T., Osakabe M., Yokoyama M., Sakakibara S., Takahashi H., Nakamura Y., Oishi T., Motojima G., Murakami S., Ito K., Ejiri A., Imagawa S., Inagaki S., Isobe M., Kubo S., Masamune S., Mito T., Murakami I., Nagaoka K., Nagasaki K., Nishimura K., Sakamoto M., Sakamoto R., Shimozuma T., Shinohara K., Sugama H., Watanabe K. Y., Ahn J. W., Akata N., Akiyama T., Ashikawa N., Baldzuhn J., Bando T., Bernard E., Castejon F., Chikaraishi H., Emoto M., Evans T., Ezumi N., Fujii K., Funaba H., Goto M., Goto T., Gradic D., Gunsu Y., Hamaguchi S., Hasegawa H., Hayashi Y., Hidalgo C., Higashiguchi T., Hirooka Y., Hishinuma Y., Horiuchi R., Ichiguchi K., Ida K., Ido T., Igami H., Ikeda K., Ishiguro S., Ishizaki R., Ishizawa A., Ito A., Ito Y., Iwamoto A., Kamio S., Kamiya K., Kaneko O., Kanno R., Kasahara H., Kato D., Kato T., Kawahata K., Kawamura G., Kisaki M., Kitajima S., Ko W. H., Kobayashi M., Kobayashi S., Kobayashi T., Koga K., Kohyama A., Kumazawa R., Lee J. H., Lopez-Bruna D., Makino R., Masuzaki S., Matsumoto Y., Matsuura H., Mitarai O., Miura H., Miyazawa J., Mizuguchi N., Moon C., Morita S., Moritaka T., Mukai K., Muroga T., Muto S., Mutoh T., Nagasaka T., Nagayama Y., Nakajima N., Nakamura Y., Nakanishi H., Nakano H., Nakata M., Narushima Y., Nishijima D., Nishimura A., Nishimura S., Nishitani T., Nishiura M., Nobuta Y., Noto H., Nunami M., Obana T., Ogawa K., Ohdachi S., Ohno M., Ohno N., Ohtani H., Okamoto M., Oya Y., Ozaki T., Peterson B. J., Preynas M., Sagara S., Saito K., Sakaue H., Sanpei A., Satake S., Sato M., Saze T., Schmitz O., Seki R., Seki T., Sharov I., Shimizu A., Shiratani M., Shoji M., Skinner C., Soga R., Stange T., Suzuki C., Suzuki Y., Takada S., Takahata K., Takayama A., Takayama S., Takemura Y., Takeuchi Y., Tamura H., Tamura N., Tanaka H., Tanaka K., Tanaka M., Tanaka T., Tanaka Y., Toda S., Todo Y., Toi K., Toida M., Tokitani M., Tokuzawa T., Tsuchiya H., Tsujimura T., Tsumori K., Usami S., Velasco J. L., Wang H., Watanabe T. -H., Watanabe T., Yagi J., Yajima M., Yamada H., Yamada I., Yamagishi O., Yamaguchi N., Yamamoto Y., Yanagi N., Yasuhara R., Yatsuka E., Yoshida N., Yoshinuma M., Yoshimura S., Yoshimura Y.

    NUCLEAR FUSION   Vol. 57 ( 10 )   2017.8

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    DOI: 10.1088/1741-4326/aa7fc2

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  95. Erosion of nanostructured tungsten by laser ablation, sputtering and arcing Reviewed

    Dogyun Hwangbo, Shota Kawaguchi, Shin Kajita, Noriyasu Ohno

    Nuclear Materials and Energy   Vol. 12   page: 386 - 391   2017.8

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    Mass loss of nanostructured tungsten, which was formed by helium plasma irradiation, due to laser ablation, sputtering, and arcing was investigated. Below the helium sputtering energy threshold (&lt
    117 eV), sputtering by impurity gases such as nitrogen and oxygen was dominant. Sputtering yield became closer to theoretical value with increasing the incident ion energy, and sputtering by helium ions became the major contribution when the energy was &gt
    200 eV. Reduction in sputtering on nanostructured surface was observed. Arcing was initiated using laser pulses, and the erosion rate by arcing was measured. The erosion rate increased with arc current, while the erosion per Coulomb was not affected by arc current.

    DOI: 10.1016/j.nme.2017.03.004

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  96. Measuring temperature effects on nano-bubble growth in tungsten with grazing incidence small angle X-ray scattering Reviewed

    Matt Thompson, Russ Doerner, Noriyasu Ohno, Nigel Kirby, Patrick Kluth, Daniel Riley, Cormac Corr

    Nuclear Materials and Energy   Vol. 12   page: 1294 - 1297   2017.8

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    W samples were exposed to He plasma in the MAGPIE, NAGDIS-II and PISCES-A across a range of sample temperatures between 473–1123 K. GISAXS was used to quantify the effect of plasma fluence and W surface temperature on He nano-bubble size distributions. In NAGDIS-II at 873 K nano-bubbles are exponentially distributed with mean diameters μ=0.64±0.01nm, similar to the value of μ=0.62±0.01nmfound for the MAGPIE plasma device at the much lower temperature of 473 K. Above ∼900 K nano-bubbles followed an approximately exponential distribution with μ &gt
    0.72 nm demonstrating a significant increase in nano-bubble sizes at higher temperatures.

    DOI: 10.1016/j.nme.2016.11.025

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  97. A Particle-In-Cell approach to particle flux shaping with a surface mask Reviewed

    Kawamura G, Ohno N, Takamura S, Tomita Y

    NUCLEAR MATERIALS AND ENERGY   Vol. 12   page: 297 - 301   2017.8

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    DOI: 10.1016/j.nme.2016.12.017

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  98. Toroidally symmetric/asymmetric effect on the divertor flux due to neon/nitrogen seeding in LHD Reviewed

    H. Tanaka, G. Kawamura, S. Masuzaki, M. Kobayashi, T. Akiyama, B.J. Peterson, K. Mukai, R. Sano, S.Y. Dai, R. Sakamoto, T. Morisaki, N. Ohno, LHD Experiment Group

    Nucl. Mater. Energy   Vol. 12   page: 241 - 246   2017.8

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    DOI: 10.1016/j.nme.2016.12.020

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  99. Molecular activated recombination in divertor simulation plasma on GAMMA 10/PDX Reviewed

    Sakamoto M, Terakado A, Nojiri K, Ezumi N, Nakashima Y, Sawada K, Ichimura K, Fukumoto M, Oki K, Shimizu K, Ohno N, Masuzaki S, Togo S, Kohagura J, Yoshikawa M

    NUCLEAR MATERIALS AND ENERGY   Vol. 12   page: 1004 - 1009   2017.8

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    DOI: 10.1016/j.nme.2017.05.001

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  100. Fractality and growth of He bubbles in metals Reviewed

    Shin Kajita, Atsushi M. Ito, Noriyasu Ohno

    PHYSICS LETTERS A   Vol. 381 ( 29 ) page: 2355 - 2362   2017.8

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    Pinholes are formed on surfaces of metals by the exposure to helium plasmas, and they are regarded as the initial process of the growth of fuzzy nanostructures. In this study, number density of the pinholes is investigated in detail from the scanning electron microscope (SEM) micrographs of tungsten and tantalum exposed to the helium plasmas. A power law relation was identified between the number density and the size of pinholes. From the slope and the region where the power law was satisfied, the fractal dimension D and s(min), which characterize the SEM images, are deduced. Parametric dependences and material dependence of D and s(min) are revealed. To explain the fractality, simple Monte-Carlo simulations including random walks of He atoms and absorption on bubble was introduced. It is shown that the initial position of the random walk is one of the key factors to deduce the fractality. The results indicated that new nucleations of bubbles are necessary to reproduce the number-density distribution of bubbles. (C) 2017 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physleta.2017.05.028

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  101. Field Emission From Metal Surfaces Irradiated With Helium Plasmas Reviewed International coauthorship

    Dogyun Hwangbo, Shin Kajita, Noriyasu Ohno, Dmitry Sinelnikov

    IEEE TRANSACTIONS ON PLASMA SCIENCE   Vol. 45 ( 8 ) page: 2080 - 2086   2017.8

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    Field electron emission from metal (tungsten, molybdenum, and tantalum) surfaces with different surface morphology was measured. Fuzz and loop samples had small increment in the emission current, whereas bubble samples marked huge increment in the current, accompanied by breakdown. The emission current became greater on the fuzzy samples than the loop samples probably because of more elongated morphology of fuzzy fiber. Among the materials, molybdenum had the lowest current. From Fowler-Nordheim plot analysis, it was revealed that fuzz samples had higher field enhancement factor than loop samples. Bubble samples marked the highest value in the field enhancement factor among the three types of morphology, likely due to the continuous emission from the craters formed after the breakdown. Molybdenum showed favorable properties in terms of suppressing the field emission and preventing the breakdown and the arcing in fusion reactor. From the scanning electron microscope observation, the size of the crater increases with the emission current on the bubble samples. Fuzzy structure was observed at the crater on the tantalum bubble surface after breakdown even without stationary plasma irradiation or stationary incidence of ion flux.

    DOI: 10.1109/TPS.2017.2679211

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  102. Effects of modified surfaces produced at plasma-facing surface on hydrogen release behavior in the LHD Reviewed

    Nobuta Y, Masuzaki S, Tokitani M, Ashikawa N, Nagata D, Yoshida N, Oya Y, Yajima M, Motojima G, Kasahara H, Miyamoto M, Ohno N, Yamauchi Y

    NUCLEAR MATERIALS AND ENERGY   Vol. 12   page: 483 - 487   2017.8

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    DOI: 10.1016/j.nme.2017.02.025

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  103. Behavior of 23S metastable state He atoms in low-temperature recombining plasmas Reviewed

    S.Kajita, T.Tsujihara, M.Aramaki, H.van der Meiden, H.Oshima, N.Ohno, H.Tanaka, R.Yasuhara, T.Akiyama, K.Fujii, T.Shikama

    Physics of Plasmas   Vol. 24   page: 073301(8 pp)   2017.6

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    DOI: 10.1063/1.4990077

  104. Influence of expanding and contracting magnetic field configurations on detached plasma formation in a linear plasma device Reviewed

    Y.Hayashi, N.Ohno, S.Kajita, H.Tanaka

    Physics of Plasmas   Vol. 24   page: 062509(8 pp)   2017.6

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    DOI: 10.1063/1.4986100

  105. Measurement of Poloidal Flow Profiles Using a Mach Probe Array in HYBTOK-II Tokamak with RMP Fields Reviewed

    Okamoto Masaaki, Sakakibara Satoru, Yoshimoto Naoya, Ohno Takuya, Ohno Noriyasu

    PLASMA AND FUSION RESEARCH   Vol. 12   page: 1202027   2017.6

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    DOI: 10.1585/pfr.12.1202027

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  106. Observations of sustained phase shifted magnetic islands from externally imposed m/n=1/1 RMP in LHD Reviewed International coauthorship

    Narushima Y., Sakakibara S., Suzuki Y., Watanabe K. Y., Ohdachi S., Takemura Y., Yoshinuma M., Ida K., Castejon F., Lopez-Bruna D., Hegna C. C., Kobayashi M., Tanaka H., Akiyama T., Ohno N.

    NUCLEAR FUSION   Vol. 57 ( 7 ) page: 076024   2017.5

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    DOI: 10.1088/1741-4326/aa6dce

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  107. Molecular activated recombination in divertor simulation plasma on GAMMA 10/PDX Reviewed

    M.Sakamoto, A.Terakado, K.Nojiri, N.Ezumi, Y.Nakashima, K.Sawada, Ichimura, M.Fukumoto, N.Ohno, S.Masuzaki, S.Togo, Kohagura, M.Yoshikawa

    Nuclear Materials and Energy   Vol. 12   page: 1004-1009   2017.5

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  108. Increase in the energy absorption of pulsed plasma by the formation of tungsten nanostructure Reviewed

    D. Sato, N. Ohno, F. Domon, S. Kajita, Y. Kikuchi, I. Sakuma

    Nuclear Fusion   Vol. 57 ( 6 ) page: 066028(8 pp)   2017.4

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    © 2017 IAEA, Vienna. The synergistic effects of steady-state and pulsed plasma irradiation to material have been investigated in the device NAGDIS-PG (Nagoya DIvertor Simulator with Plasma Gun). The duration of the pulsed plasma was ∼0.25 ms. To investigate the pulsed plasma heat load on the materials, we developed a temperature measurement system using radiation from the sample in a high time resolution. The heat deposited in response to the transient plasma on a tungsten surface was revealed by using this system. When the nanostructures were formed by helium plasma irradiation, the temperature increase on the bulk sample was enhanced. The result suggested that the amount of absorbed energy on the surface was increased by the formation of nanostructures. The possible mechanisms causing the phenomena are discussed with the calculation of a sample temperature in response to the transient heat load.

    DOI: 10.1088/1741-4326/aa67ad

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  109. Tailoring of fuzzy nanostructures on porous tungsten skeleton by helium plasma irradiation Reviewed

    Shin Kajita, Hirohiko Tanaka, Noriyasu Ohno

    Japanese Journal of Applied Physics   Vol. 56 ( 3 ) page: 030303(4 pp)   2017.3

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    Porous tungsten skeleton, which was fabricated by sintering of tungsten powder, was exposed to helium plasmas, and the fuzzy nanostructures were tailored on the surface. The hemispherical optical reflectance of the samples was measured at the wavelength of 633 nm. It was shown that the optical reflectance of the porous tungsten skeleton was lower than that of flat tungsten samples. The minimum reflectance was &gt
    0.4%, suggesting that the darkest metallic material was fabricated. The advantage of the porous tungsten skeleton with nanostructures for optical application is discussed.

    DOI: 10.7567/JJAP.56.030303

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  110. Plasma detachment in linear devices Reviewed

    Ohno N.

    PLASMA PHYSICS AND CONTROLLED FUSION   Vol. 59 ( 3 ) page: 034007(9 pp)   2017.3

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    DOI: 10.1088/1361-6587/aa5394

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  111. Localized density fluctuation in the downstream of detached plasma Reviewed

    Kohei Takeyama, Noriyasu Ohno, Masayuki Yoshikawa, Hirohiko Tanaka, Shin Kajita

    Plasma and Fusion Research   Vol. 12 ( 1 ) page: 1202007   2017.2

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    The density fluctuation was measured with a 70-GHz microwave interferometry system in the linear divertor plasma simulator NAGDIS-II while changing from the attached to the detached states. In the detached plasma, a large amplitude fluctuation of ≤ 10 kHz appeared in the peripheral region. The fluctuation has a maximum value at the neutral gas pressure of 30 - 34 mTorr. Further, the measurement of the light emission associated with the plasma recombination indicates that the large amplitude fluctuation is located at just downstream of the recombination front, in which the recombination process is the most enhanced.

    DOI: 10.1585/pfr.12.1202007

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  112. Transverse motion of a plasma column in a sheet plasma Reviewed

    Takuya Onda, Shin Kajita, Takaaki Iijima, Akira Tonegawa, Noriyasu Ohno, Hirohiko Tanaka

    CONTRIBUTIONS TO PLASMA PHYSICS   Vol. 57 ( 2 ) page: 87 - 93   2017.2

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    In this paper, we show the dynamic behaviors of a sheet plasma and the corresponding release of blob-like plasmas to the periphery of the sheet based on observation with a high-speed camera. We found that the plasma column moves in a transverse direction reciprocally when injecting a small amount of Ar gas to the He plasma from the plasma source region. The motion continued periodically at a frequency of similar to 5 kHz. The frequency of the plasma column motion decreased with increasing Ar gas flow rate and increasing magnetic field. The mechanism of the transverse motion is discussed. Furthermore, in response to the reciprocating motion, release of a blob-like plasma was observed. The differences in the behavior of the released plasma compared with the other linear devices are discussed.

    DOI: 10.1002/ctpp.201500142

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  113. In Situ TEM Observation of Helium Bubbles Collapsing on Nanostructured Tungsten during Annealing Reviewed

    M. Yajima, N. Yoshida, S. Kajita, and N. Ohno

    Plasma and Fusion Research   Vol. 11   page: 1206125   2016.12

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    DOI: 10.1585/pfr.11.1206125

  114. Measurement of heat diffusion across fuzzy tungsten layer Reviewed

    S.Kajita, T.Yagi, K.Kobayashi, M.Tokitani, N.Ohno

    Results in Physics   Vol. 6   page: 877-878   2016.11

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  115. Enhancement of photocatalytic activity of TiO2 by plasma irradiation Reviewed

    S.Kajita, T.Yoshida, N.Ohno, T.Ishida, D.Kitaoka

    Japanese Journal of Applied Physics   Vol. 55   page: 106202(5 pp)   2016.9

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  116. Plasma detachment study of high density helium plasmas in the Pilot-PSI device Reviewed

    Y.Hayashi, K.Jesko, H.J.van der Meiden, J.W.M.Vernimmen, T.W.Morgan, N.Ohno, S.Kajita, M.Yoshikawa, S.Masuzaki

    Nuclear Fusion   Vol. 56   page: 126006(13 pp)   2016.9

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  117. Fuzzy nanostructure growth on Ta/Fe by He plasma irradiation Reviewed

    S.Kajita, T.Ishida, N.Ohno, D.Hwangbo, T.Yoshida

    Scientific Reports   Vol. 6   page: 30380   2016.7

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    DOI: 10.1038/srep30380

  118. Statistical Analysis of Particle Flux Flowing into the End-Target in between Atached and Detached Sttes in the Linear Divertor Plasma Simulator NAGDIS-II Reviewed

    H.Tanaka, N.Ohno, T.Onda, K.Takeyama, S.Kajita, T.Kuwabara, Y.Tsuji

    Contrib. Plasma Phys.   Vol. 56 ( 6-8 ) page: 723-728   2016.6

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  119. Measurement of thermophysical property of plasma forming tungsten nanofiber layer Reviewed

    S.Kajita, T.Yagi, K.Kobayashi, M.Tokitani, N.Ohno

    Japanese Journal of Applied Physics   Vol. 55   page: 056203(5 pp)   2016.4

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    DOI: 10.7567/JJAP.55.056203

  120. Dynamics of three-dimensional radiative structures during RMP assisted detached plasmas on the large helical device and its comparison with EMC3-EIRENE modeling Reviewed International coauthorship

    Shwetang N. Pandya, Byron J. Peterson, Masahiro Kobayashi, Katsumi Ida, Kiyofumi Mukai, Ryuichi Sano, Junichi Miyazawa, Hirohiko Tanaka, Suguru Masuzaki, Tsuyoshi Akiyama, Gen Motojima, Noriyasu Ohno

    NUCLEAR FUSION   Vol. 56 ( 4 ) page: 046002   2016.3

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    The resonant magnetic perturbation (RMP) island introduced in the stochastic edge of the large helical device (LHD) plasma plays an important role in the stabilization of the plasma detachment (Kobayashi et al 2013 Nucl. Fusion 53 093032). The plasma enters in the sustained detachment phase in the presence of an RMP once the line averaged density exceeds a critical value with a given input power. During detachment the enhanced radiation from the stochastic edge of the LHD undergoes several spatiotemporal changes which are studied quantitatively by an infrared imaging video bolometer (IRVB) diagnostic. The experimental results are compared qualitatively and quantitatively with the radiation predicted by the 3D transport simulation with fluid model, EMC3-EIRENE. A fair amount of qualitative agreement, before and after the detachment, is reported. The issue of overestimated radiation from the model is addressed by changing the free parameters in the EMC3-EIRENE code till the total radiation and the radiation profiles match closely, within a factor of two with the experimental observations. A better quantitative match between the model and the experiment is achieved at higher cross-field impurity diffusion coefficient and lower sputtering coefficient after the detachment. In this article a comparison, the first of its kind, is established between the quantified radiation from the experiments and the synthetic image obtained from the simulation code. This exercise is aimed towards validating the model assumptions against the experimentally measured radiation.

    DOI: 10.1088/0029-5515/56/4/046002

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  121. Strong Reduction of Ion Flux to a Target Plate in a Magnetically Contracting Detached Plasma Reviewed

    Y.Hayashi, H.Nishikata, N.Ohno, S.Kajita

    Plasma and Fusion Research: Rapid Communications   Vol. 11   page: 1202005(2 pp)   2016.2

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    DOI: 10.1585/pfr.11.1202005

  122. Plasma flow in peripheral region of detached plasma in linear plasma device Reviewed

    Y.Hayashi, N.Ohno, S.Kajita, H.Tanaka

    Physics of Plasmas   Vol. 23   page: 012511(7 pp)   2016.1

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    DOI: 10.1063/1.4940310

  123. Arc tracks on nanostructured surfaces after microbreakdowns Reviewed

    D.Sinelnikov, D.Bulgadaryan, D.Hwangbo, S.Kajita, D.Kolodko, V.Kurnaev, N.Ohno

    Journal of Physics:Conference Series   Vol. 748   page: 012012(6 pp)   2016

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  124. Detailed Analysis of Plasma Resistivity in Detached Recombining Plasmas Reviewed

    H.Nishikata, Y.Hayashi, N.Ohno, S.Kajita, T.Kuwabara

    Contrib. Plasma Phys.   Vol. 56 ( 6-8 ) page: 717-722   2016

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  125. Modeling of Linear Divertor Plasma Simulator Experiments with Three-dimensional Target Structure by Using EMC3-EIRENE Code Reviewed

    T.Kubawara, H.Tanaka, G.Kawamura, N.Ohno, H.Nishikata, M.Kobayashi, Y.Feng

    Contrib. Plasma Phys.   Vol. 56 ( 6-8 ) page: 598-603   2016

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  126. Effects of Modified Surfaces Produced at Plasma-Facing Surface on Hydrogen Isotopes and Helium Release Behavior in the LHD Reviewed

    Y.Nobuta, S.Masuzaki, M.Tokitani, D.Nagata, N.Ashikawa, N.Yoshida, Y.Oya, M.Yajima, G.Motojima, H.Kasahara, M.Miyamoto, N.Ohno

    IAEA proccedings     page: MPT/P5-19(9 pp)   2016

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  127. Photon Trapping Effects in DEMO Divertor Plasma Reviewed

    K. Hoshino, K. Sawada, R. Idei, S. Tokunaga, N. Asakura, K. Shimizu, and N. Ohno

    Contrib. Plasma Phys.   Vol. 56   page: 657-662   2016

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  128. Investigation of arcing on fiber-formed nanostructured tungsten by pulsed plasma during steady state plasma irradiation Reviewed

    M. Yajima, N. Ohno, S. Kajita, G. De Temmerman, K. Bystrov, S. Bardin

    Fusion Engineering and Design   Vol. 112   page: 156-161   2016

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  129. Morphology and optical property changes of nanostructured tungsten in LHD Reviewed

    S.Kajita, T.Akiyama, N.Yoshida, M.Tokitani, M.Yajima, N.Ohno

    Plasma and Fusion Research   Vol. 10   page: 1402083(9 pp)   2015.12

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    DOI: 10.1585/pfr.10.1402083

  130. Sulfur K-edge XANES for methylene blue in photocatalytic reaction over WO<inf>3</inf> nanomaterials Reviewed International journal

    K. Komori, T. Yoshida, T. Nomoto, M. Yamamoto, C. Tsukada, S. Yagi, M. Yajima, S. Kajita, N. Ohno

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   Vol. 365   page: 35 - 38   2015.12

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms  

    DOI: 10.1016/j.nimb.2015.07.035

    Scopus

  131. Increase in the work function of W/WO3 by helium plasma irradiation Reviewed

    S.Kajita, A.Ohta, T.Ishida, K.Makihara, T.Yoshida, N.Ohno

    Japanese Journal of Applied Physics   Vol. 54   page: 126201(6 pp)   2015.11

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  132. 3D effects of edge magnetic field configuration on divertor/scrape-off layer transport and optimization possibilities for a future reactor Reviewed International coauthorship International journal

    M. Kobayashi, Y. Xu, K. Ida, Y. Corre, Y. Feng, O. Schmitz, H. Frerichs, F. L. Tabares, T. E. Evans, J. W. Coenen, Y. Liang, A. Bader, K. Itoh, H. Yamada, Ph Ghendrih, G. Ciraolo, D. Tafalla, A. Lopez-Fraguas, H. Y. Guo, Z. Y. Cui, D. Reiter, N. Asakura, U. Wenzel, S. Morita, N. Ohno, B. J. Peterson, S. Masuzaki

    Nuclear Fusion   Vol. 55 ( 10 ) page: 104021   2015.9

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    © 2015 IAEA, Vienna. This paper assesses the three-dimensional (3D) effects of the edge magnetic field structure on divertor/scrape-off layer transport, based on an inter-machine comparison of experimental data and on the recent progress of 3D edge transport simulation. The 3D effects are elucidated as a consequence of competition between transports parallel () and perpendicular () to the magnetic field, in open field lines cut by divertor plates, or in magnetic islands. The competition has strong impacts on divertor functions, such as determination of the divertor density regime, impurity screening and detachment control. The effects of magnetic perturbation on the edge electric field and turbulent transport are also discussed. Parameterization to measure the 3D effects on the edge transport is attempted for the individual divertor functions. Based on the suggested key parameters, an operation domain of the 3D divertor configuration is discussed for future devices.

    DOI: 10.1088/0029-5515/55/10/104021

    Scopus

  133. Initiation of arcing on tungsten surface exposed to steady state He Plasmas Reviewed

    S.Kajita, Y.Noiri, N.Ohno

    Physica Scripta   Vol. 90 ( 9 ) page: 095604(7 pp)   2015.8

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    DOI: 10.1088/0031-8949/90/9/095604

  134. Development of Impurity Seeding and Radiation Enhancement in the Helical Divertor of LHD Reviewed

    K.Mukai, S.Masuzaki, B.Peterson, T.Akiyama, M.Kobayashi, H.Tanaka, S.Pandya, R.Sano, G.Motojima, N.Ohno, T.Morisaki, C.Suzuki, I.Murakami, J.Miyazawa, N.Tamura, S.Yoshimura, I.Yamada, R.Yasuhara, H.Funaba, K.Tanaka

    Nuclear Fusion   Vol. 55   page: 83016(9 pp)   2015.7

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    DOI: 10.1088/0029-5515/55/8/083016

  135. Overview of transport and MHD stability study:focusing on the impact of magnetic field topology in the Large Helical Device Reviewed

    K. Ida, K. Nagaoka, S. Inagaki, H. Kasahara, T. Evans, M. Yoshinuma, K. Kamiya, S. Ohdach, M. Osakabe, M. Kobayashi, S. Sudo1,, K. Itoh, T. Akiyama, M. Emoto, A. Dinklage, X. Du, K. Fujii, M. Goto, T. Goto, M. Hasuo, C. Hidalgo, K. Ichiguchi, A. Ishizawa, M. Jakubowski, G. Kawamura, D. Kato, S. Morita, K. Mukai, I. Murakami, S. Murakami, Y. Narushima, M. Nunami, N. Ohno, N. Pablant, S. Sakakibara, T. Seki, T. Shimozuma, M. Shoji, K. Tanaka, T. Tokuzawa, Y. Todo, H. Wang, M. Yokoyama, H. Yamada, Y. Takeiri, T. Mutoh, S. Imagawa, T. Mito, Y. Nagayama, K.Y. Watanabe, N. Ashikawa, H. Chikaraishi, A. Ejiri, M. Furukawa, T. Fujita, S. Hamaguchi, H. Igami1, M. Isobe, S. Masuzaki, T. Morisaki, G. Motojima, K. Nagasaki, H. Nakano, Y. Oya, C. Suzuki, Y. Suzuki, R. Sakamoto, M. Sakamoto, A. Sanpei, H. Takahashi, H. Tsuchiya, M. Tokitani, Y. Ueda, Y. Yoshimura1, S. Yamamoto, K. Nishimura, H. Sugama, T. Yamamoto, H. Idei, A. Isayama, S. Kitajima, S. Masamune, K. Shinohara, P.S. Bawankar, E. Bernard, M. von Berke, H. Funaba, X.L. Huang, T. Ii, T. Ido, K. Ikeda, S. Kamio, R. Kumazawa, T. Kobayashi, C. Moon, S. Muto, J. Miyazawa, T. Ming, Y. Nakamura, S. Nishimura, K. Ogawa, T. Ozaki, T. Oishi, M. Ohno, S. Pandya, A. Shimizu, R. Seki, R. Sano, K. Saito, H. Sakaue, Y. Takemura, K. Tsumori, N. Tamura, H. Tanaka, K. Toi, B. Wieland, I. Yamada, R. Yasuhara, H. Zhang2, O. Kaneko, A. Komori and Collaborators

    Nuclear Fusion   Vol. 55 ( 10 ) page: 104018   2015.7

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    DOI: 10.1088/0029-5515/55/10/104018

  136. Sulfur E-edge XANES for methylene blue in photocatalytic reaction over WO3 nanomaterials Reviewed

    K.Komori, T.Yoshida, T.Nomoto, M.Yamamoto, C.Tsukada, S.Yagi, M.Yajima, S.Kajita, N.Ohno

    Nuclear Instruments and Methods in Physics Research B   Vol. 365   page: 35-38   2015.7

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  137. Molecular dynamics and Monte Carlo hybrid simulation for fuzzy tungsten nanostructure formation Reviewed

    A.M.Ito, A.Takayama, Y.Oda, T.Tamura, R.Kobayashi, T.Hattori, S.Ogata, N.Ohno, S.Kajita, M.Yajima, Y.Noiri, Y.Yoshimoto, S.Saito, S.Takamura, T.Murashima, M.Miyamoto, H.Nakamura

    Nuclear Fusion   Vol. 55 ( 7 ) page: 073013   2015.6

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    DOI: 10.1088/0029-5515/55/7/073013

  138. Growth of multifractal tungsten nanostructure by He bubble induced directional swelling Reviewed

    S.Kajita, N.Yoshida, N.Ohno, Y.Tsuji

    New Journal of Physics   Vol. 17   page: 043038(14 pp)   2015.4

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  139. Influence of Deuterium Retention on Secondary Electron Emission from Graphite under Deuterium Plasma Exposure Reviewed

    T.Kaneko, N.Ohno, Y.Nakamura, M.Yamagiwa, N.Matsunami, S.Kajita, M.Takagi

    Plasma and Fusion Research: Regular Articles   Vol. 10   page: 1402009(5 pp)   2015.3

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  140. Nanostructure growth by helium plasma irradiation to tungsten in sputtering regime Reviewed

    Y.Noiri, S.Kajita, N.Ohno

    Journal of Nuclear Materials   Vol. 463 ( C ) page: 285 - 288   2015.1

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    DOI: 10.1016/j/jnucmat.2015.01.036

  141. Flow damping due to stochastization of the magnetic field Reviewed

    K.Ida, M.Yoshinuma, H.Tsuchiya, T.Kobayashi, C.Suzuki, M.Yokoyama, A.Shimizu, K.Nagaoka, S.Inagaki, K.Itoh & the LHD Experiment Group (36th author)

    Nature Communications     2015.1

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    DOI: 10.1038/ncomms6816

  142. Hybrid simulation research on formation mechanism of tungsten nanostructure induced by helium plasma irradiation Reviewed

    A.M. Ito, A.Takayama, Y.Oda, T.Tamura, R.Kobayashi, T.Hattori, S.Ogata, N.Ohno, S.Kajita, M.Yajima, Y.Noiri, Y.Yoshimoto, S.Saito, S.Takamura, T.Murashima, M.Miyamoto, H.Nakamura

    Journal of Nuclear Materials   Vol. 463   page: 109 - 115   2015.1

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    DOI: 10.1016/j.jnucmat.2015.01.018

  143. Multi-pin Langmuir probe measurement for identification of blob propagation characteristics in the Large Helical Device Reviewed

    H.Tanaka, S.Masuzaki, N.Ohno, T.Morisaki, Y.Tsuji, LHD Experiment Group

    Journal of Nuclear Materials   Vol. 463   page: 761-764   2015

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  144. Evolution of radiation profiles during detached plasmas and radiative collapse in LHD Reviewed

    S.N.Pandya, B.J.Peterson, M.Kobayashi, K.Mukai, R.Sano, H.Tanaka, S.Masuzaki, J.Miyazawa, T.Akiyama.G.Motojima N.Ohno

    Journal of Nuclear Materials   Vol. 463   page: 551-554   2015

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  145. Nanostructure growth by helium plasma irrdaition to tungsten in sputtering regime Reviewed

    Y.Noiri, S.Kajita, N.Ohno

    Journal of Nuclear Materials   Vol. 463   page: 285-288   2015

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  146. Progress of divertor simulation research toward the realization of detached palsam using a large tandem mirror device Reviewed

    Y.Nakashima, H.Takeda, K.Ichimura, K.Hosoi, K.Oki, M.Sakamoto, M.Hirata, M.Ichimura, R.Ikezoe, T.Imai, M.Iwamoto, Y.Hosoda, I.Katanuma, T.Kariya, S.Kigure, J.Kohagura, R.Minami, T.Numakura, S.Takahashi, M.Yoshikawa, N.Asakura, M.Fukumoto, A.Hatayama, Y.Hirooka, S.Kado, H.Kubo, S.Masuzaki, H.Matsuura, S.Nagata, N.Nishino, N.Ohno, A.Sagara, T.Shikama, M.Shoji, A.Tonegawa, Y.Ueda

    Journal of Nuclear Materials   Vol. 463   page: 537-540   2015

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  147. Impact of 3D magnetic field structure on boundary and divertor plasmas in stellarator /heliotron devices Reviewed

    M.Kobayasahi, Y.Feng, Y.Xu, F.L.Tabares, K.Ida, O.Schmitz, T.E.Evans, H.Frerichs, Y.Liang, A.bader, K.Itoh, H.Yamada, Ph.Ghendrih, G.Ciraolo, D.Tafalla, A.Lopez-Fraguas, H.Y.Guo, Z.Y.Cui, D.Reiter, N.Asakura, U.Wenzel, S.Morita, N.Ohno, B.J.Peterson, S.Masuzaki

    Journal of Nuclear Materials   Vol. 463   page: 2-10   2015

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  148. Global helium particle balance in LHD Reviewed

    G.Motojima, S.Masuzaki, M.Tokitani, H.Kasahara, Y.Yoshimura, M.Kobayashi, R.Sakamoto, T.Morisaki, J.Miyazawa, T.Akiyama, N.Ohno, T.Mutoh, H.Yamada, LHD Experiment Group

    Journal of Nuclear Materials   Vol. 463   page: 1080-1083   2015

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  149. Radiated power distributions in impurity-seeded plasmas in LHD Reviewed

    T.Morisaki, K.Oyama, N.Tamura, S.Masuzaki, T.Akiyama, G.Motojima, J.Miyazawa, B.J.Peterson, N.Ohno, H.Yamada, LHD Experiment Group

    Journal of Nuclear Materials   Vol. 463   page: 640-643   2015

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  150. Simulation Study of Power Load with Impurity Seeding in Advanced Divertor "Short Super-X Divertor" for a Tokamak Reactor Reviewed

    N.Asakura, K.Hoshino, K.Shimizu, K.Shinya, H.Utoh, S.Tokunaga, K.Tobita, N.Ohno

    Journal of Nuclear Materials   Vol. 463   page: 1238-1242   2015

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    DOI: 10.1016/j.jnucmat.2015.01.068

  151. Influence of external resonant magnetic perturbation field on edge plasma of small tokamak HYBTOK-II Reviewed

    Y.Hayashi, Y.Suzuki, N.Ohno, M.Okamoto, Y.Kikuchi, S.Sakakibara, K.Watanabe, Y.Takemura

    Journal of Nuclear Materials   Vol. 463   page: 463-466   2015

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    DOI: 10.1016/j.jnucmat.2014.12.018

  152. In-situ measurement of deuterium retention in W under plasma exposure Reviewed

    T. Watanabe, T. Kaneko, N. Matsunami, N. Ohno, S. Kajita, T. Kuwabara

    Journal of Nuclear Materials   Vol. 463   page: 1049-1052   2015

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    DOI: 10.1016/j.jnucmat.2014.12.011

  153. CORRELATION ANALYSIS OF 3-4 KILOHERTZ CORE AND EDGE DENSITY FLUCTUATIONS IN THE GAMMA 10 TANDEM MIRROR DEVICE Reviewed

    H. Tanaka, M. Sakamoto, K. Furutachi, K. Oki, M. Mizuguchi, Y. Nagatsuka, M. Yoshikawa, R. Nohara, M. Yoshikawa, J. Kohagura, N. Ohno, and Y. Tsuji

    Fusion Sci. Tech.   Vol. 68   page: 125-129   2015

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  154. Influence of Deuterium Retention on Secondary Electron Emission from Graphite under Deuterium Plasma Exposure Reviewed

    T.Kaneko, N.Ohno, Y.Nakamura, M.Yamagiwa, N.Matsunami, S.Kajita, M.Takagi

    Plasma and Fusion Research   Vol. 10   page: 1402009(5 pp)   2015

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  155. Arc spot grouping: An entanglement of arc spot cells Reviewed

    S.Kajita, D.Hwangbo, N.Ohno, M.M.Tsventoukh, S.A.Barengolts

    Journal of Applied Physics   Vol. 116   page: 233302   2014.12

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    DOI: 10.1063/1.4904917

  156. Current Activities in the Interactive Joint Research at Tohoku University - Advanced Evaluation of Radiation Effects on Fusion Materials - Reviewed

    H.Kurishita, M.Hatakeyama, M.Narui, S.Matsuo, T.Shikama, K.Tada, N.Ohno, T.Takeuchi, Y.Hatano, M.Nishiura, Y.Nakashima, H.Watanabe, K.Tokunaga, T.Hino, Y.Ueda, T.Muroga, A.Sagara, O.Kaneko

    Plasma and Fusion Research   Vol. 9   page: 3405136(4 pp)   2014.9

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    DOI: 10.1585/pfr.9.3405136

  157. Compact and high-particle-flux thermal-lithium-beam probe system for measurement of two-dimensional electron density profile Reviewed

    Y.Shibata, T.Manabe, S.Kajita, N.Ohno, M.Takagi, H.Tsuchiya, T.Morisaki

    Rev. Sci. Instrum.   Vol. 85   page: 93510(6 pp)   2014.9

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    DOI: 10.1063/1.4895718

  158. Application of Nanostructured Tungsten Fabricated by Helium Plasma Irradiation for Photoinduced Decolorization of Methylene Blue Reviewed

    K.Komori, T.Yoshida, S.Yagi, H.Yoshida, M.Yajima, S.Kajita, N.Ohno

    e-J.Surf.Sci.Nanotech.(e-Journal of Surface Science and Nanotechnology)   Vol. 12   page: 343-348   2014.7

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    DOI: 10.1380/ejssnt.2014.343

  159. Fractality of self-grown nanostructured tungsten by He plasma irradiation Reviewed

    S.Kajita, Y.Tsuji, N.Ohno

    Physics Letters A   Vol. 378   page: 2533-2538   2014.7

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  160. In situ observation of structural change of nanostructured tungsten during annealing Reviewed

    M.Yajima, N.Yoshida, S.Kajita, M.Tokitani, T.Baba, N.Ohno

    Journal of Nuclear Materials   Vol. 449 ( 1-3 ) page: 9-14   2014.6

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  161. Influence of plasma-neutral collisions on probe measurements in atmospheric pressure plasmas Reviewed International journal

    Contributions to Plasma Physics   Vol. 54 ( 3 ) page: 304 - 307   2014.4

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    DOI: 10.1002/ctpp.201410074

    Scopus

  162. In situ measurement of deuterium retention in graphite under successive exposure to deuterium and hydrogen plasmas Reviewed

    N.Ohno, Y.Nakamura, M.Yamagiwa, T.Kaneko, N.Matsunami, S.Kajita, M.Takagi

    Phys. Scr.   Vol. T159   page: 014053(4 pp)   2014.4

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  163. A plasma source driven predator-prey like mechanism as a potential cause of spiraling intermittencies in linear plasma devices Reviewed

    D.Reiser, N.Ohno, H.Tanaka, L.Vela

    Physics of Plasmas   Vol. 21   page: 032302(10 pp)   2014.3

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  164. Surface modification of titanium using He plasma Reviewed

    S.Kajita, D.Kitaoka, N.Ohno, R.Yoshihara, N.Yoshida, T.Yoshida

    Applied Surface Science   Vol. 303   page: 438-445   2014.3

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  165. Thermal response of nanostructured tungsten Reviewed

    S.Kajita, G.De Temmerman, T.Morgan, S.van Eden, T. de Kruif, N.Ohno

    Nuclear Fusion   Vol. 54   page: 033005(10 pp)   2014.2

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  166. Helium plasma irradiation on single crystal tungsten and undersized atom doped tungsten alloys Reviewed International journal

    Shin Kajita, Naoaki Yoshida, Noriyasu Ohno, Yuki Hirahata, Reiko Yoshihara

    PHYSICA SCRIPTA   Vol. 89 ( 2 )   2014.2

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    Helium plasma irradiation leads to the formation of nanostructures on the surface when certain conditions are satisfied. The surface morphology changes due to helium plasma irradiation were investigated on single crystal tungsten samples with different crystal orientations. Differences in surface morphology changes were observed in (100) and (110) single crystal tungsten samples when the helium fluence was less than 10(25) m(-2). However, the differences disappeared as growth proceeded. Tungsten alloys were prepared in order to investigate the influence of the additional undersized atomic species on nanostructure growth. The influence of the doping of undersized atoms, i.e. 2 at% Fe doped and 2 at% Cr doped atoms, is presented.

    DOI: 10.1088/0031-8949/89/02/025602

    Web of Science

    Scopus

  167. Optical design for divertor Thomson scattering system for JT-60SA Reviewed

    S.Kajita, A.Enokuchi, T.Hatae, K.Itami, T.Hamano, S.Kado, N.Ohno, N.Takeyama

    Fusion Engineering and Design   Vol. 89 ( 1 ) page: 69-76   2014.1

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  168. Helium plasma irradiation on single crystal tungsten and undersized atom doped tunsten alloys Reviewed

    S.Kajita, N.Yoshida, N.Ohno, Y.Hirahata, R.Yoshihara

    Phys. Scr.   Vol. 89   page: 025602(7 pp)   2014.1

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  169. Modified Power Transmission Factor of Tungsten in Plasmas with Hot Electron Component Reviewed

    S.Takamura, S.Ono, N.Ohno

    Contrib. Plasma Phys.   Vol. 54 ( 4-6 ) page: 474-478   2014

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  170. Transition in velocity and grouping of arc spot on different nanostructured tungsten electrodes Reviewed

    Dogyun Hwangbo, Shin Kajita, Sergey A. Barengolts, Mikhail M. Tsventoukh, Noriyasu Ohno

    RESULTS IN PHYSICS   Vol. 4   page: 33 - 39   2014

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    Behavior of arc spots was investigated in detail using a nanostructured tungsten specimen with different thicknesses of the nanostructured layer. From the observation using a fast framing camera, it was found that the velocity of the arc spots significantly altered as passing the boundary of the two layers. The changes in spot velocity and spot width were discussed theoretically using the ecton model. The fractal dimension of the arc trail evaluated by using a box-counting method was significantly changed. Also, the width of arc trail was increased with the nanostructured layer thickness. From the SEM analysis of the specimen, the amount of tungsten eroded by arcing for two different thickness cases was estimated, and the erosion rates were discussed. (C) 2014 The Authors. Published by Elsevier B.V.

    DOI: 10.1016/j.rinp.2014.03.001

    Web of Science

    Scopus

  171. Spectroscopic Study and Motion Analysis of Arc Spot Initiated on Nanostructured Tungsten Reviewed

    D.Hwangbo, S.Kajita, M.Osaka, N.Ohno

    Jpn. J. Appl. Phys.   Vol. 52   page: 11NC02(6 pp)   2013.11

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    DOI: 10.7567/JJAP.52.11NC02

  172. Low-energy helium irradiation on in-vessel mirror materials Reviewed

    S.Kajita, M.Tokitani, T.Saeki, N.Ohno, N.Yoshida

    Journal of Nuclear Materials   Vol. 442 ( 1-3, Supplement 1 ) page: S515-S519   2013.11

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  173. Helium effects on tungsten surface morphology and deuterium retention Reviewed

    Y.Ueda, H.Y.Peng, H.T.Lee, N.Ohno, S.Kajita, N.Yoshida, R.Doerner, G.De Temmerman, V.Alimov, G.Wright

    Journal of Nuclear Materials   Vol. 442 ( 1-3 ) page: S267-S272   2013.11

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  174. Properties of deposited layer formed by interaction with Be seede D-He mixture plasma and tungsten Reviewed

    K.Tokunaga, M.J.Baldwin, D.Nishijima, R.P.Doerner, S.Nagata, B.Tsuchiya, H.Kurishita, T.Fujiwara, K.Araki, Y.Miyamoto, N.Ohno, Y.Ueda

    Journal of Nuclear Materials   Vol. 442 ( 1-3 ) page: S313-S319   2013.11

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  175. Characterization of Gun Plasma Penetrated into a Steady State Plasma Device Reviewed

    S.Kajita, T.Akiyama, T.Nihashi, M.Osaka, N. Ohno, Y.Kikuchi, I.Sakuma, M.Nagata

    IEEE TRANSACTIONS ON PLASMA SCIENCE   Vol. 41 ( 11 ) page: 3122-3128   2013.11

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  176. Field emission property of nanostructured tungsten formed by helium plasma irradiation Reviewed

    Shin Kajita, Noriyasu Ohno, Yuki Hirahata, Mineo Hiramatsu

    FUSION ENGINEERING AND DESIGN   Vol. 88 ( 11 ) page: 2842 - 2847   2013.11

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    Field emission property of nanostructured tungsten formed by the exposure to a helium plasma is measured to investigate the initiation process of arcing in nuclear fusion devices. Field emission current from the nanostructured tungsten and tungsten with helium bubbles was significantly higher than that from the polished tungsten specimen. However, field enhancement factor was on the order of 100, which was almost comparable to that of bulk tungsten; the increase in the field emission current is attributed to primarily an increase in the effective emission surface area. From the calculation of thermo-field emission current from a heated tungsten, it is thought that a significant current emission can be still initiated even when the field enhancement factor is not so high when tungsten is exposed to high density plasmas such as the one accompanied with ELMs. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.fusengdes.2013.05.014

    Web of Science

    Scopus

  177. Control of 3D edge radiation structure with resonant magnetic perturbation fields applied to the stochastic layer and stabilization of radiative divertor plasma in LHD Reviewed

    M. Kobayashi, S. Masuzaki, I. Yamada, Y. Narushima, C. Suzuki, N. Tamura, B. J. Peterson, S. Morita, C. F. Dong, N. Ohno, S. Yoshimura, Y. Feng, M. Goto, K. Sato, T. Akiyama, K. Tanaka

    Nuclear Fusion   Vol. 53 ( 9 )   2013.9

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    It is found that resonant magnetic perturbation (RMP) fields have a stabilizing effect on the radiating edge plasma, realizing stable sustainment of radiative divertor (RD) operation in the Large Helical Device (LHD). Without RMP, thermal instability leads to radiative collapse. Divertor power load is reduced by a factor of 3-10 during the RMP-assisted RD phase, while maintaining relatively good core plasma confinement with confinement enhancement factor . It has also been demonstrated that the RMP field itself can initiate transition to RD operation by increasing perturbation strength, while keeping constant density and injection power. The results show a possibility of a new control knob for divertor power load in a 3D magnetic field configuration. It is also found that after the transition to RD, the energy confinement enhancement factor based on ISS04 scaling increases by a factor of 1.4 compared with the attached phase. The operation range of the RMP-assisted RD is identified in terms of RMP strength and radial location of the resonance layer of the RMP. A 3D edge radiation structure is analysed using the edge transport code EMC3-EIRENE and the results are compared with experiments. The comparison indicates that the application of RMP modulates the 3D edge radiation structure such that an intense radiation appears around the X-point of the m/n = 1/1 island in the case with RMP, while it is located at the inboard side without RMP. © 2013 IAEA, Vienna.

    DOI: 10.1088/0029-5515/53/9/093032

    Scopus

  178. Growth Annealing Equilibrium of Tungsten Nanostructures by Helium Plasma Irradiation in Non Eroding Regimes Reviewed

    S.Kajita, N.Ohno, M.Yajima, J.Kato

    Journal of Nuclear Materials   Vol. 440 ( 1-3 ) page: 55-62   2013.9

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  179. Influence of crystal orientation on damages of tungsten exposed to helium plasma Reviewed

    N.Ohno, Y.Hirahata, M.Yamagiwa, S.Kajita, M.Takagi, N.Yoshida, R.Yoshihara, T.Tokunaga, M.Tokitani

    Journal of Nuclear Materials   Vol. 438   page: S879-S882   2013.7

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  180. Study of Hydrogen Isotopes Behavior in Carbon Based Materials with In-Situ Ion Beam Analysis under Plasma Exposure Reviewed

    Y.Nakamura, M.Yamagiwa, T.Kaneko, N.Matsunami, N.Ohno, S.Kajita, M.Takagi, M.Tokitani, S.Masuzaki

    Journal of Nuclear Materials   Vol. 438   page: S1036-S1039   2013.7

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  181. Tritium retention in nanostructured tungsten with large effective surface area Reviewed

    M.Yajima, Y.Hatano, S.Kajita, J.Shi, M.Hara, N.Ohno

    Journal of Nuclear Materials   Vol. 438   page: S1142-S1145   2013.7

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  182. Enhancement of multi-pulse laser induced damage threshold on Cu mirror under vacuum condition Reviewed

    S.Kajita, R.Yasuhara, M.Sato, N.Ohno, M.Tokitani, N.Yoshida

    Optics Express   Vol. 21 ( 14 ) page: 17275-17284   2013.7

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  183. Development of steady/transient dual plasma irradiation device using a plasma gun Reviewed

    S.Kajita, N.Ohno, T.Akiyama, T.Nihashi, T.Uchiyama, M.Osaka, Y.Kikuchi, M.Nagata

    Journal of Nuclear Materials   Vol. 438   page: S707-S710   2013.7

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  184. Edge and divertor plasma measurements with ion sensitive and Mach probes in LHD Reviewed

    Y.Hayashi, N.Ezumi, S.Masuzaki, H.Tanaka, M.Kobayashi, K.Sawada, N.Ohno, the LHD Experiment Group

    Journal of Nuclear Materials   Vol. 438   page: S1228-S1231   2013.7

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  185. Tritium retention in nanostructured tungsten with large effective surface area Reviewed

    M.Yajima, Y.Hatano, S.Kajita, J.Shi, M.Hara, N.Ohno

    Journal of Nuclear Materials   Vol. 438   page: S1142-S1145   2013.7

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  186. Study of hydrogen isotopes behavior in carbon based materials with in situ ion beam analysis under plasma exposure Reviewed

    Y. Nakamura, M. Yamagiwa, T. Kaneko, N. Matsunami, N. Ohno, S. Kajita, M. Takagi, M. Tokitani, S. Masuzaki

    Journal of Nuclear Materials   Vol. 438   page: S1036-S1039   2013.7

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  187. Influence of crystal orientation on damages of tungsten exposed to helium plasma Reviewed

    N.Ohno, Y.Hirahata, M.Yamagiwa, S.Kajita, M.Takagi, N.Yoshida, R.Yoshihara, T.Tokunaga, M.Tokitani

    Journal of Nuclear Materials   Vol. 438   page: S879-S882   2013.7

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  188. Thermal radiation characteristics and direc evidence of tungsten cooling on the way to nanostructure formation on its surface Reviewed

    S.Takamura, T.Miyamoto, N.Ohno

    Journal of Nuclear Materials   Vol. 438   page: S814-S817   2013.7

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  189. Recent results of divertor simulation research using an end-cell of a large tandem mirror device Reviewed

    Y. Nakashima, H. Takeda, K. Ichimura, K. Hosoi, M. Sakamoto, M. Hirata, M. Ichimura, R. Ikezoe, T. Imai, T. Ishii, T. Kariya, I. Katanuma, J. Kohagura, R. Minami, T. Numakura, H. Ueda, M. Yoshikawa, N. Asakura, T. Furuta, A. Hatayama, et al.(N.Ohno No.27)

    Journal of Nuclear Materials   Vol. 438   page: S738-S741   2013.7

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  190. Kinetic effect of high energy ions on the temperature profile in the boundary plasma region Reviewed

    N.Ezumi, Y.Hayashi, K.Todoroki, K.Okazaki, H.Tanaka, S.Masuzaki, N.Ohno

    Journal of Nuclear Materials   Vol. 438   page: S472-S474   2013.7

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  191. Divertor heat and particle control experiments on the large helical device Reviewed

    S. Masuzaki, M.Kobayashi, T.Akiyama, N.Ohno, T.Morisaki, et al.

    Journal of Nuclear Materials   Vol. 438   page: S133-S138   2013.7

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  192. Field Emission Property of Nanostuructured Tungsten Formed by Helium Plasma Irradiation Reviewed

    S.Kajita, N.Ohno, Y.Hirahata, M.Hiramatsu

    Journal of Fusion Engineering and Design   Vol. 88   page: 2842-2847   2013.6

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  193. Investigation of Advanced Divertor Magnetic Configuration for Demo Tokamak Reactor Reviewed

    N.Asakura, K.Shinya, K.Tobita, K.Hoshino, K.Shimizu, H.Utoh, Y.Someya, M.Nakamura, N.Ohno, M.Kobayashi, H.Tanaka

    Transactions of Fusion Science and Technology   Vol. 63 ( 1T ) page: 70-75   2013.5

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  194. Power Transmission Factor for Tungsten Target W/WO Fiber-form Nanostructure in He Plasmas with Hot Electron Component using Compact Plasma Device AIT-PID Reviewed

    S.Takamura, T.Miyamoto, N.Ohno

    Transactions of Fusion Science and Technology   Vol. 63   page: 225-228   2013.5

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  195. Impact of arcing on carbon and tungsten: from the observations in JT-60U, LHD and NAGDIS-II Reviewed

    S.Kajita, M.Fukumoto, M.Tokitani, T.Nakano, Y.Noiri, N.Ohno, S.Masuzaki, S.Takamura, N.Yoshida, Y.Ueda

    Nuclear Fusion   Vol. 53   page: 053013(9 pp)   2013.4

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    DOI: 10.1088/0029-5515/53/5/053013

  196. Helium plasma implantation on metals: Nanostructure formation and visible-light photocatalytic response Reviewed

    S.Kajita, T.Yoshida, D.Kitaoka, R.Etoh, M.Yajima, N.Ohno, H.Yoshida, N.Yoshida, Y.Terao

    Journal of Applied Physics   Vol. 113   page: 134301(8 pp)   2013.4

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    DOI: doi.org/10.1063/1.4798597

  197. Assessment of multi-pulse laser-induced damage threshold of metallic mirrors for Thomson scattering system Reviewed

    M.Sato, S.Kajita, R.Yasuhara, N.Ohno, M.Tokitani, N.Yoshida, Y.Tawara

    Optics Express   Vol. 21 ( 8 ) page: 9333-9342   2013.4

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  198. Comparison of damages on tungsten surfac exposed to noble gas plasmas Reviewed

    M.Yajima, M.Yamagiwa, S.Kajita, N.Ohno et al.

    Plasma Science & Technol.   Vol. 15   page: 282-286   2013.3

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  199. Two-dimensional visualization of excitation temperature and chemical species in divertor plasmas: Trace CD molecules by chemical sputtering of fusion plasma reactor wall Reviewed

    Z.Cui, K.Kodama, M.Yamamoto, Q.Shen, M.Yoshimi, S.Kajita, N.Ohno, K.Kitagawa

    Microchemical Journal   Vol. 106   page: 174-179   2013.1

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  200. First Principles Investigation on Trapping of Multiple Helium Atoms within a Tungsten Monovacancy Reviewed

    A.Takayama, A.M.Ito, S.Saito, N.Ohno, H.Nakamura

    Japanese Journal of Applied Physics   Vol. 52   page: 01AL03(4 pp)   2013

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  201. Intermittent transport in edge plasma with a 3-D magnetic geometry in the Large Helical Device Reviewed

    H.Tanaka, S.Masuzaki, N.Ohno, T.Morisaki, Y.Tsuji, the LHD Experiment Group

    Journal of Nuclear Materials   Vol. 438   page: S563-S566   2013

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  202. Observation of Arc Spots Initiated on Nanostructured Tungsten Reviewed

    S.Kajita, N.Ohno, S.Takamura

    IEEE TRANSACTIONS ON PLASMA SCIENCE   Vol. 41 ( 8, Part 2 ) page: 1889-1895   2013

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  203. Deuterium Atomic Density Estimation in Recombining Plasmas Using Self-Absorption Spectroscopy Reviewed

    S.Kajita, T.Nishiwaki, N.Ohno, K.Sawada, M.Takagi

    IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING   Vol. 8 ( 1 ) page: 1-6   2013

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  204. Extension of operation regimes and investigation of three-dimensional currentless plasmas in the Large Helical Device Reviewed

    O.Kaneko, H.Yamada, S.Inagaki, M.Jakubowski, S.Kajita, et al.(N.Ohno is the 104th author))

    Nucl. Fusion   Vol. 53   page: 104015(11 pp)   2013

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  205. First-Principles Investigation on Trapping of Multiple Helium Atoms within a Tungsten Monovacancy Reviewed

    A.Takayama, A.M.Ito, S.Saito, N.Ohno, H.Nakamura

    Jpn. J. Appl. Phys.   Vol. 52   page: 01AL023(4 pp)   2013

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  206. Effect of resistivity profile on current decay time of initial phase of current quench in neon-gas-puff inducing disruptions of JT-60U Reviewed

    S.Kawakami, Y.Shibata, K.Y.Watanabe, N.Ohno, A.Isayama, T.Takizuka, Y.Kawano, M.Okamoto

    Physics of Plasmas   Vol. 20   page: 112507(6 pp)   2013

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  207. Degradation of optical reflectivity of in-vessel mirror materials by helium bombardment Reviewed

    S.Kajita, M.Tokitani, T.Saekim N.Ohno, N.Yoshida

    J. Nucl. Mater.   Vol. 417   page: 838-841   2013

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  208. Behavior of Plasma Response Field in Detached Plasma Reviewed International journal

    NARUSHIMA Yoshiro, KOBAYASHI Masahiro, AKIYAMA Tsuyoshi, SAKAKIBARA Satoru, MASUZAKI Suguru, ASHIKAWA Naoko, OHNO Noriyasu

    Plasma and Fusion Research   Vol. 8 ( 0 ) page: 1402058 - 1402058   2013

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:プラズマ・核融合学会  

    Sustaining a detached plasma is important for the reduction of the heat load on a divertor. The externally controlled methods such as gas puffing in the divertor region, etc. have been studied for maintaining detached plasmas. In the recent LHD experiments, a resonant magnetic perturbation (RMP) is utilized to establish the detached plasma, which is one of the candidates to reduce the divertor heat load. The finite plasma response field has been detected when the RMP is imposed, and its behavior is investigated from the viewpoint of the magnetic island dynamics. A parameter of the phase difference, Δ<i>θ</i> (defined as the phase difference between the plasma response field and the RMP), changes from antiphase to in-phase while the plasma transits from the attached to the detached states. Finally, when the Δ<i>θ</i> reaches at certain critical value, Δ<i>θ</i><sub>crit</sub>, the plasma enters the detached state. Since this critical value does not have a dependency on plasma beta and collisionality, Δ<i>θ</i><sub>crit </sub>seems to be a threshold to establish the detached plasma. From the viewpoint of magnetic island dynamics, the behavior of Δ<i>θ</i> approaching in-phase implies the "trend" of island growth. The detached plasma might be established in the case of the tendency for the plasma response field to reinforce the island width.

    DOI: 10.1585/pfr.8.1402058

  209. Blob/Hole Generation in the Divertor Leg of the Large Helical Device Reviewed

    H.Tanaka, N.Ohno, Y.Tsuji, S.Kajita, S.Masuzaki, M.Kobayashi, T.Morisaki, A.Komori and the LHD Experimental Group

    Plasma and Fusion Research   Vol. 7   page: 1402152(6 pp)   2012.11

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    DOI: 10.1585/pfr.7.1402152

  210. Fatal Damages due to Breakdown on a Diagnostic Mirror Located outside the Vacuum Vessel in JT-60U Reviewed

    S.Kajita, T.Hatae, T.Sakuma, S.Takamura, N.Ohno, K.Itami

    Plasma and Fusion Research   Vol. 7   page: 2405121(4 pages)   2012.9

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    DOI: 10.1585/pfr.7.2405121

  211. Optical properties of nanostructured tungsten in near infrared range Reviewed

    S.Kajita, N.Ohno, T.Yokochi, N.Yoshida, R.Yoshihara, S.Takamura, T.Hatae

    Plasma Physics and Controlled Fusion   Vol. 54   page: 105015(7 pages)   2012.9

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    DOI: 10.1088/0741-3335/54/10/105015

  212. Superimposition of Pulses to Steady Arc Discharge in Toroidal Divertor Simulator Reviewed

    S.Kajita, T.Uchiyama, N.Ohno

    Plasma and Fusion Research   Vol. 7   page: 1405100(6 pages)   2012.7

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    DOI: 10.1585/pfr.7.1405100

  213. Statistical Analysis of the Spatial Behavior of Plasma Blobs Around the Plasma Column in a Linear Plasma Device Reviewed

    H.Tanaka, N.Ohno, Y.Tsuji, K.Okazaki, S.Kajita

    Contrib. Plasma Phys.   Vol. 52 ( 5-6 ) page: 424 - 428   2012.6

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    DOI: 10.1002/ctpp.201210027

  214. Effect of Externally Applied Resonance Magnetic Perturbation on Current Decay during Tokamak Disruption Reviewed

    Y.Kanazawa, Y.Shibata, M.Okamoto, N.Ohno, S.Kajita

    Plasma and Fusion Research   Vol. 7   page: 1202049(2 pages)   2012.6

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    DOI: 10.1585/pfr.7.1202049

  215. Effect of neutral pressure on the He plasma flow measurement in a linear device Reviewed International coauthorship

    E.-K.Park, H.-J.Woo, K.-S.Chung, H.Tanaka, S.Kajita, N.Ohno

    Current Applied Physics   Vol. 12   page: 1479 - 1502   2012.5

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    DOI: 10.1016/j.cap.2012.04.024

  216. Transition in Plasma Fluctuation between Attached and Detached Plasmas Reviewed

    K.Okazaki, H.Tanaka, N.Ohno, S.Kajita

    Plasma and Fusion Research   Vol. 7   page: 1201033(2 pages)   2012.4

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    DOI: 10.1585/pfr.7.1201033

  217. Arcing on tungsten subjected to helium and transients: ignition conditions and erosion rates Reviewed International journal

    S.Kajita, N.Ohno, N.Yoshida, R.Yoshihara, S.Takamura

    PLASMA PHYSICS AND CONTROLLED FUSION   Vol. 54 ( 3 )   2012.2

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    Arcing is a long standing plasma-surface interaction issue in nuclear fusion research, and the issue has been revived recently from new points of view. In this study, arcing under fusion relevant conditions is demonstrated in a linear plasma device using a pulsed laser to mimic the transient heat load. Ignition conditions of arcing were investigated systematically by changing the laser power, plasma conditions, surface nature and so on. Moreover, the cross-sectional view of arc trail was observed by transmission electron microscope, and the erosion of nanostructured tungsten due to arcing was estimated. It was found that more than half of the nanostructured tungsten still remained after an arc spot run on the nanostructure.

    DOI: 10.1088/0741-3335/54/3/035009

    Web of Science

  218. TEM analysis of high temperature annealed W nanostructure surfaces Reviewed International journal

    Shin Kajita, Naoaki Yoshida, Reiko Yoshihara, Noriyasu Ohno, Takanori Yokochi, Masayuki Tokitani, Shuichi Takamura

    JOURNAL OF NUCLEAR MATERIALS   Vol. 421 ( 1-3 ) page: 22 - 27   2012.2

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    Helium plasma irradiation and electron heating experiments were conducted using tungsten in the divertor simulator NAGDIS-II. Helium plasma irradiation to tungsten led to the formation of nanostructures on the surface, while the nanostructures were annihilated after the potential of the specimen was changed to positive for several 10 min so that electrons irradiated the sample without ion irradiation. The specimens were analyzed in detail by transmission electron microscope with the help of focused ion beam technique. It is revealed that the helium nano-bubbles still remained even after the nanostructures were disappeared from the surface. Porosity of the nanostructured tungsten was measured from the TEM images. (c) 2011 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jnucmat.2011.11.044

    Web of Science

  219. Anisotropic Graphite Erosion in Low-Temperature and high-Density Deuterium Plasma Reviewed

    M.Teraoka, N.Ohno, S.Kajita, T.Nishiwaki, A.M.Ito, H.Nakamura

    Jpn. J. Appl. Phys.   Vol. 51   page: 01AB03 (5pp)   2012.1

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    DOI: 10.1143/JJAP.51.01AB03

  220. Near Infrared Radiation from Heated Nanostructured Tungsten Reviewed

    S.Kajita, T.Yokochi, N.Ohno, T.Kumano

    Jpn. J. Appl. Phys.   Vol. 51   page: 01AJ03 (5pp)   2012.1

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    DOI: 10.1143/JJAP.51.01AJ03

  221. Measurement of ion and electron temperatures in plasma blobs by using an improved ion sensitive probe system and statistical analysis methods Reviewed International journal

    K. Okazaki, H. Tanaka, H. Tanaka, N. Ohno, N. Ezumi, Y. Tsuji, S. Kajita

    Review of Scientific Instruments   Vol. 83   2012.1

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    We have measured ion temperature as well as electron temperature in plasma blobs observed in a linear plasma device by using an improved ion sensitive probe. Current-voltage characteristics of the ion sensitive probe inside and outside plasma blobs were re-constructed with a conditional sampling method. It is clearly found that both ion and electron temperatures in plasma blobs decrease more slowly in a cross-field direction than those in a bulk plasma without plasma blobs. © 2012 American Institute of Physics.

    DOI: 10.1063/1.3681778

    Scopus

  222. Thermionic Energy Converter System Using Heat Flux in Divertor Region Reviewed

    D.Oikawa, N.Ohno, S.Kajita, M.Takagi, S.Masuzaki, M.Tokitani, K.Asano

    Plasma and Fusion Research   Vol. 7   page: 1405050(8 pages)   2012

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  223. Conditions for the Release of a Metallic Dust Particle from a Plasma-Facing Wall Reviewed

    M.Ueno, N.Ohno, Y.Tomita, G.Kawamura

    Contrib. Plasma Phys.   Vol. 52 ( 5-6 ) page: 478-483   2012

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  224. Electric Field at a Plasma-Facing Wall for a Two-Temperature Electron Distribution Reviewed

    Y.Tomita, G.Kawamura, M.Ueno, N.Ohno, Z.H.Huang, Y.D.Pan, L.W.Yan

    Contrib. Plasma Phys.   Vol. 52 ( 5-6 ) page: 484-489   2012

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  225. Effects of fibre-form nanostructures on particle emissions from a tungsten surface in plasmas Reviewed

    S.Takamura, T.Miyamoto, N.Ohno

    Nuclear Fusion   Vol. 52   page: 123001(8 pages)   2012

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  226. TEM observation of the growth process of helium nanobubbles on tungsten: Nanostructure formation mechanism Reviewed International journal

    Kajita Shin, Yoshida Naoaki, Yoshihara Reiko, Ohno Noriyasu, Yamagiwa Masato

    JOURNAL OF NUCLEAR MATERIALS   Vol. 418 ( 1-3 ) page: 152 - 158   2011.11

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    DOI: 10.1016/j.jnucmat.2011.06.026

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  227. Helium bubble formation on tungsten in dependence of fabrication method Reviewed International journal

    Yamagiwa Masato, Kajita Shin, Ohno Noriyasu, Takagi Makoto, Yoshida Naoaki, Yoshihara Reiko, Sakaguchi Wataru, Kurishita Hiroaki

    JOURNAL OF NUCLEAR MATERIALS   Vol. 417 ( 1-3 ) page: 499 - 503   2011.10

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    DOI: 10.1016/j.jnucmat.2011.02.007

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  228. Nanoscale surface morphology of tungsten materials induced by Be-seeded D-He plasma exposure Reviewed International journal

    Tokunaga K., Baldwin M. J., Doerner R. P., Nishijima D., Kurishita H., Fujiwara T., Araki K., Miyamoto Y., Ohno N., Ueda Y.

    JOURNAL OF NUCLEAR MATERIALS   Vol. 417 ( 1-3 ) page: 528 - 532   2011.10

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    DOI: 10.1016/j.jnucmat.2011.01.078

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  229. Exfoliation of the tungsten fibreform nanostructure by unipolar arcing in the LHD divertor plasma Reviewed International journal

    Tokitani M., Kajita S., Masuzaki S., Hirahata Y., Ohno N., Tanabe T.

    NUCLEAR FUSION   Vol. 51 ( 10 )   2011.10

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    DOI: 10.1088/0029-5515/51/10/102001

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  230. Development of Nanostructured Black Metal by Self-Growing Helium Bubbles for Optical Application Reviewed International journal

    S.Kajita, T.Saeki, Y.Hirahata, M.Yajima, N.Ohno, R.Yoshihara, N.Yoshida

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 50 ( 8 ) page: 08JG01   2011.8

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    DOI: 10.1143/JJAP.50.08JG01

    Web of Science

  231. Investigation on the effect of temperature excursion on the helium defects of tungsten surface by using compact plasma device Reviewed

    S.Takamura, T.Miyamoto, Y.Tomida, T.Minagawa, N.Ohno

    Journal of Nuclear Materials   Vol. 415   page: S100-S103   2011.8

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    DOI: 10.1016/j.jnucmat.2010.12.021

  232. Exposure of tungsten nano-structure to TEXTOR edge plasma Reviewed International coauthorship

    Y.Ueda, K.Miyata, Y.Ohtsuka, H.T.Lee, M.Fukumoto, S.Brezinsek, J.W.Coenen, A.Kreter, A.Litnovsky, V.Philipps, B.Schweer, G.Sergienko, T.Hirai, A.Taguchi, Y.Torikai, K.Sugiyama, T.Tanabe, S.Kajita, N.Ohno, The TEXTOR team

    Journal of Nuclear Materials   Vol. 415 ( 1 ) page: S92 - S95   2011.8

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    DOI: 10.1016/j.jnucmat.2010.08.019

  233. Motion of unipolar arc spots ignited on a nanostructured tungsten surface Reviewed

    S.Kajita, S.Takamura, N.Ohno

    Plasma Physics and Controlled Fusion   Vol. 53 ( 7 ) page: 074002   2011.5

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    DOI: 10.1088/0741-3335/53/7/074002

  234. Molecular Dynamics Simulation of Hydrogen Injection onto Diamond Surfaces Reviewed

    H.Nakamura, A.M.Ito, S.Saito, A.Takayama, Y.Tamura, N.Ohno, S.Kajita

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 50 ( 1 ) page: 01AB04(4 pages)   2011.1

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    DOI: 10.1143/JJAP.50.01AB04

  235. Molecular Dynamics Simulation of Chemical Vapor Deposition of Amorphous Carbon: Dependence on H/C Ratio of Source Gas Reviewed

    A.M.Ito, A.Takayama, S.Saito, N.Ohno, S.Kajita, H.Nakamura

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 50 ( 1 ) page: 01AB01(6 pages)   2011.1

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    DOI: 10.1143/JJAP.50.01AB01

  236. Formation of Metallic Nanostructure by Helium Plasma Irradiation Reviewed

    S.Kajita, T.Saeki, Y.Hirahata, N.Ohno

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 50 ( 1 ) page: 01AH02   2011.1

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    DOI: 10.1143/JJAP.50.01AH02

    Web of Science

  237. Practical selection of emission lines of He I to determine the photon absorption rate Reviewed

    S.Kajita, N.Ohno

    Review of Scientific Instruments   Vol. 82   page: 023501(5 pages)   2011

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  238. Formation and decay processes of Ar/He microwave plasma jet at atmospheric gas pressure Reviewed

    S.Takamura, S.Amano, T.Kurata, H.Kasada, J.Yamamoto, M.A.Razzak, G.Kushida, N.Ohno, M.Kando

    Journal of Applied Physics   Vol. 110   page: 043301 (8 pages)   2011

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  239. Deuterium retention in Fe2O3 under low-energy deuterium-plasma exposure Reviewed

    N.Matsunami, T.Sogawa, Y.Sakuma, N.Ohno, M.Tokitani, S.Masuzaki

    Physica Scripta   Vol. T145   page: 014042 (4pp)   2011

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  240. In situ measurement of hydrogen isotope retention using a high heat flux plasma generator with ion beam analysis Reviewed

    M.Yamagiwa, Y.Nakamura, N.Matsunami, N.Ohno, S.Kajita, M.Takagi, M.Tokitani, S.Masuzaki, A.Sagara and K.Nishimura

    Physica Scripta   Vol. T145   page: 014032 (5pp)   2011

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  241. Recent progress of tungsten R&D for fusion application in Japan Reviewed

    Y.Ueda, H.T.Lee, N.Ohno, S.Kajita, A.Kimura, R.Kasada, T.Nagasaka, Y.Hatano, A.Hasegawa, H.Kurishita and Y.Oya

    Physica Scripta   Vol. T145   page: 014029 (6pp)   2011

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  242. Beryllium erosion induced by transient heat loads and subsequent reactions in a deuterium plasma Reviewed

    S.Kajita, D.Nishijima, R.Doerner, K.Umstadter, J.Yu, N.Ohno, Y.Ueda

    Journal of Nuclear Materials   Vol. 420   page: 252-257   2011

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  243. Study of Plasma Current Decay in the Initial Phase of High Poloidal Beta Disruptions in JT-60U Reviewed International journal

    SHIBATA Yoshihide, MATSUNAGA Go, KAMADA Yutaka, SUGIHARA Masayoshi, WATANABE Kiyomasa, OHNO Noriyasu, OKAMOTO Masaaki, ISAYAMA Akihiko, KURIHARA Kenichi, OYAMA Naoyuki, NAKANO Tomohide, KAWANO Yasunori

    Plasma and Fusion Research   ( 6 ) page: 1302136 - 1302136   2011

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    In order to validate some current decay models during the current quench, the plasma current decay time was studied using the experimental plasma resistance and inductance in high poloidal beta, &beta;<sub>p</sub>, disruptions in JT-60U. The plasma resistance and inductance were evaluated from an equilibrium calculation code and the measurement value of a magnetic sensor, the electron temperature evaluated by using ECE measurement and the electron density measured by FIR interferometer. In high &beta;<sub>p</sub> disruptions, it was found that the electron temperature at the plasma center just after current quench starts was approximately 1-4 keV under almost the same current decay time observed during the initial phase of current quench. This result indicates that the electron temperature itself plays no major role in the determination of the current decay time in the initial phase of current quench. Moreover, the current decay time predicted by a modified L/R model [Y. Shibata et al., Nucl. Fusion 50, 025015 (2010)], in which the time derivative of plasma inductance was considered, was in good agreement with the experimental current decay time, while the values obtained from the conventional L/R model were two orders of magnitude larger than the experimental results.

    DOI: 10.1585/pfr.6.1302136

  244. 2D Measurement of Edge Plasma Dynamics by Using High-Speed Camera Based on HeI Line Intensity Ratio Method Reviewed

    Ohno N., Miyamoto K., Kodama K., Kajita S., Kitagawa K.

    CONTRIBUTIONS TO PLASMA PHYSICS   Vol. 50 ( 10 ) page: 962 - 969   2010.11

  245. Enhancement of cross-field transport into the private region of detached-divertor in Large Helical Device Reviewed

    H. Tanaka, N. Ohno, Y. Tsuji, S. Kajita, S. Masuzaki, M. Kobayashi, T. Morisaki, H. Tsuchiya, A.Komori, and LHD Experimental Group

    Physics of Plasmas   Vol. 17   page: 102509(8pages)   2010.10

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    DOI: 10.1063/1.3496389

  246. Nanostructured Black Metal: Novel Fabrication Method by Use of Self-Growing Helium Bubbles Reviewed

    S.Kajita, T.Saeki, N.Yoshida, N.Ohno, A.Iwamae

    Applied Physics Express   Vol. 3   page: 085204-1-3   2010.7

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    DOI: 10.1143/APEX.3.085204

  247. 2D Statistical Analysis of Non-Diffusive Transport under Attached and Detached Plasma Conditions of the Linear Divertor Simulator Reviewed

    H.Tanaka, N.Ohno, Y.Tsuji, S.Kajita

    CONTRIBUTIONS TO PLASMA PHYSICS   Vol. 50 ( 3-5 ) page: 256 - 266   2010.5

  248. Basic Study on the Generation of RF Plasmas in Premixed Oxy-combustion with Methane Reviewed International coauthorship International journal

    Y.Osaka, N.Kobayashi, M.A.Razzak, N.Ohno, S.Takamura, Y.Uesugi

    Plasma and Fusion Research   ( 5 ) page: 010   2010.3

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    Oxy-combustion generates a high temperature field (above 3000 K), which is applied to next generation power plants and high temperature industrial technologies because of N<sub>2</sub> free processes. However, the combustion temperature is so high that the furnace wall may be fatally damaged. In addition, it is very difficult to control the heat flux and chemical species' concentrations because of rapid chemical reactions. We have developed a new method for controlling the flame by electromagnetic force on this field. In this paper, we experimentally investigated the power coupling between the premixed oxy-combustion with methane and radio frequency (RF) power through the induction coil. By optimizing the power coupling, we observed that the flame can absorb RF power up to 1.5 kW. Spectroscopic measurements also showed an increase in the emission intensity from OH radicals in the flame, indicating improved combustibility.

    DOI: 10.1585/pfr.5.010

  249. Study of current decay time during disruption in JT-60U tokamak Reviewed

    Y.Shibata, K.Y.Watanabe, M.Okamoto, N.Ohno, A.Isayama, K.Kurihara, T.Nakano, N.Oyama, Y.Kawano, G.Matsunaga, S.Sakakibara, M.Sugihara, Y.Kamada and the JT-60U team

    Nuclear Fusion   Vol. 50   page: 025015 (7pp)   2010

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  250. Formation Condition of Fiberform Nanostructured Tungsten by Helium Plasma Exposure Reviewed

    W. Sakaguchi, S. Kajita, N. Ohno, et al.

    Plasma Fusion Research   Vol. 5   page: S1023(5pages)   2010

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  251. Design study of the divertor Thomson scattering system for JT-60SA Reviewed

    S. Kajita, T. Hatae, K. Itami, N. Ohno, T. Nakano

    J. Plasma Fus. Res. Series   Vol. 9   page: 157-162   2010

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  252. 2D Measurement of Edge Plasma Dynamics by Using High-Speed Camera Based on HeI Line Intensity Ratio Method Reviewed

    N.Ohno, K.Miyamoto, K.Kodama, S.Kajita, K.Kitagawa

    Contrib. Plasma Physics   Vol. 50 ( 10 ) page: 962-969   2010

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  253. Deepening of Floating Potential for Tungsten Target Plate on the way to Nanostructure Formation Reviewed

    S.Takamura, T.Miyamoto and N.Ohno

    Plasma and Fusion Research: Rapid Communications   Vol. 5   page: 039(2 pages)   2010

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  254. Compact Plasma Device for PWI Studies Reviewed

    S.Takamura, T.Tsujikawa, Y.Tomida, K.Suzuki, T.Minagawa, T.Miyamoto, N.Ohno

    J. Plasma Fusion Res. SERIES   Vol. 9   page: 441-445   2010

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  255. 2D Statistical Analysis of Non-Diffusive Transport under Attached and Detached Plasma Conditions of the Linear Divertor Simulator Reviewed

    H.Tanaka, N.Ohno, Y.Tsuji, S.Kajita

    Contrib. Plasma Physics   Vol. 50 ( 3-5 ) page: 256-266   2010

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  256. Self-Affine Fractality of Bifurcating Arc Trail in Magnetized Plasma Reviewed

    Shin KAJITA, Noriyasu OHNO, Yoshiyuki TSUJI, Hirohiko TANAKA, and Shuichi TAKAMURA

    Journal of the Physical Society of Japan   Vol. 79 ( 5 ) page: 054501(7 pages)   2010

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  257. Fluid Mechanical Characteristics of Microwave Discharge Jet Plasmas at Atmospheric Gas Pressure Reviewed

    S.Takamura, S.Saito, G.Kushida, M.Kando, N.Ohno,

    IEEJ Trans. FM   Vol. 130 ( 5 ) page: 493-500   2010

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  258. Comparison with Surfaces of Diamond and Graphite for Adsorption of Hydrogen Reviewed

    H.Nakamura, A.Ito, S.Saito, Y.Tamura, S.Fujiwara, N.Ohno, S.Kajita

    Proceedings of ITC19, 2009   Vol. 1   2010

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  259. Recent progress in understanding the behavior of dust in fusion devices Reviewed

    S.I.Krasheninnikov, A.Yu Pigarov, R.D.Smirnov, M.Rosenberg, Y.Tanka, D.J.Benson, T.K.Soboleva, T.D.Rognlien, D.A.Mendis, B.D.Bray, D.L.Rudakov, J.H.Yu, W.P.West, A.L.Roquemore, C.H.Skinner, J.L.Terry, B.Lipschultz, A.Bader, R.S.Granetz, C.S.Pitcher, N.Ohno, S.Takamura, S.Masuzaki, N.Ashikawa, M.Shiratani, M.Tokitani, R.Kumazawa, N.Asakura, T.Nakano, A.J.Litnovsky, R.Maqueda and the LHD Experimental Group

    Plasma Physics and Controlled Fusion   Vol. 50 ( 12 ) page: 124054(13 pp)   2010

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  260. Degradation of optical reflectivity of in-vessel mirror materials by helium bombardment Reviewed

    S.Kajita, T.Saeki, N.Ohno, M.Tokitani, T.Hatae, W.Sakaguchi

    J. Nuclear Mater.     2010

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    DOI: doi:10.1016/j.jnucmat.2010.12.205

  261. Tungsten blow-off in response to the ignition of arcing: revival of arcing issue in future fusion devices Reviewed

    S.Kajita, S.Takamura, N.Ohno

    J. Nuclear Mater.     2010

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    DOI: doi:10.1016/jjnucmat_2010.08.030.

  262. Comparison of Hydrogen Adsorption on Diamond and Graphite Surfaces Reviewed International journal

    NAKAMURA Hiroaki, ITO Atsuhi M., SAITO Seiki, TAMURA Yuichi, FUJIWARA Susumu, OHNO Noriyasu, KAJITA Shin

    Plasma and Fusion Research   ( 5 ) page: S2072 - S2072   2010

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    By a classical molecular dynamics (CMD) simulation with a modified Brenner's reactive empirical bond-order (REBO) potential, we found that graphite with zigzag (1010) and armchair (1120) edge states is destroyed more easily than other structures, i.e., graphite with the (0001) surface, and diamond with the (100), (111), (120), and (110) surfaces. Experimental results indicated that graphite is eroded under hydrogen atom injection with E<sub>in</sub> = 0.3 eV, and that diamond is not eroded under the same conditions. Our simulation results are consistent with these experimental results. We also reveal the temperature and saturation dependence of the surface structure of carbon crystals.

    DOI: 10.1585/pfr.5.S2072

  263. Steady-State Operation Scenario and the First Experimental Result on QUEST Reviewed International journal

    HANADA Kazuaki, MAEKAWA Takashi, KISHIMOTO Yasuaki, ISHIGURO Masaki, YOSHINAGA Tomokazu, IGAMI Hiroe, NISHINO Nobuhiro, HONMA Hiroshi, KAWASAKI Shoji, NAKASHIMA Hisatoshi, HIGASHIJIMA Aki, SATO Kohnosuke, HIGASHIZONO Yuta, ANDO Akira, ASAKURA Nobuyuki, EJIRI Akira, HIROOKA Yoshihiko, ISHIDA Akio, KOMORI Akio, MATSUKAWA Makoto, MOTOJIMA Osamu, OGAWA Yuichi, ZUSHI Hideki, OHNO Noriyasu, ONO Yasushi, PENG Martin, SUDO Shigeru, YAMADA Hiroshi, YOSHIDA Naoaki, YOSHIDA Zensho, NAKAMURA Kazuo, SAKAMOTO Mizuki, IDEI Hiroshi, HASEGAWA Makoto, TAKASE Yuichi, MITARAI Osamu

    Plasma and Fusion Research   ( 5 ) page: S1007 - S1007   2010

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    QUEST focuses on the steady state operation of the spherical tokamak by controlled PWI and electron Bernstein wave current drive. One of the main purposes of QUEST is an achievement of long duration discharge with MW-class injected power. As the result, QUEST should be operated in the challenging region on heat and particle handling. To do the particle handling, high temperature all metal wall up to 623 K and closed divertors are planned, which is to realize the steady-state operation under recycling ratio, R = 1. This is a dispensable check to DEMO, because wall pumping should be avoided as possible in the view of tritium retention. The QUEST project will be developed in increment step such as, I. low &beta; steady state operation in limiter configuration, II. low &beta; steady state operation in divertor configuration, III. relatively high &beta; steady state operation in closed divertor configuration. Phase I in the project corresponds to these two years, and final goal of phase I is to make full current drive plasma up to 20 kA. Closed divertor will be designed and tested in the Phase II. QUEST is running from Oct., 2008 and the first results are introduced.

    DOI: 10.1585/pfr.5.S1007

  264. Formation process of tungsten nanostructure by the exposure to helium plasma under fusion relevant plasma conditions Reviewed

    S.Kajita, W.Sakaguchi, N.Ohno, N.Yoshida, T.Saeki

    Nuclear Fusion   Vol. 49   page: 095005(6pp)   2009.8

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    DOI: 10.1088/0029-5515/49/9/095005

  265. Development of Divertor Plasma Simulators with High Heat Flux Plasmas and its Application to Nuclear Fusion Study : A Review Reviewed International journal

    OHNO Noriyasu, KAJITA Shin, TAKAGI Makoto, TAKAMURA Shuichi

    IEEJ transactions on electrical and electronic engineering : official journal of the Institute of Electrical Engineering of Japan / = 電気学会   Vol. 4 ( 4 ) page: 476 - 487   2009.7

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  266. Ray tracing simulation for radiation trapping of the He I resonance transition in a linear plasma device Reviewed International coauthorship

    S.Kajita, D.Nishijima,E.M.Hollmann, N.Ohno

    Physics of Plasmas   Vol. 16   page: 063303   2009.6

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    DOI: 10.1063/1.3157248

  267. Investigation of detached recombining deuterium plasma and carbon chemical erosion in the toroidal divertor simulator NAGDIS-T Reviewed

    K.Yada, N.Matsui, N.Ohno, S.Kajita, S.Takamura, M.Takagi

    Journal of Nuclear Materials   Vol. 390-391   page: 290 - 294   2009.6

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    DOI: 10.1016/j.jnucmat.2009.01.123

  268. Spherical cauliflower-like carbon dust formed by interaction between deuterium plasma and graphite target and its internal structure Reviewed International journal

    Ohno N., Yoshimi M., Tokitani M., Takamura S., Tokunaga K., Yoshida N.

    JOURNAL OF NUCLEAR MATERIALS   Vol. 390-91   page: 61 - 64   2009.6

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    DOI: 10.1016/j.jnucmat.2009.01.051

    Web of Science

  269. Prompt ignition of a unipolar arc on helium irradiated tungsten Reviewed

    S.Kajita, S.Takamura and N.Ohno

    Nuclear Fusion   Vol. 49   page: 032002(4pp)   2009.2

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    DOI: 10.1088/0029-5515/49/3/032002

  270. Visualized blow-off from helium irradiated tungsten in response to ELM-like heat load Reviewed

    S.Kajita, N.Ohno, W.Sakaguchi, M.Takagi

    Plasma and Fusion Research   Vol. 4   page: 004(6 pages)   2009

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  271. In situ reflectivity of tungsten mirrors under helium plasma exposure Reviewed

    W.Sakaguchi, S.Kajita, N.Ohno, M.Takagi

    Journal of Nuclear Materials     page: doi:10.1016/j.jnucmat.2009.01.276   2009

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  272. Statistical analysis to the SOL plasma fluctuation in JT-60U Reviewed

    N. Asakura, N. Ohno, H. Tanaka, H. Kawashima, T. Nakano

    J.Nucl. Mater.   Vol. 390-391   page: 364-367   2009

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  273. Effects of tungsten surface conditions on carbon deposition Reviewed

    Y. Ueda, M. Fukumoto, A. Yamawaki, Y. Soga, Y. Ohtsuka, S. Brezinsek, T. Hirai, A. Kirschner, A. Kreter, A. Litnovsky, V. Philipps, A. Pospieszczyk, B. Schweer, G. Sergienko, T. Tanabe, K. Sugiyama, K. Ohya, N. Ohno and The TEXTOR team

    J.Nucl. Mater.   Vol. 390-391   page: 44-48   2009

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  274. Deuterium retention in Tungsten Oxyside under low-voltage D2+ plasma exposure Reviewed

    N.Matsunami, N.Ohno and M.Tokitani

    J.Nucl. Mater.   Vol. 390-391   page: 693-695   2009

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  275. Development of net-current free heliotron plasmas in the Large Helical Device Reviewed

    A.Komori, H.Yamada, S.Sakakibara, O.Kaneko, K.Kawahata, T.Mutoh, N.Ohyabu, S.Imagawa, K.Ida, Y.Nagayama, T.Shimozuma, K.Y.Watanabe, T.Mito, M.Kobayashi, K.Nagaoka, R.Sakamoto, N.Yoshida, S.Ohdachi, N.Ashikawa, Y.Feng, T.Fukuda, H.Igami, S.Inagaki, H.Kasahara, S.Kubo, R.Kumazawa, O.Mitarai, S.Murakami, Y.Nakamura, M.Nishiura, T.Hino, S.Masuzaki, K.Tanaka, K.Toi, A.Weller, M.Yoshinuma, Y.Narushima, N.Ohno, T.Okamura, N.Tamura, K.Saito, T.Seki, S.Sudo, H.Tanaka, T.Tokuzawa, N.Yanagi, M.Yokoyama, Y.Yoshimura, T.Akiyama, H.Chikaraishi, M.Chowdhuri, M.Emoto, N.Ezumi, H.Funaba, L.Garcia, P.Goncharov, M.Goto, K.Ichiguchi, M.Ichimura, H.Idei, T.Ido, S.Iio, K.Ikeda, M.Irie, A.Isayama, T.Ishigooka, M.Isobe, T.Ito, K.Ito, A.Iwamae, S.Hamaguchi, T.Hamajima, S.Kitajima, S.Kado, D.Kato, T.Kato, S.Kobayashi, K.Kondo, S.Masamune, Y.Matsumoto, N.Matunami, T.Minami, C.Michael, H.Miura, J.Miyazaa, N.Mizuguchi, T.Morisaki, S.Morita, G.Motojima, I.Murakami, S.Muto, K.Nagasaki, N.Nakajima, Y.Nakamura, H.Nakanishi, H.Nakano, K.Narihara, A.Nishimura, H.Nishimura, K.Nishimura, S.Nishimura, N.Nishino, T.Notake, T.Obana, K.Ogawa, Y.Oka, T.Ohishi, H.Okada, K.Okuno, K.Ono, M.Osakabe, T.Osako, T.Ozaki, B.J.Peterson, H.Sakaue, M.Sasao, S.Satake, K.Sato, M.Sato, A.Shimizu, M.Shiratani, M.Shoji, H.Sugama, C.Suzuki, Y.Suzuki, K.Takahata, H.Takahashi, Y.Takase, Y.Takeiri, H.Takenaga, S.Toda, Y.Toda, M.Tokitani, H.Tsuchiya, K.Tsumori, H.Urano, E.Veshchev, F.Watanabe, T.Watanabe, T.H.Watanabe, I.Yamada, S.Yamada, O.Yamagishi, S.Yamaguchi, S.Yoshimura, T.Yoshinaga and O.Motojima

    Nuclear Fusion   Vol. 49   page: 104015(8pp)   2009

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  276. Direct observation of cathode spot grouping using nanostructured electrode Reviewed

    S.Kajita, N.Ohno, S.Takamura, Y.Tsuji

    Physics Letters A   Vol. 373   page: 4273-4277   2009

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  277. Discharge Bifurcation of Microwave-sustained Helium Plasma Torch at Atmospheric Pressure Reviewed

    S.Takamura, M.Kando, N.Ohno

    J.Plasma Fusion Res. SERIES   Vol. 8   page: 910-913   2009

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  278. High temperature irradiation damage of carbon materials studies by laser Raman spectroscopy Reviewed

    M.Yoshida, T.Tanabe, N.Ohno, M.Yoshimi, S.Takamura

    Journal of Nuclear Materials   Vol. 386-388   page: 841-843   2009

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  279. *Development of Divertor Plasma Simulators with High Heat Flux Plasmas and its Application to Nuclear Fusion Study: A Review Reviewed

    N.Ohno, S.Kajita, M.Takagi, S.Takamura

    TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING IEEJ Trans.   Vol. 4   page: 476,487   2009

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  280. Formation and mitigation of fiberform nanostructured tungsten by helium and sub-ms laser pulse irradiations Reviewed

    S.Kajita, W.Sakaguchi and N.Ohno

    Plasma Devices and Operations   Vol. 17   page: 165,173   2009

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  281. Statistical analysis of fluctuation characteristics at high- and low-field sides in L-mode SOL plasmas of JT-60U Reviewed

    H.Tanaka, N.Ohno, N.Asakura, Y.Tsuji, H.Kawashima, S.Takamura, Y.Uesugi and the JT-60U Team

    Nuclear Fusion   Vol. 49   page: 65017   2009

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  282. *Spherical cauliflower-like carbon dust formed by interaction between deuterium plasma and graphite target and its internal structure Reviewed

    N.Ohno, M.Yoshimi, M.Tokitani, S.Takamura, K.TOkunaga, N.Yoshida

    Journal of Nuclear Materials     page: doi:10.1016/j.jnucmat.2009.01.051   2009

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  283. Measurement of Plasma Properties of the Atmospheric Oxy-Combustion Flame by Using Double Probe Method Reviewed

    Y.Osaka, N.Kobayashi, N.Ohno, S.Takamura, Y.Tanaka, Y.Uesugi

    Contrib. Plasma Physics   Vol. 48 ( 5-7 ) page: 485-490   2008

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  284. Intermittency and extended self-similarity in space and fusion plasma: boundary effects Reviewed

    V.P.Budaev, S.Savin, L.Zelencyi, N.Ohno, S.Takamura and E.Amata

    Plasma Physics and Controlled Fusion   Vol. 50   page: 074014(20pp)   2008

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  285. Extended self-similarity of intermittent turbulencein edge magnetized plasmas Reviewed

    V.P. Budaev, N. Ohno, S.Takamura, S. Masuzaki, A. Komori, T. Morisaki

    Nuclear Fusion   Vol. 48   page: 24014   2008

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  286. Deuterium retention near surface of TiO2 by low-voltage D2 plasma discharge Reviewed

    N.Matsunami, T.Tanaka, N.Ohno and M.Tokitani

    Phys. Stat. Sol.(c)   Vol. 5 ( 4 ) page: 923-926   2008

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  287. ELM propagation in the low- and high- filed-side Scrape-off Layer of the JT-60U tokamak Reviewed

    N.Asakura, H.Kawashima, N.Ohno, G.Matsunaga, T.Nakano and N.Oyama

    Journal of Physics; Conference Series   Vol. 123   page: 012009(11pp)   2008

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  288. Statistical properties of edge plasma turbulence in the Large Helical Device Reviewed

    J.M.Dewhurst, B.Hnat, N.Ohno, R.O.Dendy, S.Masuzaki, T.Morisaki and A.Komori

    Plasma Physics and Controlled Fusion   Vol. 50   page: 095013(15pp)   2008

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  289. Fluctuating Helium Emission in Optically Thick Divertor Plasmas Reviewed

    F. B. Rosmej, N. Ohno, S. Takamura, S. Kajita

    Contributions to Plasma Physics   Vol. 48   page: 243-248   2008

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  290. Numerical Modeling of Behavior of Dust Made of Different Materials in Plasmas Reviewed

    Y. Tanaka, A. Yu. Pigarov, R. D. Smirnov, S. I. Krasheninnikov, N. Ohno, Y. Uesugi

    Contributions to Plasma Physics   Vol. 48   page: 295-299   2008

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  291. Extended Self-Similarity in Edge Plasma Turbulence of Fusion Devices Reviewed

    V. P. Budaev, N. Ohno, S. Takamura, S. Masuzaki, A. Komori, T. Morisaki

    Contributions to Plasma Physics   Vol. 48   page: 42-47   2008

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  292. Plasma Rotation Measurements by Passive Spectroscopic Method in the HYBTOK-II using a Dynamic Ergodic Divertor Reviewed

    Y.Hasebe, M.Okamoto, S.Kajita, N.Ohno and S.Takamura

    Plasma and Fusion Research   Vol. 3   page: S1015   2008

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  293. Sub-ms Laser Pulse Irradiation on Tungsten Target Damaged by Exposure to Helium Plasma Reviewed

    S.Kajita, S.Takamura, N.Ohno, D.Nishijima, H.Iwakiri, N.Yoshida

    Nuclear Fusion   Vol. 47   page: 1358 - 1366   2007.9

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    DOI: 10.1088/0029-5515/47/9/038

  294. Integrated view of disruption dynamics on internal electromagnetic and plasma structures in the small tokamak HYBTOK-II Reviewed

    M. Okamoto, S. Takamura, N. Ohno, S. Kajita, Y. Kikuchi, Y. Uesugi, T. Ozeki, Y. Kawano, M. Sugihara

    Nuclear Fusion   Vol. 47   page: 1106 - 1111   2007.8

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    DOI: 10.1088/0029-5515/47/9/006

  295. Surface modification at tungsten and tungsten coated graphite due to low energy and high fluence plasma and laser pulse irradiation Reviewed International journal

    Ohno N., Kajita S., Nishijima Dai, Takamura S.

    JOURNAL OF NUCLEAR MATERIALS   Vol. 363   page: 1153 - 1159   2007.6

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    DOI: 10.1016/j.jnucmat.2007.01.148

    Web of Science

  296. Modeling of Dust-particle Behavior for Different Materials in Plasmas Reviewed

    Y.Tanaka, A.Yu.Pigarov, R.D.Smirnov, S.I.Krasheninnikov, N.Ohno, Y.Uesugi

    Physics of Plasmas   Vol. 14   page: 52504   2007.5

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    DOI: 10.1063/1.2722274

  297. Systematic Analysis of Current Decay Time during Disruption in HYBTOK-II Tokamak Reviewed

    M.Okamoto, N.Ohno, S.Takamura

    Plasma and Fusion Research   Vol. 3   page: 6   2007

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  298. Effect of Cross-field Transport on H-Density Profile in Magnetized Plasmas: Comparison Between Measurement and Simulation Reviewed

    S.Kajita, S.Kado, N.Ohno, K.Kurihara, Y.Kuwahara, S.Takamura

    Physics of Plasmas   Vol. 14   page: 103503   2007

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  299. Plasma-assisted Laser Ablaion of Tungsten: Reduction in Ablation Power Threshold Due to Bursting of Holes/Bubbles Reviewed

    S.Kajita, N.Ohno, S.Takamura, W.Sakaguchi, D.Nishijima

    Applied Physics Letters   Vol. 9191   page: 261501   2007

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  300. Development of Tungsten Materials for Plasma Facing Components in Japan Reviewed

    Y.Ueda, N.Ohno, S.Kajita, H.Kurishita, H.Iwakiri et al

    Fusion Science and Technology   Vol. 52   page: 513-520   2007

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  301. Overview of JT-60U results for the Development of a Steady-state Advanced Tokamak Scenario Reviewed

    H.Takenaga, the JT-60 Team

    Nuclear Fusion   Vol. 47   page: S563-S578   2007

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  302. Structural Bifurcation of Microwave Helium Jet Discharge at Atmospheric Pressure Reviewed

    S.TAKAMURA, M.KITOH, T.SOGA, H.TAKASHIMA, Y.NISHINO, S.HAYAKAWA, Y.BAN, T.YUHKI, M.KANDO, N.OHNO

    Plasma and Fusion Research   Vol. 3   page: 12   2007

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  303. High density plasma generation by RF ohmic discharge in toroidal divertor simulator NAGDIS-T Reviewed

    M. Nagase, H. Masuda, N. Ohno, S. Takamura and M. Takagi

    Journal of Nuclear Materials   Vol. 363-365   page: 611-615   2007

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  304. High Density Plasma Generation by RF Ohmic Discharge in Toroidal Divertor Simulator NAGDIS-T Reviewed

    M.Nagase, H.Masuda, N.Ohno, S.Takamura, M.Takagi

    J. Nucl. Mater.   Vol. 363-365   page: 611-615   2007

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  305. Dynamic Interaction between Disruptive Plasma and Wall in the Small Tokamak HYBTOK-II Reviewed

    M.Okamoto, T.Yamada, T.Hiraishi, Y.Kikuchi, N.Ohno, S.Takamura

    J. Nucl. Mater.   Vol. 363-365   page: 1076-1080   2007

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  306. Alleviation of Damaged Tungsten Having Helium Holes/Bubbles by Use of Transient Heat Load Reviewed

    S.Kajita, S.Takamura, N.Ohno, T.Nishimoto

    Plasma Fusion Research   Vol. 2   page: 9   2007

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  307. Plasma-surface Interaction, Scrape-off Layer and Divertor Physics: Implications for ITER Reviewed

    B.Lipschultz, X.Bonnin, G.Counsell, A.Kallenbach, A.Kukushkin, K.Krieger, A.Leonard, A.Loarte, .Neu, R.A.Pitts, T.Rognlien, J.Roth, C.Skinner, J.L.Terry, E.Tsitrone, D.Whyte, S.Zweben, N.Asakura, D.Coster, R.Doerner, R.Dux, G.hendrih, A.Herrmann, J.Hu, S.Krasheninnikov, G.Kirnev, A.Kreter, V.Kurnaev, B.LaBombard, S.Lisgo, T.Nakano, N.Ohno, H.D.Pacher, J.Paley, Y.Pan, G.Pautasso, V.Philipps, V.Rohde, D.Rudakov, P.Stangeby, S.Takamura, T.Tanabe, Y.Yang, S.Zhu

    Nuclear Fusion   Vol. 47   page: 1189-1205   2007

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  308. Extended Steady-state and High-beta Regimes of Net-current Free Heliotron Plasmas in the Large Helical Device Reviewed

    O.Motojima, H.Yamada, A.Komori, N.Ohyabu, T.Mutoh, O.Kaneko, K.Kawahata, T.Mito, K.Ida, S.Imagawa, Y.Nagayama, T.Shimozuma, K.Y.Watanabe, S.Masuzaki, J.Miyazawa, T.Morisaki, S.Morita, S.Ohdachi, N.Ohno, K.Saito, S.Sakakibara, Y.Takeiri, N.Tamura, K.Toi, M.Tokitani, M.Yokoyama, M.Yoshinuma, K.Ikeda, A.Isayama, K.Ishii S.Kubo, S.Murakami, K.Nagasaki, T.Sekim K.Takahata, H.Takenaga and the LHD Experimental Group

    Nuclear Fusion   Vol. 47   page: S668-S676   2007

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  309. Alleviation of Helium Holes/Bubbles on Tungsten Surface by Use of Transient Heat Load Reviewed International journal

    KAJITA Shin, TAKAMURA Shuichi, OHNO Noriyasu, NISHIMOTO Tentaro

    Plasma and Fusion Research   ( 2 ) page: 9 - 9   2007

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    The alleviation effect of transient heat load on helium holes/bubbles has been demonstrated using ruby laser pulses for the transient heat source in the divertor simulator NAGDIS-II. It is shown that the holes and bubbles disappeared following the irradiation of the ruby laser pulses, while the surface roughness was significantly enhanced by the irradiation of the Nd:YAG laser pulses. Based on the numerically calculated temperature in the specimen, the physical mechanism causing this difference is discussed particularly in terms of pulse width (0.6 ms for ruby laser without a Q-switch and 5 ns for Nd:YAG laser with a Q-switch).

    DOI: 10.1585/pfr.2.009

  310. Reduction of laser power threshold for melting tungsten due to subsurface helium holes Reviewed International journal

    Kajita Shin, Nishijima Dai, Ohno Noriyasu, Takamura Shuichi

    JOURNAL OF APPLIED PHYSICS   Vol. 100 ( 10 )   2006.11

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    DOI: 10.1063/1.2387151

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  311. Comparison of HeI Line Intensity Ratio Method and Electrostatic Probe for Electron Density and Temperature Measurements in NAGDIS-II Reviewed

    S.Kajita, N.Ohno, S.Takamura, T.Nakano

    Physics of Plasmas   Vol. 13   page: 013301(9pages)   2006.1

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    DOI: 10.1063/1.2164461

  312. Charactersitics of rf inductive plasma in oxy-combustion

    Yugo Osaka, Noriyuki Kobayashi, M.A.Razzak, Noriyasu Ohno, Shuichi Takamura

    The 4th International Conference on Combustion, Incineration/Pyrolysis and Emission Control, September 26-29, 2006, Kyoto, Japan   Vol. 1   2006

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  313. Fundamental research on plasma-assisted combustion by applying rf power

    Yugo Osaka, Noriyuki Kobayashi, M.A.Razzak, Noriyasu Ohno, Shuichi Takamura

    11th Asian Pacific Confederation of Chemical Engineering Congress, August 27-30, 2006 Kuala Lumpur, Malaysia   Vol. 1   2006

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  314. Dust Formation and Transport in the Divertor Plasma Simulators

    N.Ohno, M.Miyoshi, T.Yamada, M.Pustylnik, S.Kajita, S.Takamura

    7th Workshop ont Fine Particle Plasma, NIFS, oki, Japan December, 15-16, 2006(招待講演)   Vol. 1   2006

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  315. Two-dimensional measurement of plasma dynamics with an ICCD fast camera based on HeI line intensity ratio method

    N.Yamamoto, K.Miyamoto, K.Kitagawa, S.Kajita, M.Okamoto, N.Ohno

    16th International Toki Conference on Advanced Imaging and Plasma Diagnostics, Toki, Gifu, Japan, Dec. 5-8, 2006     page: 6-15   2006

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  316. Imaging of tungsten impurity ejected from damaged material due to transient heat load

    S.Kajita, N.Ohno, S.Takamura

    16th International Toki Conference on Advanced Imaging and Plasma Diagnostics, Toki, Gifu, Japan, Dec. 5-8, 2006     page: 4-01   2006

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  317. ELM Propagation and Fluctuations Characteristics in H- and L-mode SOL Plasmas on JT-60U

    N.Asakura, N.Ohno, H.Kawashima, H.Miyoshi, G.Matsunaga, N.Oyama, S.Takamura, Y.Uesugi, M.Takechi, T.Nakano, H.Kubo

    21st IAEA Fusion Energy Conference, Chengdu, China, Oct. 16-21, 2006     page: EX/9-2   2006

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  318. Integrated View of Disruption Dynamics on Internal Electromagnetic and Plasma Structures in the small tokamak HYBTOK-II

    M.Okamoto, S.Takamura,N.Ohno, S.Kajita, Y.Kikuchi, Y.Uesugi, T.Ozeki, Y.Kawano, M.Sugihara

    21st IAEA Fusion Energy Conference, Chengdu, China, Oct.16-21,2006     page: EX/P8-14   2006

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  319. Super Dense Core Plasma due to Internal Diffusion Barrier in LHD

    N.Ohyabu, .Morisaki, S.Masuzaki, R.Sakamoto, M.Kobayashi, J.Miyazawa, M.SHoji, T.Akiyama, N.Ashikawa, M.Emoto, H.Funaba, P.Goncharov, M.Goto, J.H.Harris, Y.Hirooka, K.Ichiguchi, T.Ido, K.Itoh, H.Igami, K.Ikeda, S.Inagaki, H.KAsahara, T.Kobuchi, S.Kubo, R.Kumazawa, S.Morita, S.Muto, K.Nagaoka, N.Nakajima, Y.Nakamura, H.Nakanishi, K.Nariharam Y.Narushima, M.Nishiura, T.Notake, S.Ohdachi, N.Ohno, Y.Oka, M.Osakabe, T.Ozaki, B.J.Peterson, K.Saito, S.Sakakibara, R.Sanchez, H.Sanuki, K.Sato, T.Seki, A.SHimizu, H.SUgama, C.Suzuki, Y.Suzuki, Y.Takeiri, K.Tanaka, N.Tamura, K.TOi, T.Tokuzawa, S.TOda, K.Tsumori, I.Yamada, O.Yamagishi, M.Yokoyama, S.Yoshimura, Y.Yoshimura, M.Yoshinuma, K.Ida, T.Shimozuma, K.Y.Watanabe, Y.Nagayama, O.Kaneko, T.Mutoh, K.Kawahata, H.Yamada, A.Komori, S.Sudo, O.Motojima

    21st IAEA Fusion Energy Conference, Chengdu, China, Oct.16-21, 2006     page: EX/8-1   2006

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  320. Bursty Fluctuation Characterisitics in SOL/Divertor Plasmas of Large Helical Device

    N.Ohno, S.Masuzzaki, V.P.Budaev, H.Miyoshi, S.Takamura, T.Morisaki, N.Ohyabu, A.Komori

    21st IAEA Fusion Energy Conference, Chengdu, China, Oct 16-21, 2006     page: EX/P4-20   2006

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  321. Extended Steady-State and High=beta Regimes of Net-Current Free Heliotron Plasmas in the Large Helical Device

    O.Motojima, H.Yamada, A.Komori, O.Kaneko, K.Kawahata, T.Mito, T.Mutoh, N.Ohyabu K.Ida, S.Imagawa, Y.Nagayama, T.Shimozuma, K.Y.Watanabe, S.Masuzakim J.Miyazawa, S.Morita, S.Ohdachi, N.Ohno, K.Saito, S.Sakakibara, Y.Takeiri, N.Tamura, K.Toi, M.Tokitani, M.Yokoyama, M.Yoshinuma, K.Ikeda, A.Isayama, K.Ishii, S.Kubo, S.Murakami, K.Nagasaki, T.Seki, K.Takahata, H.Takenaga, LHD Experimental Group

    21st IAEA Fusion Energy Conference, Chengdu, China, Oct.16-21. 2006     page: OV/2-1   2006

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  322. Plasma-surface interaction, scrape-off layer and divertor physics: Implications for ITER

    B.Lipschultz, X.Bonnin, A.Kukushkin, A.Leonard, J.Roth, E.Tsitrone, D.Whyte, N.Asakura, D.Coster, G.Counsell, R.Doerner, R.Dux, G.Federici, M.Fenstermacher, W.Fundamenski, P.Ghendrih, A.Hermann, J.Hu, A.Kallenbach, S.Kasheninnikov, K.Krieger, G.Krienev, A.Kreter, B.Kurnaev, B.LaBombard, S.Lisgom A.Loarte, T.Nakano, R.Neu, N.Ohno, H.Pacher, J.Paley, Y.Pan, G.Pautasso, V.Philipps, R.Pitts, V.Riccardo, V.Rohde, D.Rudakov, P.Stangeb, S.Takamura, T.Tanabe, Y.Yang, S.Zhu

    21st IAEA Fusion Energy Confernece, Chnegdu, China, Oct.16-21, 2006     page: IT/1-4   2006

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  323. Effects of transient heat load on tungsten surface having sub-micron helium holes and bubbles

    S.Kajita, N.Ohno, S.Takamura

    33rd EPS Conference on Plasma Phys. Rome, 19-23 June 2006 ECA   Vol. 30I   page: 4.137   2006

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  324. Plasma Response on Penetraton of External Rotating Helical Magnetic Field in HYBTOK-II Tokamak Edge Plasma

    V.P.Budaev, I.M.Pankratov, S.Takamura, N.Ohno, S.Kajita, M.Takagi, H.Matsuno, M.Okamoto, S.Hosoi, Y.Hasebe, T.Yamada, A.Ya.Omelchenko, V.V.Olshansky

    33rd EPS Conference on Plasma Phys. Rome, 19-23 June 2006 ECA   Vol. 30I   page: 4.109   2006

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  325. Intermittency in laboratory and space plasma: comparative study of multifractal statistics

    V.P.Budaev, S.P.Savin, L.M.Zelenyi, S.Takamura, N.Ohno, N.Shevyrev

    33rd EPS Conference of Plasma Phys. Rome, 19-23 June 2006 ECA   Vol. 30I   page: 1.064   2006

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  326. Investigation and Application of the Line Intensity Ratio Method for the Measurement of Electron Density and Temperature

    S.Kajita, T.Hiraishi, N.Ohno, M.Okamoto, T.Nakano, S.Takamura

    13th International Congress on Plasma Physics, Kiev, May 22-26, 2006     page: A151p   2006

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  327. Dynamic Interaction between Disruptive Plasma and Wakk in the Small Tokamak HYBTOK-II

    M.Okamoto, T.Yamada, T.Hiraishi, Y.Kikuchi, N.Ohno, S.Takamura

    17th PSI Conference, Heifei, China, May 22-26, 2006     page: 2-15   2006

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  328. High Density Plasma Generation by RF Ohmic Discharge in Toroidal Divertor Simulator NAGDIS-T

    M.Nagase, H.Matsuda, N.Ohno, S.Takamura, M.Takagi

    17th PSI Conference, Heifei, China, May 22-26, 2006     page: 3-16   2006

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  329. Carbon Dust Formation and Chemical Erosion Process in High Density Deuterium Plasmas in the Linear Divertor Simulator

    Y.Miyachi, M.Yoshimi, N.Ohno, S.Takamura

    17th PSI Conference, Heifei, China, May 22-26, 2006     page: 2-50   2006

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  330. Fundamental study on the control of oxy-combustion by rf non-equilibrium plasma Reviewed

    Y.Osaka, N.Kobayashi, M.A.Razzak, N.Ohno, S.Takamura

    Fluid and heat engineering research   Vol. 41   page: 5-12   2006

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  331. Formation of Nanostructured Tungsten with Arborescent Shape due to Helium Plasma Irradiation Reviewed

    S.Takamura, N.Ohno, D.Nishijima, S.Kajita

    Plasma Fusion Res.   Vol. 1   page: 051(2pages)   2006

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  332. Reduction of Laser Threshold for Melting Tungsten due to Subsurface Helium Holes Reviewed

    S.Kajita, D.Nishijima, N.Ohno, S.Takamura

    J. Appl. Phys.   Vol. 100   page: 103304(10 pages)   2006

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  333. Modification of the Damping Rate of the Oscillation of a Dust Particle levitating in a Plasma Due to the Delayed Charging Effect Reviewed

    M.Y.Pustylnik, N.Ohno, S.Takamura, R.Smirnov

    Phys. Rev. E   Vol. 74   page: 046402(9pages)   2006

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  334. Analysis on Relation between Magnetic Structure and Bursty Fluctuation in SOL/Divertor Plasma of LHD Reviewed

    N.Ohno, S.Masuzaki, H.Miyoshi, S.Takamura, V.P.Budaev, T.Morisaki, N.Ohyabu, A.Komori

    Contrib. Plasma Physics   Vol. 46   page: 692-697   2006

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  335. Numerical Analysis on Generation of High Density Plasmas in the Toroidal Device NAGDIS-T for SOL and Divertor Simulation Studies Reviewed

    M.Nagase, S.Takamura, N.Ohno, H.Masuda, H.Kitahara, M.Takagi

    Contrib. Plasma Physics   Vol. 46   page: 557-562   2006

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  336. Control of Energetic Electron Component in a Magnetically Confined Diffusion Ar Plasma Reviewed

    M.Pustylnik, N.Ohno, S.Takamura

    Japanese Journal of Applied Physics   Vol. 45 ( 2A ) page: 926-932   2006

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  337. Validity of Electron Temperature Measurement by Using Boltzmann Plot Method in Radio Freauency Inductive Discharge in the Atmospheric Pressure Range Reviewed

    N.Ohno, M.Razzak, H.Ukai, S.Takamura, Y.Uesugi

    Plasma Fusion Res.   Vol. 1   page: 028(9pages)   2006

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  338. The Effect of the Rotating Helical Fields on the Plasma Edge in the HYBTOK-II Tokamak Reviewed

    V.P.Budaev, I.M.Pankratov, S.Takamura, N.Ohno, M.Takagi, H.Matsuno, M.Okamoto, S.K.Saha

    Nucl. Fusion   Vol. 46   page: S175-S180   2006

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  339. Fast Ignition and Mode Transition of Radio Frequency Induction Plasmas at Atmospheric Pressure using tungsten Pin Electrode Array Reviewed

    M.Razzak, S.Takamura, N.Ohno

    Plasma Fusion Res.   Vol. 1   page: 006/Letters(3pages)   2006

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  340. Assessment of Meander-Line Antenna covered with Dielectric Material for LHW Heating Reviewed

    H.Matsuno, S.Takamura, S.Hosoi, N.Ohno

    Plasma & Fusion Res.   Vol. 1   page: 0009(6pages)   2006

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  341. Fast Initiation and Mode Transition of Radio Frequency Induction Plasmas at Atmospheric Pressure Using Tungsten Pin Electrodes Array Reviewed International journal

    RAZZAK M. Abdur, TAKAMURA Shuichi, OHNO Noriyasu

    Plasma and Fusion Research   ( 1 ) page: 6 - 6   2006

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    The effects of using an array of tungsten pin electrodes on the ignition dynamics of radio frequency (rf) discharges generated by inductively coupled plasma (ICP) technique at atmospheric pressure are investigated experimentally. The experimental observations reveal that the array of tungsten pin electrodes successfully enhance the initial discharges maintained by the strong electrostatic field with stable and fast ignition, which enables us to sustain efficient rf induction plasmas at atmospheric pressure range.

    DOI: 10.1585/pfr.1.006

  342. Validity of Electron Temperature Measurement by Using Boltzmann Plot Method in Radio Frequency Inductive Discharge in the Atmospheric Pressure Range Reviewed International journal

    OHNO Noriyasu, RAZZAK M. Abdur, UKAI Hiroshi, TAKAMURA Shuichi, UESUGI Yoshihiko

    Plasma and Fusion Research   ( 1 ) page: 28 - 28   2006

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    The validity of electron temperature measurement using the Boltzmann plot method was investigated in a radio frequency (rf) inductive discharge in the atmospheric pressure range. Since the Boltzmann plot method requires local thermal equilibrium (LTE), the parameter regions of electron temperature and electron density, in which the Boltzmann plot method is applicable, were analyzed in terms of a comparison of the spontaneous emission and collisional excitation to the excited states. It is observed that in our rf-inductive plasma near the atmospheric pressure range the Boltzmann plot method does not provide an exact measurement of electron temperature because of relatively low electron density, which does not satisfy the calculation criteria. An alternative method employing a combination of the Stark broadening measurement and the Saha-Boltzmann equation was demonstrated to more accurately determine the plasma parameters (electron temperature and electron density).

    DOI: 10.1585/pfr.1.028

  343. High-Z Dust Generation on Tungsten Surfaces due to Synergetic Erosion of Deuterium/Helium Plasma Exposures Reviewed

    西島 大, 天野 浩嗣, 大野 哲靖, 吉田 直亮, 高村 秀一

    プラズマ・核融合学会誌 = Journal of plasma and fusion research   Vol. 81 ( 9 ) page: 703 - 707   2005.9

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    Low-energy and high-flux plasma exposures on tungsten surfaces result in blister/hole formation. Subsequent He plasma exposure at 2,000 K on the blister-rich surface forms a hole structure on the surface, including the blister surface, and some blisters collapse due to recrystallization and bubble formation on the blister skin. Grain ejections were observed after deuterium plasma exposure at 550 K on a W surface on which a hole structure had formed due to He pre-exposure at 1,600 K.

    DOI: 10.1585/jspf.81.703

  344. Efficient Radio Frequency Inductive Discharges in Near Atmospheric Pressure Using Immittance Conversion Topology Reviewed

    Razzak M. Abdur, 高村 秀一, 上杉 喜彦, 大野 哲靖

    プラズマ・核融合学会誌 = Journal of plasma and fusion research   Vol. 81 ( 3 ) page: 204 - 211   2005.3

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    A radio frequency (rf) inductive discharge in atmospheric pressure range requires high voltage in the initial startup phase and high power during the steady state sustainment phase. It is, therefore, necessary to inject high rf power into the plasma ensuring the maximum use of the power source, especially where the rf power is limited. In order to inject the maximum possible rf power into the plasma with a moderate rf power source of few kilowatts range, we employ the immittance conversion topology by converting a constant voltage source into a constant current source to generate efficient rf discharge by inductively coupled plasma (ICP) technique at a gas pressure with up to one atmosphere in argon. A novel T-LCL immittance circuit is designed for constant-current high-power operation, which is practically very important in the high-frequency range, to provide high effective rf power to the plasma. The immittance conversion system combines the static induction transistor (SIT)-based radio frequency (rf) high-power inverter circuit and the immittance conversion elements including the rf induction coil. The basic properties of the immittance circuit are studied by numerical analysis and verified the results by experimental measurements with the inductive plasma as a load at a relatively high rf power of about 4 kW. The performances of the immittance circuit are also evaluated and compared with that of the conventional series resonance circuit in high-pressure induction plasma generation. The experimental results reveal that the immittance conversion circuit confirms injecting higher effective rf power into the plasma as much as three times than that of the series resonance circuit under the same operating conditions and same dc supply voltage to the inverter, thereby enhancing the plasma heating efficiency to generate efficient rf inductive discharges.

    DOI: 10.1585/jspf.81.204

  345. Characteristic changes of deuterium retention on tungsten surfaces due to low-energy helium plasma pre-exposure Reviewed

    Nishijima D, Sugimoto T, Iwakiri H, Ye MY, Ohno N, Yoshida N, Takamura S

    JOURNAL OF NUCLEAR MATERIALS   Vol. 337 ( 1-3 ) page: 927 - 931   2005.3

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    DOI: 10.1016/j.jnucmat.2004.10.011

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  346. Hydrogen Blister Formation on Cold-Worked Tungsten with Layered Structure Reviewed

    D.Nishijima, T.Sugimoto, M.Ye, N.Ohno, S.Takamura

    Jpn. J. Appl. Phys.   Vol. 44 ( 1A ) page: 380-382   2005

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  347. Further Roughing of Tungsten Surface due to Transient Heat Load by Laser Irradiation during Helium Plasma Exposure Reviewed

    S.Kajita, D.Nishijima, N.Ohno, S.Takamura

    J. Plasma Fusion Res.   Vol. 81   page: 745-746   2005

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  348. High-Z Dust Generation on Tungsten Surface due to Synergetic Erosion of Deuterium/Helium Plasma Exposure Reviewed

    D.Nishijima, K.Amano, N.Ohno, N.Yoshida, S.Takamura

    J. Plasma Fusion Res.   Vol. 81   page: 703-707   2005

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  349. Suppression of Blister Formation and Deuterium Retention on Tungsten Surface due to Mechanical Polishing and Helium Pre-exposure Reviewed

    D.Nishijima, H.Iwakiri, K.Amano, M.Y.Ye, N.Ohno, K.Tokunaga, N.Yoshida, S.Takamura

    Nucl. Fusion   Vol. 45   page: 669-674   2005

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  350. Efficient Radio Frequency Inductive Discharge in Hear Atmospheric Pressure Using Imittance Conversion Topology Reviewed

    M.A.Razzak, S.Takamura, Y.Uesugi, N.Ohno

    J. Plasma Fusion Res.   Vol. 81 ( 3 ) page: 204-211   2005

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  351. Characterstic changes of deuterium rentention on tungsten surfaces due to low-energy helium plasma pre-exposure Reviewed

    D.Nishijima, T.Sugimoto, H.Iwakiri, M.Y.Ye, N.Ohno, N.Yoshida, S.Takamura

    Journal of Nuclear Materials   Vol. 337-339   page: 927-931   2005

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  352. Carbon dust formation from re-deposited layers in high-density hydrogen/helium plasmas in the NAGDIS-II device Reviewed

    N.Ohno, Y.Kobayashi, T.Sugimoto, S.Takamura

    Journal of Nuclear Materials   Vol. 337-339   page: 35-39   2005

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  353. Neutral helium line emission for edge plasma conditions Reviewed

    F.B.Rosmej, R.Stamm, S.Fritzsche, H.Capes, M.Koubiti, Y.Marandet, V.S.Lisitsa, N.Ohno, S.Takamura, D.Nishijima

    Journal of Nuclear Materials   Vol. 337-339   page: 1101-1105   2005

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  354. Formation mechanism of bubbles and holes on tungsten surface with low-energy and high-flux helium plasma irradiation in NAGDIS-II Reviewed

    Dai. Nishijima, M.Y.Ye, N.Ohno, S.Takamura

    J. Nucl. Mater.   Vol. 329-333   page: 1029-1033   2005

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  355. Micron-Bubble Formation on Polycrystal Tungsten due to Low-Energy and high-Flux Helium Plasma Exposure Reviewed

    D.Nishijima, M.Miyamoto, H.Iwakiri, M.Ye, N.Ohno, K.Tokunaga, N.Yoshida, S.Takamura

    Nuclear Fusion   Vol. 46   page: 561-564   2005

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  356. Overview of JT-60U progress towards steady-state advanced tokamak Reviewed

    S.Ide, N.Ohno, JT-60U Team

    Nuclear Fusion   Vol. 45   page: S48-S62   2005

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  357. Transition from electrostatic-to-electromagnetic mode in a radio-frequency Ar inductively coupled plasma in atmospheric pressure Reviewed International journal

    Razzak MA, Kondo K, Uesugi Y, Ohno N, Takamura S

    JOURNAL OF APPLIED PHYSICS   Vol. 95 ( 2 ) page: 427 - 433   2004.1

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    DOI: 10.1063/1.1635650

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  358. Proposal of Modeified Child-Langmuir Formula Describing Space-Charge Limited Current in Plasma Reviewed

    Y.Hagino, N.Ohno, S.Takamura

    Contrib. Plasma Phys.   Vol. 44 ( 1-3 ) page: 144-149   2004

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  359. Visualization of Intermittent Blobby Plasma Transport in Attached and Detached Plasmas of the NAGDIS-II Reviewed

    N.Ohno, K.Furuta, S.Takamura

    J. Plasma Fusion Res.   Vol. 80 ( 4 ) page: 275-276   2004

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  360. Moving-Surface Plasma-Facing Components for Particle Control in Steady State Magnetic Fusion Devices Reviewed

    Y.Hirooka, H.Fukushima, N.Ohno, S.Takamura

    Fusion Science and Technology   Vol. 45   page: 60-64   2004

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  361. Reconstruction of Velocity Distribution of density Bursts by Wavelet Analysis in the Linear Divertor Simulator NAGDIS-II Reviewed

    N.Ohno, V.P.Budaev, K.Furuta, H.Miyoshi, S.Takamura

    Contrib. Plasma Phys.   Vol. 44 ( 1-3 ) page: 222-227   2004

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  362. Space-Charge Limited Current from Plasma-Facing Material Surface Reviewed

    S.Takamura, N.Ohno, M.Y.Ye, T.Kuwabara

    Contrib. Plasma Phys.   Vol. 44 ( 1-3 ) page: 126-137   2004

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  363. Proposal of modified Child-Langmuir formula describing space-charge limited current in plasma Reviewed International journal

    Hagino Y, Ohno N, Takamura S

    CONTRIBUTIONS TO PLASMA PHYSICS   Vol. 44 ( 1-3 ) page: 144 - 149   2004

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    DOI: 10.1002/ctpp.200410019

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  364. 非接触再結合プラズマ中の揺動特性 Reviewed

    大野哲靖、田中直行、高村秀一

      Vol. 7 ( 10 ) page: 1093-1101   2003

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  365. Transition from Electrostatic to Electromagnetic Mode in a Radio Frequency Ar Induction Plasma in Atmospheric Pressure Reviewed

    M.A.Razzak, K.Kondo, Y.Uesugi, N.Ohno, S.Takamura

    J. Appl. Phys.   Vol. 95 ( 2 ) page: 427-433   2003

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  366. Intermittent structures in the high field side boundary of the HYBTOK-II tokamak Reviewed

    V.P.Budaev, S.Takamura, Y.Kikuchi, Y.Uesugi, N.Ohno

    Czechoslovak Journal of Phys   Vol. 53 ( 10 ) page: 863-868   2003

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  367. Formation and dynamics of very deep negative potential well in the small tokamak device CSTN-IV Reviewed

    H.Kojima, Y.Fukuzawa, T.Manabe, S.Takamura, T.Okada, N.Ohno

    Czechoslovak Journal of Phys.   Vol. 53 ( 10 ) page: 895-902   2003

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  368. プラズマと接する固体表面からの空間電荷制限放出電流 Reviewed

    高村秀一、大野哲靖

    放電研究   Vol. 46 ( 3 ) page: 2-22   2003

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  369. Proof of principle experiments on the concept of moving-surface plasma-facing components-hydrogen recycling over a titanium-gettered ratating drum Reviewed

    Y.Hirooka, H.Fukushima, N.Ohno, S.Takamura

    Fusion Engineering and Design   Vol. 6   page: 413-421   2003

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  370. Blister formation on tungsten surface under low energy and high flux hydrogen plasma irradiation in NAGDIS-I Reviewed

    M.Y.Ye, H.Kanehara, S.Fukuta, N.Ohno, S.Takamura

    Journal of Nuclear Materials   Vol. 313-316   page: 72-76   2003

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  371. Incident ion energy dependence of bubble formation on tungsten surface with low energy and high flux helium plasma irradiation Reviewed

    D.Nishijima, M.Y.Ye, N.Ohno, S.Takamura

    Journal of Nuclear Materials   Vol. 313-316   page: 97-101   2003

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  372. Experimental evaluation of space charge limited emission current from tungstn surface in high density helium plasma Reviewed

    Y.Hagino, N.Ohno, S.Takamura, M.Y.Ye

    Journal of Nuclear Materials   Vol. 313-316   page: 675-678   2003

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  373. Ion temperature measurement using an ion sensitie probe in the LHD divertor Reviewed

    N.Ezumi, S.Masuzaki, N.Ohno, Y.Uesugi, S.Takamura, LHD Experimental Group

    Journal of Nuclear Materials   Vol. 313-316   page: 696-700   2003

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  374. High-quality video streaming system for plasma diagnostics using super SINET Reviewed

    M.Emoto, K.Watanabe, S.Masuzaki, N.Ohno, H.Okade

    Rev. Sci. Instrum.   Vol. 74   page: 1766   2003

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  375. Self-consistent dusty sheaths in plasmas with two-temperature electrons Reviewed

    Yu.I.Chutov, O.Kravchenko, A.Pshenychnyj, R.Smirnov, K.Asano, N.Ohno, S.Takamura, Y.Tomita

    Physics of Plasmas   Vol. 10 ( 2 ) page: 546-552   2003

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  376. Fluctuation Characteristics in Detached Recombining Plasmas

    N.Ohno, N.Tanaka, S. Takamura, V.Budaev

    AIP Conference Proceedings   Vol. 669   page: 240-243   2003

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  377. Edge Plasma Turbulence in Fusion Devices: Bursty Behavior and Fractal Properties

    V.P.Budaev, S.Takamura, N.Ohno, A.Komori, S.Masuzaki, G.S.Kirnev, S.A.Grashin

    30th EPS Conference on Contr. Fusion and Plasma Phys., St. Petersburg, 7-11 July 2003 ECA   Vol. 27A   page: 3.174   2003

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  378. Intermittent Structures in the High Field Side Boundary of the HYBTOK-II Tokamak

    V.P.Budaev, S.Takamura, Y.Kikuchi, Y.Uesugi, N.Ohno

    30th EPS Conference on Contr. Fusion and Plasma Phys., St. Petersburg, 7-11 July 2003 ECA   Vol. 27A   page: 3.173   2003

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  379. Surface Morphology of Tungsten Irradiated by Low-Energy and High-Flux Steady State Helium Plasma

    D.Nishijima, M.Y.Ye, N.Ohno, S.Takamura

    30th EPS Conference on Contr. Fusion and Plasma Phys., St.Petersburg, 7-11 July 2003 ECA   Vol. 27-A   page: 2.163   2003

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  380. Structural Dynamics of Deep Negative Potential Well Formation in Small Tokamak Device CSTN-IV

    H.Kojima, Y.Fukuzawa, T.Manabe, N.Ohno, S.Takamura

    30th EPS Conference on Contr. Fusion and Plasma Phys., St.Petersburg, 7-11 July 2003 ECA   Vol. 27A   page: 2.130   2003

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  381. Experimental Observation and Statistical Analysis of Density Bursts in the Linear Divertor Simulator NAGDIS-II

    N.Ohno, K.Furuta, H.Miyoshi, S.Takamura, V.P.Budaev

    30th EPS Conference on Contr. Fusion and Plasma Phys., St. Petersburg, 7-11 July 2003 ECA   Vol. 27A   page: 2.154   2003

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  382. Influence of the Ion Beam on the Behavior of Dust Particles Trapped in an Ion Sheath

    T.Murakami, M.Sawai, T.Misawa, N.Ohno, S.Takamura

    AIP Conference Proceedings   Vol. 669   page: 101-104   2003

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  383. Sound Wave Propagation in Gases at Low Pressure

    T.Tonogaki, N.Ohno, S.Takamura, A.Tsushima

    AIP Conference Proceedings   Vol. 669   page: 113-116   2003

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  384. 25aA28P Statistical analysis of fluctuation property in edge plasmas of the LHD Reviewed

    MIYOSHI Hideaki, TAKAMURA Shuichi, OHNO Noriyasu, MASUZAKI Suguru, KOMORI Akio, Budaev V.P.

      ( 20 )   2003

  385. 28aA17P Influence of Energetic Electron Components on Unstable Oscillation of Dust Particles Trapped in Plasma-Sheath Boundary Reviewed

    KOBAYASHI Atsuhiro, IMASATO Kae, OHNO Noriyasu, TAKAMURA Shuichi

      ( 20 )   2003

  386. 27pB22P Fluctuation Analysis in Detached and Attached Plasmas Reviewed

    Furuta K., Ohno N., Takamura S.

      ( 20 )   2003

  387. 26aA40P Formation of Deep Potential Well by Electrode Biasing in Tokamak Device Reviewed

    FUKUZAWA Yuma, KOJIMA Hiroki, OKADA Takahiro, OHNO Noriyasu, TAKAMURA Shuichi, IGUCHI Tetsuo

      ( 20 )   2003

  388. 25aB37P Construction of High Heat Flux Toroidal Divertor Plasma Simulator Reviewed

    Sora Shigeki, Kitahara Hiroyoshi, Ohno Noriyasu, Uesugi Yoshihiko, Takamura Shuichi

      ( 20 )   2003

  389. 25aB11P Blister Formation on Low-Temperature Refractory Metal Surface under Low Energy and High Flux Hydrogen Plasma Irradiation Reviewed

    SUGIMOTO Takanori, OHNO Noriyasu, TAKAMURA Shuichi

      ( 20 )   2003

  390. Generation and characteristics of a detached recombining plasma and its dynamic behaviour-a bridge between fusion plasmas and low-temperature ionized gases Reviewed International journal

    Takamura S, Ohno N, Nishijima D, Uesugi Y

    PLASMA SOURCES SCIENCE & TECHNOLOGY   Vol. 11 ( 3A ) page: A42 - A48   2002.8

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  391. Proposal of Flexible Atomic and Molecular Process Management for Monte Carlo Impurity Transport Code Based on Object Oriented Method Reviewed

    K.Asano, N.Ohno, S.Takamura

    Contrib. Plasma Physics   Vol. 42   page: 157-162   2002

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  392. Generation and characteristics of detached recombining plasma and its dynamic behaviour - a bridge between fusion plasmas and low-temperature ionized gases Reviewed

    S.Takamura, N.Ohno, D.Nishijima, Y.Uesugi

    Plasma Sources Sci. Technol.   Vol. 11 ( 3A ) page: A42-A4   2002

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  393. Response to Comment on "Dynamic Behaviours of Dust Particles in the Plasma Sheath Boundary" Reviewed

    S.Takamura, N.Ohno, T.Misawa, S.Nunomura

    Physics of Plasmas   Vol. 9   page: 1060-1061   2002

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  394. Characteristics of Detached Plasmas Associated with Electron-Ion and Molecular Assisted Recombination in NAGDIS-II Reviewed

    D.Nishijima, U.Wenzel, K.Ohsumi, N.Ohno, Y.Uesugi, S.Takamura

    Plasma Physics Controlled Fusion   Vol. 44   page: 597-610   2002

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  395. Parametric Excitation of a Dust Particle Trapped in a Plasma-Sheath Boundary Reviewed

    N.Ohno, M.Sawai, T.Misawa, K.Asano, S.Takamura

    Physica Scripta   Vol. T98   page: 81-86   2002

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  396. Analysics of Detached Recombining Plasmas by Collisional-Radiative Model with Energetic Electron Component Reviewed

    N.Ohno, M.Motoyama, S.Takamura

    Contrib. Plasma Physics   Vol. 42   page: 419-424   2002

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  397. Heat Pulse in a Simulated Divertor Plasmas

    Y.Uesugi, S.Takamura, K.Ohsumi, N.Ohno, D.Nishijima

    29th EPS Conference on Contr. Fusion and Plasma Phys., Montroux, Switzerland, 17-21 June 2002 ECA   Vol. 26B   page: 1.087   2002

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  398. 26aB13P Tungsten Surface Irradiated by Low Energy and High Flux Helium Plasma Reviewed

    Nishijima D., Ye M.Y., Ohno N., Takamura S.

      ( 19 )   2002

  399. Analysis of detached recombining plasmas by collisional-radiative model with energetic electron component Reviewed International journal

    Ohno N, Motoyama M, Takamura S

    CONTRIBUTIONS TO PLASMA PHYSICS   Vol. 42 ( 2-4 ) page: 419 - 424   2002

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  400. 28pB09 Experimental Evaluation of Space-Charge Limited Emission Current from Tungsten Surface in High Density Helium Plasma Reviewed

    HAGINO Yoshiharu, YE Minyou, OHNO Noriyasu, TAKAMURA Shuichi

      ( 19 )   2002

  401. 26pA07 Thermoelectron Emission from a Small Electrode heated with Plasma Heat Flux in AC Tokamak Discharge Reviewed

    MANABE Toshiharu, KOJIMA Hiroki, FUKUZAWA Yuma, OHNO Noriyasu, TAKAMURA Shuichi

      ( 19 )   2002

  402. 26aB18P Proof-of-principle experiments on the concept of particle control by moving-surface plasma-facing components Reviewed

    HIROOKA Yoshi, FUKUSHIMA Houju, OHNO Noriyasu, TAKAMURA Shuichi

      ( 19 )   2002

  403. Dusty sheaths in plasmas with two-temperature electrons Reviewed International journal

    Asano K, Chutov YI, Kravchenko OY, Ohno N, Pshenychnyj AF, Smirnov RD, Takamura S

    DUSTY PLASMAS IN THE NEW MILLENNIUM   Vol. 649   page: 277 - 280   2002

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  404. Simulation Experiments on Erosion and Redeposition of High - Z Materials in a Linear Plasma Device Reviewed

    OHNO Noriyasu, TAKAMURA Shuichi

    Journal of plasma and fusion research   Vol. 77 ( 9 ) page: 864 - 868   2001.9

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    Erosion and redeposition processes of molybdenum, a high-Z material, were investigated in the linear plasma device TPD-I. Comparison between the experimental results and numerical analysis with a 3D Monte Carlo simulation code indicated that the observed erosion profile could be explained by taking account of the effect of prompt redeposition of high-Z material.

  405. Dynamic behavior of detached recombining plasmas during ELM-like plasma heat pulses in the divertor plasma simulator NAGDIS-II Reviewed International journal

    Uesugi Y, Hattori N, Nishijima D, Ohno N, Takamura S

    JOURNAL OF NUCLEAR MATERIALS   Vol. 290   page: 1134 - 1137   2001.3

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  406. Experimental Observation of Vertically Polarized Transverse Dust Lattice Wve Propagating in a One Dimensional Strongly Coupled Dust Chain Reviewed

    T.Misawa, N.Ohno, K.Asano, M.Sawai, S.Takamura, P.K.Kaw

    Physcal Review Letters   Vol. 86 ( 7 ) page: 1219-1222   2001

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  407. Evaluation of Electron Teperature in Detached Recombining Plasma Reviewed

    D.Nishijima, U.Wenzel, M.Motoyama, N.Ohno, S.I.Krasheninnikov, S.Takamura

    Journal of Nuclear Materials   Vol. 290-293   page: 688-691   2001

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  408. *Static and Dynamic Behavior of Plasma Detachment in the Divertor Simulator Experiment NAGDIS-II Reviewed

    N.Ohno, D.Nishijima, S.Takamura, Y.Uesugi, M.Motoyama, N.Hattori, H.Arakawa, N.Ezumi, S.Krasheninnikov, A.Pigarov, U.Wenzel

    Nuclear Fusion   Vol. 41 ( 8 ) page: 1055-1065   2001

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  409. 小特集「プラズマ対向面での損耗・再堆積研究の進展」3.直線型プラズマ装置を用いた高融点金属材料の損耗・再堆積モデル実験

    大野哲靖、高村秀一

    プラズマ・核融合学会誌   Vol. 77 ( 9 ) page: 864-868   2001

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  410. Influence of Plasma Resistance and Fluctuation on Probe Characeteristics in Detached Recombining Plasmas Reviewed

    N.Ohno, N.Tanaka, N.Ezumi, D.Nishijima, S.Takamura

    Contib. Plasma Physics   Vol. 41   page: 473-480   2001

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  411. Static and Dynamic Behaviors of Detached Plasma in Divertor Simulator NAGDIS-II Reviewed

    S.Takamura, N.Ohno, Y.Uesugi, D.Nishijima, K.Ohsumi, M.Motoyama, N.Hattori, N.Ezumi, S.Krasheninnikov, A.Pigarov, U.Wenzel

    Journal of Plasma and Fusion Research SERIES   Vol. 4   page: 138-145   2001

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  412. Dynamic Behaviors of Dust Particles in the Plasma-Sheath Boundary Reviewed

    S.Takamura, T.Misawa, N.Ohno, S.Nunomura, M.Sawai, K.Asano, P.K.Kaw

    Physics of Plasmas   Vol. 8 ( 5 ) page: 1886-1892   2001

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  413. プラズマと接する固体表面からの空間電荷制限電流 Reviewed

    桑原竜弥、大野哲靖、高村秀一、叶民友

      Vol. 77 ( 5 ) page: 464-475   2001

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  414. Evidence for the Importance of Radial Transport in Plasma Detacment in the Nagoya University Divertor Simulator(NAGDIS-II) Reviewed

    E.M.Hollmann, D.G.Whyte, D.Nishijima, N.Ohno, Y.Uesugi, N.Ezumi

    Physics of Plasmas   Vol. 8 ( 7 ) page: 3314-3320   2001

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  415. Modifications of Tungsten Surface under Low Ionic Energy and High Flux Plasma Irradiation

    K.Moriguchi, S.Fukuta, M.Y.Ye, N.Ohno, S.Takamura

    Proc. of XXV International Conference on Phenomena in Ionized Gases, Nagoya, Japan     page: 83-84   2001

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  416. Dynamic Response of Detached Recombining Plasmas to ELM-Like Plasma Heat Pulse Produced by RF Heating

    K.Ohsumi, D.Nishijima, N.Ohno, Y.Uesugi, S.Takamura

    Proc. of XXV International Conference on Phenomena in Ionized Gases, Nagoya, Japan     page: 195-196   2001

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  417. Influence of Supra-Thermal Electrons on Propagation of Transverse Dust Lattice Wave

    T.Misawa, K.Asano, M.Sawai, N.Ohno, S.Takamura

    Proc. of XXV International Conference on Phenomena in Ionized Gases, Nagoya, Japan     page: 65-66   2001

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  418. MD Particle Simulation on Dust Lattice Wave

    K.Asano, T.Misawa, N.Ohno, S.Takamura, S.Vladimirov

    Proc. of XXV International Conference on Phenomena in Ionized Gases, Nagoya, Japan     page: 61-62   2001

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  419. Fluctuations in Detached Recombining Plasmas

    N.Tanaka, N.Ohno, S.Takamura

    Proc. of XXV International Conference on Phenomena in Ionized Gases, Nagoya, Japan     page: 345-346   2001

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  420. 27aA01 [招待講演]非接触プラズマにおける再結合過程とその動的応答(プラズマ基礎・応用) Reviewed

    大野 哲靖, 高村 秀一, 上杉 喜彦, 西島 大輔, 大住 光一, 田中 直行, 嶋崎 弘志

    プラズマ・核融合学会年会予稿集   ( 18 )   2001

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  421. 30pA17P Ion Temperature Measurement using an Ion Sensitive Probe in PSI-2 Reviewed

    EZUMI Naomichi, OHNO Noriyasu, TAKAMURA Shuichi, KATSUMATA Itsuo, MASUZAKI Suguru, Kiss'ovski Zh., Bohmeyer W., Fussmann G.

      ( 18 )   2001

  422. 29pA20P Proof of Principle Experiment on Particle Control with Moving-Belt Plasma Facing Component Reviewed

    Fukushima Hoju, Hirooka Yoshihiko, Ohno Noriyasu, Takamura Shyuichi

      ( 18 )   2001

  423. 28aB15P Dynamic Response of Detached Recombining Plasmas to ELM-Like Heat Pulse Produced by Whistler Wave Reviewed

    OSUMI Koichi, NISHIJIMA Daisuke, OHNO Noriyasu, UESUGI Yoshihiko, TAKAMURA Shuichi

      ( 18 )   2001

  424. 27pA12P Measurements of Fluctuations in Detached Recombining Plasmas (2) Reviewed

    Tanaka N., Ohno N., Takagi M., Takamura S., Budaev V.

      ( 18 )   2001

  425. 27pA11P Analysis of dynamic behaviors of detached plasmas by time-dependent collisional radiative code and nuid code Reviewed

    SHIMAZAKI Hiroshi, OHNO Noriyasu, TAKAMURA Shuichi

      ( 18 )   2001

  426. The Plasma Boudary of Magnetic Fusion Devices Reviewed

      Vol. 76 ( 10 )   2000.10

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  427. Detached Recombining Plasmas in relation to Volumetric Hydrogen Recycle in Hydrogen Recycling at Plasma Facing Materials, ed. by C.H.Wu

    S.Takamura, N.Ohno, N.Ezumi, D.Nishijima, S.I.Krasheninnikov, A.Yu. Pigarov

    NATO Science Series, II. Mathematics, Physics and Chemistry, Vol. 1, Kluwer Academic Publishers   Vol. 1   page: 59-66   2000

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  428. Fundamental Processes of Plasma Heat Flow through Sheaths to Material Surfaces in Recent Research Development in Plasmas Vol.1-2000

    S.Takamura, M.Y.Ye, N.Ohno, Y.Uesugi

    Transworld Research Network, 2000, pp.41-64     page: 41-64   2000

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  429. Fundamental Process of Plasma Heat Flow through Sheaths to Material Surfaces in Recent Research Development in Plasmas Reviewed

    S.Takamura, M.Y.Ye, N.Ohno, Y.Uesugi

    Transworld Research Network     page: 41-64   2000

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  430. Dynamic Behavior of Detached Recombining Plasmas during ELM-like Plasma Heat Pulse in the Diverotr Plasma Simulator NAGDIS-II Reviewed

    Y.Uesugi, N.Hattori, D.Nishijima, N.Ohno, S.Takamura

    Journal of Nuclear Materials   Vol. 290-293   page: 1134-1137   2000

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  431. Effects of Condensible Impurities on the Erosion Behavior of the Plasma-Facing Materials Reviewed

    N.Ohno, S.Uno, Y.Hirooka, S.Takamura

    Journal of Nuclear Materials   Vol. 290-293   page: 299-302   2000

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  432. 低ガス圧プラズマにおけるクーロン結晶の生成と浮遊位置制御 Reviewed

    三沢達也、布村正太、浅野和仁、大野哲靖、高村秀一

    電気学会論文誌A   Vol. 120-A ( 2 ) page: 180-185   2000

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  433. Modifications of Tungsten Surface Irradiated by Low Energy and High Flux Helium Plasma Reviewed

    M.Y.Ye, S.Fukuta, N.Ohno, S.Takamura, K.Tokunaga, N.Yoshida

    Journal of Plasma and Fusion Research SERIES   Vol. 3   page: 265-269   2000

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  434. 2-D PIC Simulation on Space-Charge Limited Emission Current from Plasma-Facing Components Reviewed

    K.Asano, N.Ohno, M.Y.Ye, S.Fukuta, S.Takamura

    Contib. Plasma Physics   Vol. 40   page: 478-483   2000

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  435. Dynamic Behavior of Detached Recombining Plasmas for Plasma Heat Pulse in the Diverotr Simulator NAGDIS-II Reviewed

    N.Ohno, D.Nishijima, M.Motoyama, N.Hattori, Y.Uesugi, S.Takamura, U.Wenzel

    Journal of Plasma and Fusion Research SERIES   Vol. 3   page: 202-205   2000

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  436. Application of Strongly Ionized AC Tokamak Plasma for Synthesis of TiN Thin Films Reviewed

    M.Y.Ye, O.Matsuda, N.Ohno, Y.Uesugi, M.Takagi, S.Takamura

    Vacuum   Vol. 59   page: 55-62   2000

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  437. Observation of Transverse Dust Lattice Wave Excited by Unstable Vertical Oscillations of Dust Particles in an Ion Sheath with Low Gas Pressure Reviewed

    T.Misawa, S.Nunomura, N.Ohno, S.Takamura

    Japan Journal of Applied Physics   Vol. 39   page: L511-L553   2000

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  438. Detached Recombining Plasmas in relation to Volumetric Hydrogen Recycle Reviewed

    S.Takamura, N.Ohno, N.Ezumi, D.Nishijima, S.I.Krasheninnikov, A.Yu.Pigarov

    Hydrogen Recycling at Plasma Facing Materials, ed. by Ch.H.Wu, NATO Science Series, II. Mathematics, Physics and Chemistry, Kluwer Academic Pubilishers   Vol. 1   page: 59-66   2000

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  439. Dynamic Behaviors of Dust Particles in the Plasma-Sheath Boundary

    S.Takamura, T.Misawa, N.Ohno, S.Nunomura, M.Sawai, K.Asano, P.K.Kaw

    42nd Annual Meeting of the Division of Plasma Physics of the American Physical Society, combined with ICPP2000, Quebec, Canada   Vol. 1   2000

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  440. Recombination Plasmas in the ASDEX Upgrade Divertor and the Divertor Simulator NAGDIS-II

    U.Wenzel, R.Pugno, K.Schmidtmann, N.Hattori, D.Nishijima, N.Ohno, S.Takamura, Y.Uesugi

    Proc. of 27th EPS Conf. on Controlled Fusion and Plasma Physics, Budapest, Hungary   Vol. 24B   page: 1192-1195   2000

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  441. Bubble Formation in Tungsten Surface during Low Energy and High Flux Helium/Hydrogen Plasma Irradiation

    M.Y.Ye, S.Fukuta, N.Ohno, S.Takamura

    Proc. of Japan/US Workshop(00FT5-1) on High Heat Flux Components and Plasma Surface Interactions for Next Fusion Devices, Osaka, Japan   Vol. 1   page: 288-298   2000

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  442. 2-D PIC simulation on space-charge limited emission current from plasma-facing components Reviewed

    Asano K, Ohno N, Ye MY, Fukuta S, Takamura S

    CONTRIBUTIONS TO PLASMA PHYSICS   Vol. 40 ( 3-4 ) page: 478 - 483   2000

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  443. 27pA10P Radial Profile Measurement of Detached Plasma in Divertor Plasma Simulator NAGDIS-II Reviewed

      ( 17 )   2000

  444. 27pA08P Measurements of Fluctuations in Detached Recombining Plasmas Reviewed

      ( 17 )   2000

  445. Dynamic Response of Dust Particles trapped in a Plasma-Sheath Boundary to External Forced Oscillation (2) Reviewed

    Sawai M., Misawa T., Ohno N., Takamura S.

    Meeting Abstracts of the Physical Society of Japan   Vol. 55 ( 0 )   2000

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    DOI: 10.11316/jpsgaiyo.55.2.2.0_186_2

  446. 2-D PIC Simulation on Space-Change Limited Emission Current from Plasma-Facing Components Reviewed

    Asano K., Ohno N., Ye M. Y., Fukuta S., Takamura S.

    Meeting Abstracts of the Physical Society of Japan   Vol. 55 ( 0 )   2000

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    DOI: 10.11316/jpsgaiyo.55.1.2.0_172_4

  447. Dynamic Response of Dust Particles Trapped Reviewed

    Sawai M., Misawa T., Ohno N., Takamura S.

    Meeting Abstracts of the Physical Society of Japan   Vol. 55 ( 0 )   2000

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    DOI: 10.11316/jpsgaiyo.55.1.2.0_151_4

  448. Recent Topics in Experiments. Molecular Activated Recombination Processes in Divertor Plasmas Reviewed

    OHNO Noriyasu

    Journal of Plasma and Fusion Research   Vol. 75 ( 10 ) page: 1162 - 1168   1999.10

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    Molecular processes in detached divertor plasmas, especially molecular activated recombination processes, are briefly reviewed. Several reaction chains related to the volumetric recombination process, that are associated with the vibrationally excited hydrogen molecule are explained. Experimental observations of the molecular activated recombination are also reported.

    DOI: 10.1585/jspf.75.1162

  449. CD-ROM Study on Plasma Dynamics Using Scientific Animation II Reviewed

      Vol. 75 ( 10 )   1999.10

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  450. PSI in Fusion Devices Edge Plasma Physics and Atomic-Molecular Processes Reviewed

    OHNO Noriyasu

    Journal of Plasma and Fusion Research   Vol. 75 ( 4 ) page: 378 - 383   1999.4

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    Edge plasma physics and atomic-molecular processes relating to plasma heat flow to material surfaces are discussed. The local heat flow was found to be enhanced by a thermal contraction induced by cross-field potential variation in a plasma, resulting in hot spot formation on the plasma-facing materials due to nonlinear thermal bifurcation induced by thermoelectron emission. Also examined is the recombination enhancement due to the vibrationally excited hydrogen molecule generated from material surfaces in detached plasma with molecular activated recombination.

    DOI: 10.1585/jspf.75.378

  451. Hot spot formation on electron-emissive target plate with plasma potential variation across magnetic field Reviewed International journal

    Ye MY, Kudose K, Kuwabara T, Ohno N, Takamura S

    JOURNAL OF NUCLEAR MATERIALS   Vol. 266   page: 742 - 746   1999.3

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    Web of Science

  452. 小特集「プラズマ原子・分子過程の展望」5.最近の実験的なトピックス 5.1ダイバータプラズマ中の分子活性化再結合過程

    大野哲靖

    プラズマ・核融合学会誌   Vol. 75 ( 10 ) page: 1162-1168   1999

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  453. Hot Spot Formation on Electron-Emissive Target Plate with Plasma Potential Variation acoss Magnetic Field Reviewed

    M.Y.Ye, K.Kudose, T.Kuwabara, N.Ohno, S.Takamura

    Journal of Nuclear Materials   Vol. 266-269   page: 1001-1004   1999

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  454. Simulation on Structure and Dynamic Behavior of Dust Particles in a Direct Current Plasma Sheath Reviewed

    K.Asano, N.Ohno, S.Takamura

    Journal of Plasma and Fusion Research   Vol. 75 ( 10 ) page: CD-ROM   1999

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  455. Instability of Dust Particles in a Coulomb Crystal due to Delayed Charging Reviewed

    S.Nunomura, T.Misawa, N.Ohno, S.Takamura

    Physical Review Letters   Vol. 83 ( 10 ) page: 1970-1973   1999

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  456. Dynamic response of detached recombining plasmas to plasma heat pulse in a divertor simulator Reviewed

    N.Ohno, M.Tanaka, N.Ezumi, D.Nishijima, S.Takamura, S.I.Krasheninnikov, A.Yu.Pigarov, J.Park

    Physics of Plasmas   Vol. 6 ( 6 ) page: 2486-2494   1999

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  457. Two-dimensional structure of the detached recombining plasmas associated with molecular acivated recombination Reviewed

    D.Nishijima, N.Ezumi, H.Kojima, N.Ohno, S.Takamura, S.I.Krasheninnikov, A.Yu.Pigarov

    Journal of Nuclear Materials   Vol. 266-269   page: 1161-1166   1999

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  458. Contribution of molecular activated recombination to hydrogen plasma detachment in the divertor plasma simulator, NAGDIS-(]G0002[) Reviewed

    N.Ezumi, D.Nishijima, H.Kojima, N.Ohno, S.Takamura, S.I.Krasheninnikov, A.Yu,Pigarov

    Journal of Nuclear Materials   Vol. 266-269   page: 337-342   1999

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  459. 小特集「多様なPSI現象」4.核融合装置におけるプラズマ・表面相互作用 4.1周辺プラズマ物理と原子・分子過程

    大野哲靖

    プラズマ・核融合学会誌   Vol. 75 ( 4 ) page: 378-383   1999

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  460. 小特集「プラズマ原子・分子過程の展望」5.最近の実験的なトピックス5.1ダイバータプラズマ中の分子活性化再結合過程

    大野哲靖

    プラズマ・核融合学会誌   Vol. 75 ( 10 ) page: 1162-1168   1999

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  461. Modification of Tungsten Surface Irradiated by Low Energy and High Flux Helium Plasma

    M.Y.Ye, S.Fukuta, N.Ohno, S.Takamura, K.Tokunaga, N.Yoshida

    Proc. of 2nd IAEA TCM on Steady-State Operation of Magnetic Fusion Devices, Vol.II FURKU Report 99-05   Vol. II   page: 611-617   1999

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  462. Application of Strongly Ionized AC Tokamak Plasma for Synthesis of TiN Thin Films

    M.Y.Ye, O.Matsuda, N.Ohno, Y.Uesugi, M.Takagi, S.Takamura

    The 2nd Int. Symposium on Applied Plasma Science, Osaka, Japan, 1999, Proc. of ISAPS99, Advances in Applied Plasma Science   Vol. 2   page: 23-28   1999

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  463. Instabilities of Dust Particles Levitated in an Ion Sheath with Low Gas Pressure

    T.Misawa, S.Nunomura, K.Asano, N.Ohno, S.Takamura

    Proc. 2nd Int. Conf. on the Physics of Dusty Plasmas, ICPDP-99, in "Frontiers in Dusty Plasmas", Hakone   Vol. Elsevier   page: 465-468   1999

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  464. Structural Formation and Stability of Coulomb Clouds in Medium through Low Gas Pressure Range

    S.Takamura, N.Ohno, S.Nunomura, T.Misawa, K.Asano

    Proc. 2nd Int. Conf. on the Physics of Dusty Plasmas, ICPDP-99, in "Frontiers in Dusty Plasmas",Hakone,   Vol. Elsevier   page: 337-344   1999

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  465. Ion Temperature Measurement and Energy Balance in Detached Plasmas in the Divertor Simulator, NAGDIS-II

    D.Nishijima, D.G.Whyte, Y.Uesugi, N.Ohno, N.Ezumi, Y.Hirohashi, H.Arakawa, S.Takamura, I. Katsumata

    Proc. 26th EPS Conf. on Controlled Fusion and Plasma Physics, Maastricht, Europhysics Conference Abstracts   Vol. 23J   page: 485-488   1999

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  466. Dynamic Response of Detached Recombining Plasmas to Plasma Heat Pulse Produced by RF Heating Reviewed

      ( 16 )   1999

  467. Effects of Radiation Transport in Detached Recombining Plasmas Reviewed

      ( 16 )   1999

  468. Dependence of Radial Electric Field on Neutral pressure Related to Ion Heating in NAGDIS-II Device Reviewed

    WHYTE D G

      ( 16 )   1999

  469. Structures of Detached Plasmas with High Heat Flow in a Strong Magnetic Field Reviewed

    ニシジマ ダイスケ, エズミ ナオミチ, アオキ コウジ, オオノ ノリヤス*, タカムラ シュウイチ**

    東北大学研究所報告. (工学), 流体科学研究所   Vol. 10   page: 157 - 166   1998.3

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  470. *Experimental Evidence of Molecular Activated Recombination in Detached Recombining Plasmas Reviewed

    N.Ohno, N.Ezumi, S.Takamura, S.I.Krasheninnikov, A.Yu.Pigarov

    Physical Review Letters   Vol. 81 ( 4 ) page: 818-821   1998

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  471. Static and Dynamic Erosion Behavior of TiC Coated Graphite in High Heat Flux Plasma Reviewed

    S.Takamura, K.Hayashi, N.Ohno, K.Morita

    Journal of Nuclear Materials   Vol. 258-263   page: 961-966   1998

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  472. Confinement and Structure of Electrostatically Coupled Dust Clouds in a Direct Current Plasma-Sheath Reviewed

    S.Nunomura, N.Ohno, S.Takamura

    Physics of Plasmas   Vol. 5   page: 3517-3523   1998

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  473. Heat Flow through Plasma Sheaths Reviewed

    S.Takamura, M.Y.Ye, T.Kuwabara, N.Ohno

    Physics of Plasma   Vol. 6 ( 6 ) page: 2151-2158   1998

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  474. Anomaly of Langmuir Probe Characteristics in Detached Recombining Plasma Reviewed

    N.Ezumi, N.Ohno, K.Aoki, D.Nishijima, S.Takamura

    Contributions to Plasma Physics   Vol. 38 ( S ) page: 31-37   1998

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  475. Particle simulation on multiple dust layers of coulomb cloud in cathode sheath edge Reviewed

    K.Asano, S.Nunomura, T.Misawa, N.Ohno, S.Takamura

    Czechoslovak Journal of Physics   Vol. 48   page: 239-244   1998

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  476. Simulation and experiment on detached plasmas in the linear divertor simulator NAGDIS-(]G0002[) Reviewed

    N.Ohno, N.Ezumi, D.Nishijima, S.Takamura

    Czechoslovak Journal of Physics   Vol. 48   page: 127-136   1998

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  477. Enhancement of plasma heat flow to the conductive divertor plate associated with cross-field potential variation and thermoelectron emission Reviewed

    T.Kuwabara, K.Kudose, M.Y.Ye, N.Ohno, S.Takamura

    Contributions to Plasma Physics   Vol. 38 ( 1-2 ) page: 349-354   1998

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  478. Numerical Simulation on Structure of Detached Helium Plasmas with Hydrogen and Helium Gas Puff in NAGDIS-II Reviewed

    D.Nishijima, N.Ezumi, K.Aoki, N.Ohno, S.Takamura

    Contributions to Plasma Physics   Vol. 38 ( 1/2 ) page: 55-60   1998

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  479. Erosion Characteristics of High-Temperature Metal-Carbon Composite Materials under High-Flux Plasma Irradiation

    N.Ohno, S.Takamura

    Proc. of Japan/US Workshop(98FT5-01) on High Heat Flux Components and Plasma Surface Interactions for Next Fusion Devices, Toki, Japan, 1998     page: 474-483   1998

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  480. Observation of Trapping and Fluctuation of a Dust Could at a Very Low Gas Pressure

    S.Nunomura, T.Misawa, K.Asano, N.Ohno, S.Takamura

    Proc. of 1998 International Congress on Plasma Physics combined with 25th EPS Conference on Controlled Fusion and Plasma Physics, Praga, Czech     page: 114-117   1998

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  481. Change in Detached Helium Plasma's Structure Associated with Molecular Activated Recombination

    D.Nishijima, N.Ezumi, H.Kojima, N.Ohno, S.Takamura

    Proc. of 1998 International Congress on Plasma Physics combined with 25th EPS Conference on Controlled Fusion and Plasma Physics, Praga, Czech     page: 23-26   1998

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  482. Space-Charge Limited Emission Current from Material Surface in a Plasma

    Y.M.Ye, T.Shimada, T.Kuwabara, N.Onno, S.Takamura

    Proc. of 1998 International Congress on Plasma Physics combined with 25th EPS Conference on Controlled Fusion and Plasma Physics, Praga, Czech     page: 7-10   1998

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  483. Deposition of TiN Thin Films with Strongly Ionized Plasmas in high Duty AC Tokamak Discharge

    M.Y.Ye, O.Matsuda, N.Ohno, M.Takagi, Y.Uesugi, S.Takamura

    Proc. of 1998 International Congress on Plasma Physics combined with 25th EPS Conference on Controlled Fusion and Plasma Physics, Praga, Czech     page: 2509-2512   1998

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  484. Observation of Funnel-Shaped Dust Cloud Composed of Multiple Layers Reviewed

    MISAWA T., NUNOMURA S., ASANO K., OHNO N., TAKAMURA S.

    Meeting Abstracts of the Physical Society of Japan   Vol. 53 ( 0 )   1998

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    DOI: 10.11316/jpsgaiyo.53.1.4.0_811_1

  485. Erosion and Redeposition Processes of Molybdenum with Oblique Incidence of Magnetic Field Reviewed

    小島 昌博, 井戸 康広, 江角 直道, OHNO Noriyasu, TAKAMURA Shuichi

    プラズマ・核融合学会誌 = Journal of plasma and fusion research   Vol. 73 ( 4 ) page: 452 - 459   1997.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:プラズマ・核融合学会  

    Erosion and redeposition processes have been investigated using a linear plasma device and a Monte Carlo simulation code. Argon plasmas were irradiated on a molybdenum substrate with an oblique incidence of magnetic field. The erosion distributions depending on the direction of magnetic field are clearly observed. Numerical code analysis gives a qualitative explanation for the erosion profiles by considering the effect of prompt redeposition of high Z material. However, we have still quantitative differences for their erosion and redeposition rates.

  486. Effects of ion flow by ExB drift on dust particle behavior in magnetized cylindrical electron cyclotron resonance plasmas Reviewed International journal

    Nunomura S, Ohno N, Takamura S

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   Vol. 36 ( 2 ) page: 877 - 883   1997.2

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  487. Study of hot tungsten emissive plate in high heat flux plasma on NAGDIS-I Reviewed

    M.Y.Ye, N.Ohno, S.Takamura

    Journal of Nuclear Materials   Vol. 241-243   page: 349-352   1997

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  488. Effects of Ion Flow by 丑X(]G1388[) Drift on Dust Particle Behaviour in Magnetizat Cylindrical Electron Cyclotron Reviewed

    S.Nunomura, N.Ohno, S.Takamura

    Japan Journal of Applied Physics   Vol. 36   page: 877-883   1997

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  489. Observation of the Structure and its Formation Process of a New Volumetric Coulomb Cloud Composed of Different Multiple Dust Layers Reviewed

    S.Nunomura, N.Ohno, S.Takamura

    Japan Journal of Applied Physics   Vol. 36   page: L949-951   1997

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  490. Density threshold for plasma detachment in gas target Reviewed

    N.Ezumi, S.Mori, N.Ohno, S.Takamura, H.Suzuki, J.Park

    Journal of Nuclear Materials   Vol. 241-243   page: 349-352   1997

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  491. 講座「プラズマにおけるカオス現象の観測と実験解析II」3.シースに関連したカオス3 2.準周期ルート

    大野哲靖

    プラズマ・核融合学会誌   Vol. 73 ( 8 ) page: 827-833   1997

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  492. Studies on Plasma-Gas Interactions in Powerful High Heat Flux Plasma Device NAGDIS-II

    N.Ezumi, N.Ohno, Y.Uesugi, J.Park, S.Watanabe, S.A.Cohen, S.Krasheninnikov, A.Yu. Pigarov, M.Takagi, S.Takamura

    Proc. of 20th EPS Conference on Controlled Fusion and Plasma Physics, Bercgtesgardenm Germany, 1997     page: 1225-1228   1997

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  493. Structure of Detached Plasmas with High Heat Flow in a Strong Magnetic Field

    D.Nishijima, N.Ezumi, K.Aoki, N.Ohno, S.Takamura

    International Symposium on Plasma and Flow Simulation for Materials Processing, Sendai, Japan, 1997, Reports of the Institute of Fluid Science Tohoku University   Vol. 10   page: 157-166   1997

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  494. 講座「プラズマにおけるカオス現象の観測と実験解析I」2.プラズマにおけるカオス 2.2カオスの解析手法

    大野哲靖

    プラズマ・核融合学会誌   Vol. 73 ( 7 ) page: 682-687   1997

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  495. Full AC Tokamak Discharge in A Small Research Device CSTN-AC

    S.Takamura, K.Hayashi, Y.Marushita, K.Tashiro, Y.Uesugi, N.Ohno, K.Sakurai, M.Kobayashi, M.Takagi, O.Mitarai

    Proc. of 20th EPS Conference on Controlled Fusion and Plasma Physics, Bercgtesgardenm Germany, 1997     page: 1225-1228   1997

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  496. Static and Dynamic Erosion Behavior of TiC Coated Graphite in High Heat Flux Plasma

    S.Takamura, K.Hayashi, N.Ohno, K.Morita

    8th International Conference on Fusion Reactor Materials, Sendai, Japan, 1997   Vol. 1   1997

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  497. Structure and Dynamic Behavior of a Coulomb Cloud Composed of Different Multiple Dust Layers

    S.Nunomura, T.Misawa, K.Asano, N.Ohno, S.Takamura

    39th Annual Meeting fo the Division of Plasma Physics of the American Physical Society, Pittsburgh, USA, 1997   Vol. 1   1997

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  498. Heat Flows through Plasma Sheaths

    S.Takamura, M.Y.Ye, T.Kuwabara, N.Ohno

    39th Annual Meeting of the Division of Plasma Physics of the American Physical Society, Pittsburgh, USA, 1997   Vol. 1   1997

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  499. Plasma Heat FLow through Plasma Sheath with Electron Emission and Plasma Poe\tental Variation across Magnetic Field

    M.Y.Ye, K.Kudose, T.Kuwabara, N.Ohno, S.Takamura

    7th Asia Pacific Physics Conference, Beijing, China, 1997   Vol. 1   1997

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  500. Numerical Analysis on Fine Particle's Behavior in an Ion-Beam Plasma System

    N.Ohno, M.Nakamura, S.Nunomura, S.Takamura

    Proc. of 23th Inernational Conference on Phenomena in Ionized Gases, Toulouse, France 1997     page: 196-197   1997

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  501. Generation of high heat flux plasma in divertor plasma simulator by ion cyclotron wave heating Reviewed International journal

    Watanabe S, Ohsawa S, Takagi M, Ohno N, Uesugi Y, Takamura S

    ICPP 96 CONTRIBUTED PAPERS - PROCEEDINGS OF THE 1996 INTERNATIONAL CONFERENCE ON PLASMA PHYSICS, VOLS 1 AND 2     page: 1050 - 1053   1997

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  502. Generation of high heat flux plasmas by rf heating in divertor plasma simulator NAGDIS-II Reviewed International journal

    Watanabe S, Ohsawa S, Takagi M, Ohno N, Uesugi Y, Takamura S

    RADIO FREQUENCY POWER IN PLASMAS   ( 403 ) page: 483 - 486   1997

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  503. Suppression of secondary electron emission from the material surfaces with grazing incident magnetic field in the plasma Reviewed International journal

    Takamura S, Mizoshita S, Ohno N

    PHYSICS OF PLASMAS   Vol. 3 ( 12 ) page: 4310 - 4312   1996.12

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  504. Nonlinear interactions between high heat flux plasma and electron-emissive hot material surface Reviewed International journal

    Ye MY, Masuzaki S, Shiraishi K, Takamura S, Ohno N

    PHYSICS OF PLASMAS   Vol. 3 ( 1 ) page: 281 - 292   1996.1

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  505. Particle in Cell Simulation on Thermoelectron Emission from Hot Target Plate Reviewed

    N.Ohno, E.Shimizu, S.Takamura

    Contributions to Plasma Physics   Vol. 36 ( 2-3 ) page: 386-390   1996

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  506. Numerical Simulation Study on Density Dependence of Plasma Detachment in Simulated Gas Divertor Experiments of The TPD-I Device Reviewed

    N.Ohno, S.Mori, N.Ezumi, M.Takagi, S.Takamura, H.Suzuki

    Contributions to Plasma Physics   Vol. 36 ( 2-3 ) page: 339-343   1996

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  507. Characterization of gaseous carbon plasma in a low-temperature tokamak discharge Reviewed

    O.Matsuda, N.Ohno, S.Takamura

    Plasma Source Science and Technology   Vol. 5   page: 356-362   1996

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  508. Suppression of Secondary Electron Emission From the Material Surfaces with Grazing Incident Magnetic Field in th Plasma Reviewed

    S.Takamura, S.Mizoshita, N.Ohno

    Physics of Plasma   Vol. 3 ( 12 ) page: 4310-4312   1996

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  509. Static and Dynamic Characteristics of Plasma Detachment in Gas Target Scheme

    N.Ezumi, M.Tanaka, S.Mori, N.Ohno, M.Takagi, S.Takamura, H.Suzuki

    Proc. of the 1996 International Conference on Plasma Physics, Nagoya, Japan     page: 614-617   1996

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  510. Control of Dust Particles' Behavior by Using Ion Flow

    S.Nunomura, M.Nakamura, N.Ohno, S.Takamura

    International Conference on the Physics of Dusty Plasmas, Goa, India, 1996, "Advances in Dusty Plasmas" ed. by PO.K.Shukla, D.A Mendis and T.Desai, World Scientific Publishing Co., Singapore   Vol. 1   1996

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  511. Generation of Dustyt Plasma in a Double-Plasma Device

    M.Nakamura, S.Nunomura, H.K.Malik, N.Ohno, S.Takamura

    Proc. of the 1996 International Conference on Plasma Physics, Naoya Japan     page: 1982-1985   1996

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  512. Characterization of Gaseous Carbon Plasma in a Low-Temperature Tokamak Discharge as Processing Plasma

    O.Matsuda, N.Ohno, S.Takamura

    Proc. of the 1996 International Conference on Plasma Physics, Naoya Japan     page: 1814-1817   1996

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  513. Impurtity Generation, Transport and Redeposition at Plasma Boundary

    M.Kojima, Y.Ido, N.Ezumi, N.Ohno, S.Takamura

    Proc. of the 1996 International Conference on Plasma Physics, Naoya Japan     page: 1402-1405   1996

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  514. Physical Mechanism of Plasma Heat Flow into Electron-Emissive Hot Material Surface

    M.Y.Ye, T.Kuwabara, N.Ohno, S.Takamura

    Proc. of the 1996 International Conference on Plasma Physics, Naoya Japan     page: 1398-1401   1996

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  515. Plasma Heat Contraction on Conducting Plate due to Plasma Potential Variation across the Magnetic Field

    T.Kuwabara, K.Kudose, M.Y.Ye, N.Ohno, S.Takamura

    Proc. of the 1996 International Conference on Plasma Physics, Naoya Japan     page: 1386-1389   1996

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  516. High Heat Flux Plasma Generator for New Divertor Plasma Simulator in Nagoya University

    S.Narita, N.Ezumi, N.Ohno, Y.Uesugi, S.Takamura

    Proc. of the 1996 International Conference on Plasma Physics, Naoya Japan     page: 1362-1365   1996

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  517. Comprehensive Studies on Secondary Electron Emission from Material Surface in Magnetized Plasma

    S.Takamura, S.Mizoshita, K.Shiraishi, N.Ohno

    Proc. of the 1996 International Conference on Plasma Physics, Nagoya, Japan     page: 610-613   1996

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  518. Temperature Dependence of Ti Sputtering Yield from TiC Composite Material under High Heat Flux Plasma Irradiation

    K.Hayashi, N.Ohno, S.Takamura, K.Morita

    Proc. of the 1996 International Conference on Plasma Physics, Nagoya, Japan     page: 1410-1413   1996

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  519. Full AC Plasma Current Operation in the CSTN-AC Tokamak

    K.Hayashi, Y.Marushita, K.Tashiro, N.Ohno, S.Takamura, O.Mitarai, K.Sakurai, S.Satoh T.Kuwabara

    Proc. of the 1996 International Conference on Plasma Physics, Nagoya, Japan     page: 1246-1249   1996

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  520. 1P-YM-5 Effect of Plasma Flow on Transport of Fine Particles Reviewed

    Nunomura S., Nakamura M., Ohno N., Takamura S.

    Meeting Abstracts of the Physical Society of Japan   Vol. 51 ( 0 )   1996

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    DOI: 10.11316/jpsgaiyog.51.4.0_189_2

  521. 電界制御による微粒子プラズマの生成 Reviewed

    布村 正太, 古橋 一能, 大野 哲靖, 高村 秀一

    電気学会研究会資料. EP, プラズマ研究会   Vol. 1995 ( 31 ) page: 51 - 58   1995.5

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  522. Reduction of Plasma heat flow to a simulated divertor target plate by ponderomotive force Reviewed

    S.Masuzaki, N.Ohno, S.Takamura

    Journal of Nuclear Materials   Vol. 220-222   page: 1112-1115   1995

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  523. Gas target experiments high heat flux plasma of the TPD-I device Reviewed

    N.Ohno, S.Masuzaki, M.Takagi, S.Takamura, K.Ishii

    Journal of nuclear materials   Vol. 220-222   page: 279-283   1995

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  524. Heat Transport and Associated Surface Phenomena at the Plasma-Material Interface in Heat and Mass Transfer under Plasma Condition

    S.Takamura, N.Ohno

    Begell House, Inc.,     page: 245-252   1995

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  525. Experimental Study on Plasma Heat Flow to Plasma Facing Materials Reviewed

    S.Masuzaki, N.Ohno, S.Takamura

    Journal of Nuclear Materials   Vol. 223   page: 173-178   1995

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  526. Monte Carlo Simulation on Active Helium-Ash Exhaust by Divertor Biasing Reviewed

    T.Kuwabara, M.Kojima, N.Ohno, Y.Uesugi, S.Takamura, Y.Yamamura

    Journal of Nuclear Materials   Vol. 220-222   page: 1001-1004   1995

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  527. Secondary electron emission from solid surface in an oblique magnetic field Reviewed

    S.Mizoshita, K.Shiraishi, N.Ohno, S.Takamura

    Journal of Nuclear Materials   Vol. 220-222   page: 488-492   1995

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  528. Heat Transport and Associated Surface Phenomena at the Plasma-Material Interface Reviewed

    S.Takamura, N.Ohno

    "Heat and Mass Transfer under Plasma Condition" ed by P. Fan chais, M. Boubs and J. Vander Mullen, Begell House     page: 245-251   1995

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  529. Sensitive Detection of Probing Electron Transport and Magnetic Field Structure in Toroidal Plasma Configuration Reviewed

    S.Sakurai, N.Ohno, S.Takamura

    Japanese Journal of Applied Physics   Vol. 33 ( 2 ) page: 1161-1168   1994

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  530. Detection of Electron Beam Orbits in a Tokamak Configuration with External Helical Magnetic Field Reviewed

    S.Sakurai, N.Ohno, S.Takamura

    Journal of Plasma and Fusion Research   Vol. 70 ( 2 ) page: 173-178   1994

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  531. Gas Target Experiments in High Heat Flux Plasma of the TPD-I Device

    N.Ohno, S.Masuzaki, S.Mori, N.Ezumi, M.Takagi, S.Takamura

    36th Annual Meeting APS Division of Plasma Physics, Minneapolis, USA   Vol. 1994   1994

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  532. Dynamic CT System for Visible Light Emission from Tokamak Plasma with Charge Coupled Detectors Reviewed

    Oda Yoshihiro, Takamura Shuichi, Uesugi Yoshihiko, Ohno Noriyasu

    Journal of plasma and fusion research   Vol. 69 ( 3 ) page: p250 - 257   1993.3

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    A tomographic reconstruction system with five channels for visible light emission has been developed and applied to observe the visible light emission from HYBTOK-II tokamak plasma. A compact and low cost computed tomography (CT) system with a good spatial and time resolution was established using an array of charge coupled devices. The shuttering capability of the CT system is 300 μs. A rapid change of the emission profile due to the deviation from the tokamak equilibrium was successfully followed. Present CT system with five CCD cameras enables us to recognize a local increment of the visible light emission due to the plasma arcing, which is difficult to observe with the conventional three camera CT system, which is often employed for fusion plasma diagnostics.

  533. Gaseous Silicon Plasma Generated by a Low-Temperature Tokamak Discharge Reviewed

    Hiramatsu Kenji, Takamura Shuichi, Ohno Noriyasu

    Journal of plasma and fusion research   Vol. 69 ( 2 ) page: p121 - 128   1993.2

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  534. Dynamical CT System for visible Light Emission From Tokamak Plasma with Charge Coupled Defectors Reviewed

    Y.Oda, Y.Uesugi, S.Takamura, N.Ohno

    Journal of Plasma and Fusion Research   Vol. 69 ( 3 ) page: 250-257   1993

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  535. Sheath Voltage on Carbon Surface in a Hydrogen Plasma with Hot Electrons Reviewed

    K.Shiraishi, N.Ohno, S.Takamura

    Journal of Plasma and Fusion Research   Vol. 69 ( 11 ) page: 1371-1377   1993

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  536. Chaotic Behavior Driven by an External Periodic Oscillation in a Current-Carrying Unstable Ion Sheath Reviewed

    N.Ohno, A.Komori, M.Kono, Y.Kawai

    Physics of Fluids B   Vol. 5 ( 3 ) page: 796-805   1993

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  537. Experimental and Theoretical Study on Plasma Heat Flow to Plasma Facing Materials

    S.Masuzaki, H.Konnno, N.Ohno, S.Takamura

    Proc. of 20th EPS Conference on Controlled Fusion and Plasma Physics, Lisboa   Vol. 743-746   1993

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  538. BIFURCATION PHENOMENA IN AN EMISSIVE PLATE - SIMULATED DIVERTOR PLASMA SYSTEM Reviewed

    TAKAMURA S, OHNO N, SHIRAISHI K, MASUZAKI S

    JOURNAL OF NUCLEAR MATERIALS   Vol. 196   page: 448 - 451   1992.12

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  539. SHEATH FORMATION ON CARBON AND REFRACTORY-METALS IN A PLASMA WITH ENERGETIC ELECTRONS Reviewed International journal

    SHIRAISHI K, OHNO N, UESUGI Y, TAKAMURA S

    JOURNAL OF NUCLEAR MATERIALS   Vol. 196   page: 745 - 749   1992.12

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  540. INTERMITTENCY DURING TRANSITION BETWEEN STATIONARY AND PERIODIC STATES IN PLASMAS Reviewed International journal

    KOMORI A, OHNO N, YAMAURA T, KAWAI Y

    PHYSICS LETTERS A   Vol. 170 ( 6 ) page: 439 - 442   1992.11

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  541. Sheath Formation on Carbon and and Refractory Metals in a Plasma with Energetic Electrons Reviewed

    K.Shiraishi, N.Ohno, Y.Uesugi, S.Takamura

    Journal of Nuclear Materials   Vol. 196-198   page: 745-749   1992

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  542. Gaseous Silicon Plasma Generated by a Low-Temperatue Tokamak Discharge Reviewed

    K.Hiramatsu, N.Ohno, S.Takamura

    Jouranl of Plasma and Fusion Research   Vol. 69 ( 2 ) page: 121-128   1992

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  543. Studies on Sheath Formation in Divertor Plasmas by Computer Simulation Using Particle Reviewed

    N.Ohno, S.Masuzaki, H.Konno, S.Takamura

    Contributions to Plasma Physics   Vol. 3 ( 3-4 ) page: 249-354   1992

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  544. 高熱流プラズマの生成とその高速掃引プローブ計測システムによる計測 Reviewed

    増崎貴、大野哲靖、高木誠、高村秀一

    電気学会論文誌A   Vol. 112 ( 11 ) page: 913-921   1992

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  545. Intermittency During Transition Between Stationary and Periodic States of Plasmas Reviewed

    A.Komori, N.Ohno, T.Yamaura, Y.Kawai

    Physics Letter A   Vol. 170 ( 6 ) page: 439-442   1992

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  546. Bifurcation Phencomena in an Emissive Plate-Simulated Divertor Plasma System Reviewed

    S.Takamura, N.Ohno, K.Shiraishi, S.Masuzaki

    Journal of Nuclear Materials   Vol. 196-198   page: 448-451   1992

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  547. Numerical Study of Potential Formation and Negative Resistance in a Currnet Carrying Ion Sheath

    N.Ohno, A.Komori, Y.Kawai, S.Takamura

    Proc. of 1992 International Conference on Plasma Physics, Innsbruck, Austria     page: 1807-1810   1992

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  548. 26p-C-7 A quasiperiodic route to chaos observed in an ion sheath Reviewed

    Komori A, Ohno N, Kono M, Tanaka M, Kawai Y

    Meeting Abstracts of the Physical Society of Japan   Vol. 1992 ( 0 )   1992

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    DOI: 10.11316/jpsgaiyok.1992.4.0_175_2

  549. STUDIES ON SHEATH FORMATION IN DIVERTOR PLASMAS BY COMPUTER-SIMULATION USING PARTICLES Reviewed International journal

    OHNO N, MASUZAKI S, KONNO H, TAKAMURA S

    CONTRIBUTIONS TO PLASMA PHYSICS   Vol. 32 ( 3-4 ) page: 249 - 254   1992

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  550. INSTABILITIES ASSOCIATED WITH A NEGATIVE RF RESISTANCE IN CURRENT-CARRYING ION SHEATHS Reviewed International journal

    OHNO N, KOMORI A, TANAKA M, KAWAI Y

    PHYSICS OF FLUIDS B-PLASMA PHYSICS   Vol. 3 ( 1 ) page: 228 - 235   1991.1

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  551. 短ギャップ同軸型マイクロ波放電の放電開始条件に及ぼす磁界の影響 Reviewed

    重水哲郎、大野哲靖、藤山寛

    電気学会論文誌A   Vol. 111 ( 8 ) page: 727-732   1991

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  552. Instabilities associated with a negative of resistance in current-Carrying ion sheaths Reviewed

    N.Ohno, A.Komori, M.Tanaka, Y.Kawai

    Physics of Fluids   Vol. B3 ( 1 ) page: 228-235   1991

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  553. Characteristics of ECR Plasmas for Weakly resonant conditions Reviewed

    M.Saigoh, N.Ohno, H.Fujiyama

    Material Science and Engineering   Vol. A139   page: 307-311   1991

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  554. ボックスカー撮像法によるプラズマ中磁力線構造可視化システム

    櫻井真治、大野哲靖、高村秀一

    第6回産業における画像センシング技術シンポジウム講演論文集     page: 177-182   1991

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  555. Averaging Effect of Radical Profile by the Scanning Plasma Method in S : H4-Ar Plasma Reviewed

    H.Kawasaki, N.Ohno, Y.Matsuda, H.Fujiyama

    Material Science and Engineering   Vol. A140   page: 569-575   1991

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  556. Development of Coaxial ECR Plasma Source for tube inner coating Reviewed

    T.Shigemizu, N.Ohno, H.Fujiyama

    Material Science and Engineering   Vol. A139   page: 312-318   1991

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  557. Effect of Magnetic Field on Gaseous Breakdown Conditions of Narrow-Gap Coaxial-type Microwave Discharge Reviewed

    Shigemizu Tetsuro, Ohno Noriyasu, Fujiyama Hiroshi

    IEEJ Transactions on Fundamentals and Materials   Vol. 111 ( 8 ) page: 727 - 732   1991

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    The gaseous breakdown conditions by the microwave field were theoretically and experimentally investigated in the presence of an external crossed magnetic field. We developed the calculating method by taking account of collisions between electrons and neutral gases, and electron losses to a boundary in the magnetic field to be able to calculate the breakdown voltages in a low gas pressure range from 1&times;10<sup>-4</sup> to 1&times;10<sup>-2</sup>Torr. These calculated results are in good agreement with experimental ones. In the narrow-gap less than the wavelength of the microwave, both the magnetic field and the electron loss to the boundary play an important role for the breakdown condition. Coaxial-type electron cyclotron resonance (ECR) plasmas can be generated in a metal coaxial tube with a gap length of 4.5mm gap.

    DOI: 10.1541/ieejfms1990.111.8_727

  558. Chaotic Behavior of Current -Carrying Plasmas in External Periodic Oscillations Reviewed

    N.Ohno, A.Komori, M.Tanaka, Y.Kawai

    Journal of Physical Society of Japan   Vol. 58 ( 1 ) page: 28-31   1989

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  559. Instatbilities Associated with Chaotic Behavior in a Current-Carrying Plasma

    A.Komori, N.Ohno, M.Tanaka, Y.Kawai

    Proc. of 1989 International Conference on Plasma Physics, New Delhi, India     page: 801-804   1989

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  560. Chaotic Behavior due to Wave-Wave Interaction in a Modulated Ion Beam-Plasma System

    K.Araki, M.Saigoh, N.Ohno, H.Fujiyama, M.Nambu, H.Honjo

    Proc. of 1989 International Conference on Plasma Physics, New Delhi, India     page: 789-793   1989

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  561. イオンビームプラズマ系におけるサブハーモニックスの励起機構の研究

    大野哲靖、粕谷俊郎、田中雅慶、小森彰夫、河合良信

    九州大学総合理工学研究科報告   Vol. 9 ( 1 )   1987

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  562. Observation of Subharmonic Waves in an Ion Beam-Plasma System

    N.Ohno, T.Kasuya, A.Komori, Y.Kawai

    Proc. of International Conference on Phenomena in Ionized Gases, Swansea, England, 1987     page: 270-271   1987

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Books 2

  1. 電磁気学ビギナーズ講義

    大野 哲靖, 松村 年郎, 内山 剛, 横水 康伸, 天野 浩

    培風館  2018  ( ISBN:9784563025212

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  2. 水素・ヘリウム混合プラズマの照射によるタングステン材料表面特性変化の評価

    大野 哲靖( Role: Joint author)

    [出版者不明]  2003 

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    Language:Japanese Book type:Scholarly book

    CiNii Books

MISC 81

  1. 3.非接触プラズマと熱・粒子処理に関するダイバータ実験研究 およびモデリングの現状と研究開発課題 Reviewed

    大野 哲靖

    J. Plasma Fusion Res.   Vol. 92   page: 877 - 881   2016

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    CiNii Research

  2. Nanostructure Formation on Refractory Metal Surfaces Irradiated by Helium Plasmas

    Takamura Shuichi, Kajita Shin, Ohno Noriyasu

    Butsuri   Vol. 68 ( 9 ) page: 602 - 611   2013.9

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    Helium defects on plasma-facing refractory metals like tungsten have been studied in fusion sciences from the view point of the effects on metal surface properties, concentrating on the bubble formation. However, the surface morphology over the lower surface temperature range was found recently to be changed drastically, something like cotton down or arborescence, sometimes called as "fuzz". The formation process, although still open problem, would be discussed in terms of viscoelastic model with the effect of surface tension, taking account of its thermal properties and nano-bubbles inside the thin fibers. Some physical surface characteristics like electron emission, radiation emissivity and sputtering are quite influenced by its forest-like structure. Unipolar arcing has been newly studied by using such a surface structure which makes its initiation controllable. In the present report, other examples of nanostructure formation in a variety of particle incident conditions have been introduced as well as the possibility of its industrial applications to enhance interdisciplinary interests.

    DOI: 10.11316/butsuri.68.9_602

    CiNii Research

  3. Merging Plasma Science into Combustion Science ― Plasma-Assisted Combustion ―

    SASAKI Koichi, UESUGI Yoshihiko, OHNO Noriyasu, OSAKA Yugo

    Journal of the Combustion Society of Japan   Vol. 51 ( 158 ) page: 259 - 267   2009

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    <p>Recently, plasma-assisted combustion attracts much attention of many researchers as a new interdisciplinary field between combustion and plasma sciences. In this article, we describe a brief explanation of various plasmas, concepts of plasma-assisted combustion, and the research trend of plasma-assisted combustion. We also report examples of experimental investigation on plasma-assisted combustion, which have been carried out in authors' research groups.</p>

    DOI: 10.20619/jcombsj.51.158_259

    CiNii Research

  4. 核融合プラズマと プラズマプロセッシングの橋渡

    大野 哲靖, 高村 秀一

    プラズマ・核融合学会誌   Vol. Vol.84   page: 740 - 749   2008

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  5. JT-60U周辺プラズマ中の間欠的揺動と非拡散的プラズマ輸送

    大野 哲靖, 朝倉 伸幸, 高村 秀一

    第22回プラズマ・核融合学会年会 シンポジウムIII「核融合プラズマにおける周辺プラズマ揺動の物理と観測」     2004

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    CiNii Research

  6. Erratum:"Blob- and hole-like structures outstanding during the transition from attached to detached divertor states in GAMMA 10/PDX Physics of Plasmas" Reviewed

    H.Tanaka, M.Sakamoto, N.Ezumi, K.Nojiri, A.Terakado, T.Mikami, Y.Kinoshita, K.Kobayashi, M.Yoshikawa, J.Kohagura, N.Ohno

    Physics of Plasmas   Vol. 28 ( 2 ) page: 29901   2021

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    DOI: 10.1063/5.0045722

  7. プラズマ科学がもたらす新しい世界-核融合理工学技術のスピンオフー

    柳長門、竹入康彦、大野哲靖、梶田信

    電気評論   Vol. 104 ( 5 ) page: 67 - 71   2019.5

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  8. 核融合分野における人材育成ー大学における核融合理工学教育ー

    大野哲靖

    電気評論   Vol. 104 ( 5 ) page: 72 - 76   2019.5

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  9. Effect of Damage Introduction and He Existence on D Retention in Tungsten by High Flux D Plasma Exposure

    Yasuhisa Oya, Keisuke Azuma, Akihiro Togari, Moeko Nakata, Qilai Zhou, Mingzhong Zhao, Tatsuya Kuwabara, Noriyasu Ohno, Miyuki Yajima, Yuji Hatano, Takeshi Toyama

    Lecture Notes in Networks and Systems   Vol. 53   page: 89 - 96   2019.1

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    © 2019, Springer Nature Switzerland AG. Both of radiation-induced damages and helium (He) existence effects on deuterium (D) retention in tungsten (W) by D plasma exposure were evaluated using high flux divertor plasma exposure device, called Compact Divertor Plasma Simulator (CDPS). The results were compared with 3 keV D 2+ implanted W with low flux and fluence. The thermal desorption spectra were consisted of three desorption stages at 400, 600, 780 K. Comparing to the undamaged W, the D desorption stages were shifted towards higher temperature side and the values of D retention increased. It can be said that the formation of stable trapping sites by damage introduction enhances the D trapping in the damaged W. For He + irradiation, D desorption at lower temperature was enhanced, due to the formation of dense dislocation loops. In case of sequential Fe 2+ and He + implantation, D desorption at higher temperature was reduced, comparing to that for only Fe 2+ damaged W. These facts show that the accumulation of He near surface region reduces D diffusion toward bulk, leading to the reduction of D trapping by voids.

    DOI: 10.1007/978-3-319-99834-3_12

    Scopus

  10. ヘリウムプラズマ照射を用いた酸化チタン薄膜光触媒のエチレン分解反応

    富田雄大, 梶田信, 吉田朋子, 安永円理子, 大野哲靖, 田中宏彦

    触媒討論会討論会A予稿集   Vol. 122nd   page: 104   2018.9

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    J-GLOBAL

  11. 様々な金属へのヘリウムプラズマ照射による表面構造変化

    野嶋智宏, 梶田信, 吉田直亮, 大野哲靖, 田中宏彦, 時谷政行, 永田大介

    日本金属学会講演概要(CD-ROM)   Vol. 163rd   page: ROMBUNNO.P66   2018.9

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    J-GLOBAL

  12. ヘリウムプラズマで誘起する金属表面の繊維状ナノ構造 6.タングステン繊維状ナノ構造を用いたミュオニウム生成

    薮内敦, 大野哲靖, 三宅康博, 池戸豊, 下村浩一郎, 西山樟生, 小嶋健児, 河村成肇, STRASSER Patrick, 藤森寛, 牧村俊助, 中村惇平, 齊藤直人, 三部勉, 大谷将士, 神田聡太郎, 西村昇一郎, 北村遼, 長嶋泰之, 鈴木卓爾, 長友傑

    プラズマ・核融合学会誌   Vol. 94 ( 6 ) page: 315‐319   2018.6

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    J-GLOBAL

  13. フラクタル構造を持つタングステンの光学応答のFDTDシミュレーション

    中村浩章, 中村浩章, 尾碕真志, 浅野恵吾, 梶田信, 大野哲靖, 羽田野直道

    日本物理学会講演概要集(CD-ROM)   Vol. 73 ( 1 ) page: ROMBUNNO.22pK501‐14   2018.3

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    J-GLOBAL

  14. 工学実証段階にきた核融合発電研究の現状と課題

    大野哲靖

    中部電力株式会社技術開発ニュース   ( 158 ) page: 3‐4   2018.2

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    J-GLOBAL

  15. Characterized divertor footprint profile modification with the edge pressure gradient in the Large Helical Device Reviewed

    H. Tanaka, S. Masuzaki, G. Kawamura, M. Kobayashi, Y. Suzuki, G. Motojima, T. Murase, T. Morisaki, N. Ohno, LHD Experiment Group

    Plasma Phys. Control. Fusion   Vol. 60   page: 125001   2018

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  16. Measurement of He neutral temperature in detached plasmas using laser absorption spectroscopy Reviewed

    M. Aramaki, T. Tsujihara, S. Kajita, H. Tanaka, N. Ohno

    AIP Advances   Vol. 8   page: 015308   2018

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  17. 非接触ダイバータプラズマ研究の進展

    大野哲靖

    プラズマ・核融合学会プラズマ若手夏の学校テキスト   Vol. 57th   page: (42)‐(49)   2018

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    J-GLOBAL

  18. High-temporal measurements of plasma-material interactions with a pulsed plasma in NAGDIS-PG

    T. Nakamori, S. Inagaki, N. Ohno, S. Kajita, H. Tanaka, Y. Kikuchi, T. Akiyama

        page: 22P-105   2017.11

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  19. He原子線強度比法を用いた非接触プラズマの電子温度・密度評価

    鈴木健介, 梶田信, 大嶋啓嗣, 大野哲靖, 田中宏彦, 秋山毅志

    電気学会基礎・材料・共通部門大会講演論文集(CD-ROM)   Vol. 2017   page: ROMBUNNO.19‐P‐16   2017.9

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    J-GLOBAL

  20. ヘリウム入射イオンエネルギーのパルス的変化がタングステンナノ構造成長に与える影響

    河口翔太, 梶田信, HWANGBO Dogyun, 大野哲靖, 田中宏彦, 増崎貴

    電気学会基礎・材料・共通部門大会講演論文集(CD-ROM)   Vol. 2017   page: ROMBUNNO.19‐P‐14   2017.9

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    J-GLOBAL

  21. 金属堆積層がタングステン材へのパルスプラズマ熱流流入過程に与える影響の解明

    稲垣翔平, 中森貴也, 大野哲靖, 梶田信, 田中宏彦, 菊池祐介, 秋山毅志

    電気学会基礎・材料・共通部門大会講演論文集(CD-ROM)   Vol. 2017   page: ROMBUNNO.19‐P‐11   2017.9

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    J-GLOBAL

  22. 小型トカマク装置HYBTOK‐IIにおける外部摂動磁場‐プラズマ相互作用とプラズマ流の関係

    吉本直哉, 柴田欣秀, 岡本征晃, 大野哲靖, 梶田信, 田中宏彦, 松永剛, 菊池祐介, 佐久間一行, 榊原悟, 渡邊清政

    電気学会基礎・材料・共通部門大会講演論文集(CD-ROM)   Vol. 2017   page: ROMBUNNO.19‐P‐7   2017.9

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    J-GLOBAL

  23. 不純物ガス雰囲気下におけるタングステン材の重水素吸蔵量のその場計測

    足立博昭, 大野哲靖, 梶田信, 桑原竜弥, 松波紀明, 本島厳

    電気学会基礎・材料・共通部門大会講演論文集(CD-ROM)   Vol. 2017   page: ROMBUNNO.19‐P‐6   2017.9

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    J-GLOBAL

  24. ヘリウムプラズマ照射によるナノニオブ作製とその光触媒活性評価

    三室文明, 梶田信, 大野哲靖, 吉田朋子

    触媒討論会討論会A予稿集   Vol. 120th   page: 100   2017.9

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    J-GLOBAL

  25. 重イオン照射タングステン中の重水素滞留挙動に及ぼす重水素プラズマ照射影響

    東奎介, 植村有希, 桜田翔大, 藤田啓恵, ZHOU Quilai, 吉田直亮, 外山健, 近藤創介, 檜木達也, 桑原竜弥, 大野哲靖, 近田拓未, 大矢恭久

    日本原子力学会春の年会予稿集(CD-ROM)   Vol. 2017   page: ROMBUNNO.2B03   2017.3

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    J-GLOBAL

  26. ポーラスタングステンのヘリウムプラズマ照射によるナノ構造化

    梶田信, 田中宏彦, 大野哲靖

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   Vol. 64th   page: ROMBUNNO.16a‐315‐10   2017.3

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    J-GLOBAL

  27. プラズマ・中性子照射材相互作用研究のための小型高密度プラズマ発生装置の高性能化

    大野哲靖, 桑原竜弥, 高木誠, 矢嶋美幸, 足立博昭, 外山健

    東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書(CD-ROM)   Vol. 34   page: 52‐53   2017

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    J-GLOBAL

  28. 中性子照射タングステン中の照射欠陥生成・消滅とトリチウム滞留挙動の相関

    大矢恭久, 東奎介, 戸苅陽大, 矢嶋美幸, 桑原竜弥, 大野哲靖, 外山健

    東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書(CD-ROM)   Vol. 34   page: 38‐39   2017

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    J-GLOBAL

  29. 中性子とヘリウムの複合照射がプラズマ対向材料中の水素捕捉に及ぼす影響

    信太祐二, 桑原竜弥, 大野哲靖, 矢嶋美幸, LEE H. T, 鈴木克弥, 外山健

    東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書(CD-ROM)   Vol. 34   page: 40‐41   2017

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    J-GLOBAL

  30. ホットラボ用小型ダイバータプラズマ模擬試験装置を用いた照射損傷試料の重水素吸蔵に関する研究

    矢嶋美幸, 大野哲靖, 波多野雄治, 桑原竜弥, 外山健, 増崎貴, 大矢恭久, 時谷政行, 近藤創介

    東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書(CD-ROM)   Vol. 34   page: 54‐55   2017

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    J-GLOBAL

  31. Molecular dynamics for bursting of helium bubble on the tungsten bubble

    A. M. Ito, A. Takayama, S. Saito, N. Ohno, S. Kajita, H. Nakamura

    ANNUAL REPORT OF NIFS April 2013-March 2014     2014.11

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  32. 直線型プラズマ生成装置の現状とDEMOのダイバータ設計における課題 (小特集 DEMOに向けた直線型装置を用いた境界プラズマ,プラズマ・壁相互作用研究)

    坂本 瑞樹, 大野 哲靖, 朝倉 伸幸, 星野 一生

    プラズマ・核融合学会誌   Vol. 90 ( 8 ) page: 473 - 479   2014.8

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  33. プロジェクトレビュー 非平衡極限プラズマネットワーク構想 : プラズマ物理科学の新しい研究体制

    藤澤 彰英, 伊藤 公孝, 伊藤 早苗, 上杉 喜彦, 大野 哲靖, 金子 俊郎, 兒玉 了祐, 白谷 正治, 田中 和夫, 畠山 力三, 浜口 智志, 米田 仁紀

    プラズマ・核融合学会誌   Vol. 90 ( 3 ) page: 177 - 182   2014.3

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  34. イオンビームを用いたプラズマ照射下その場水素濃度計測 (小特集 放射線照射環境下における材料物性値のその場測定) -- (材料の物性値に対する放射線照射誘起効果)

    大野 哲靖, 松波 紀明

    プラズマ・核融合学会誌   Vol. 90 ( 1 ) page: 59 - 63   2014.1

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  35. 第一壁トリチウム・物質移行 (プロジェクトレビュー 日米科学技術協力事業TITANプロジェクト) -- (第一壁・ブランケットの物質熱輸送に関する研究)

    徳永 和俊, 宮本 光貴, 大塚 哲平, 梶田 信, 大野 哲靖, 上田 良夫

    プラズマ・核融合学会誌   Vol. 89 ( 11 ) page: 709 - 713   2013.11

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  36. ヘリウムプラズマ照射により高融点金属表面に形成されたナノ構造

    高村秀一、梶田信、大野哲靖

    日本物理学会誌   Vol. 68 ( 9 ) page: 602 - 611   2013.9

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  37. 核融合研究での微粒子 : 核融合プラズマ実験装置中での微粒子の生成と挙動の観測

    大野 哲靖, 朝倉 伸幸

    プラズマ・核融合学会誌   Vol. 87 ( 3 ) page: 153 - 159   2011.3

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  38. Introduction

    ITO Atsushi M., OHNO Noriyasu

      Vol. 86 ( 12 ) page: 679 - 680   2010.12

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  39. Formation mechanism of surface nano-structure in W by helium plasma bomberdment Reviewed

    Yoshida Naoaki, Yoshihara Reiko, Ohno Noriyasu, Kajita Shin

    Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan   Vol. 2010 ( 0 ) page: 957 - 957   2010

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    DOI: 10.11561/aesj.2010f.0.957.0

  40. Ad/absorption of tritium by nanostructure formed on tungsten Reviewed

    HATANO Yuji, SHI Jie, YAJIMA Miyuki, SAEKI Tsubasa, KAJITA Shin, OHNO Noriyasu

    Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan   Vol. 2010 ( 0 ) page: 917 - 917   2010

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    DOI: 10.11561/aesj.2010f.0.917.0

  41. 核融合プラズマ対向材料としての高融点金属材料の現状と課題

    大野哲靖

    ケミカルエンジニヤリング   Vol. 55 ( 12 ) page: 46 - 51   2010

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  42. Investigation on the Effect of Temperature Excursion on the Helium Defects of Tungsten Surface by using Compact Plasma Device

    S.Takamura, T.Miyamoto, Y.Tomita, T.Minagawa and N.Ohno

      Vol. 12   page: 25 - 29   2010

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  43. 8.4 SOL Flow and Plasma Profiles in High-Field-Side SOL

    N.Asakura, T.Nakano, N.Ohno, H.Tanaka

    Review of JT-60U Experimental Results in 2007 and 2008   Vol. JAEA-Review 2009-045   page: 117 - 120   2010

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  44. 8.3 Fluctuation Characteristics in the Detached Divertor

    N.Asakura, N.Ohno, H.Tanaka, H.Kawashima, T.Nakano

    Review of JT-60U Experimental Results in 2007 and 2008   Vol. JAEA-Review 2009-045   page: 116   2010

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  45. 8.2 Fluctuation Characteristics of the L-mode and H-mode SOL Plasmas

    H.Tanaka, N.Ohno, N.Asakura, Y.Tsuji, H.Kawashima, S.Takamura, Y.Uesugi

    Review of JT-60U Experimental Results in 2007 and 2008   Vol. JAEA-Review 2009-045   page: 112 - 115   2010

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  46. 6.8 Study of Current Decay Time during Disruption in JT-60U Tokamak Review of JT-60U Experimental Results in 2007 and 2008

    Y.Shibata, M.Okamoto, K.Y.Watanabe, N.Ohno, A.Isayama, K.Kurihara, T.Nakano, N.Oyama, Y.Kawano, G.Matsunaga, S.Sakakibara, M.Sugihara, Y.Kamada and the JT-60U team

    Review of JT-60U Experimental Results in 2007 and 2008   Vol. JAEA-Review 2009-045   page: 84 - 87   2010

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  47. Conclusion

    OHNO Noriyasu

      Vol. 85 ( 12 )   2009.12

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  48. 名古屋大学大学院工学研究科エネルギー理工学専攻 プラズマ物性工学研究グループ

    大野 哲靖

    電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society   Vol. 129 ( 12 )   2009.12

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    DOI: 10.1541/ieejfms.129.931

  49. 燃焼科学とプラズマ科学の融合 : プラズマ支援燃焼

    佐々木 浩一, 上杉 喜彦, 大野 哲靖, 大坂 侑吾

    日本燃焼学会誌   Vol. 51 ( 158 ) page: 259 - 267   2009.11

  50. 流体およびプラズマ乱流の普遍性

    辻 義之, 田中 宏彦, 大野 哲靖

    プラズマ・核融合学会誌   Vol. 85 ( 11 ) page: 783 - 792   2009.11

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  51. 組織構造の定義とその抽出

    辻 義之, 田中 宏彦, 大野 哲靖

    プラズマ・核融合学会誌   Vol. 85 ( 11 ) page: 774 - 782   2009.11

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  52. 確率密度関数とその応用

    辻 義之, 田中 宏彦, 大野 哲靖

    プラズマ・核融合学会誌   Vol. 85 ( 10 ) page: 665 - 673   2009.10

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  53. Introduction

    OHNO Noriyasu

      Vol. 85 ( 9 ) page: 618 - 619   2009.9

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  54. 相関とスペクトル解析

    辻 義之, 田中 宏彦, 大野 哲靖

    プラズマ・核融合学会誌   Vol. 85 ( 9 ) page: 620 - 630   2009.9

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