Faculty Profiles - OHNO, Noriyasu

Papers - OHNO, Noriyasu

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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

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

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

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

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

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

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

Divertor simulation experiment and its future research plan making use of a large tandem mirror device Reviewed International journal

Nakashima Y., Takeda H., Hosoi K., Yonenaga R., Katanuma I., Ichimura K., Ichimura M., Imai T., Ishii T., Kariya T., Kiwamoto Y., Minami R., Miyata Y., Ozawa H., Shidara H., Yamaguchi Y., Yoshikawa M., Asakura N., Hatayama A., Higashizono Y., Kado S., Masuzaki S., Nishino N., Ohno N., Ueda Y.

Journal of Nuclear Materials Vol. 415 ( 1 SUPPL ) 2011.8

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Nuclear Materials

Divertor simulation study has been started as a new research plan, by making best use of a large linear plasma device. The experiment of generating the plasma flow with high heat and particle flux was successfully performed at an end-mirror exit of the GAMMA 10 tandem mirror. In typical hot-ion-mode plasmas, the heat-flux density of 0.6 MW/m2 and the particle-flux density of 1022 particles/s m2 were simultaneously achieved in the case of only ICRF heating and superimposing the 300 kW ECH pulse attained the peak value of the net heat-flux up to 8 MW/m2 on axis. The above experimental results and the simulation analysis of ICRF heating using the Fokker-Planck code give a clear prospect of generating the required performance for divertor studies by building up the plasma heating systems to the end-mirror cell. Detailed behavior of the plasma flow and the future research plan are also described. © 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jnucmat.2010.11.081

Scopus

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

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

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

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

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

Practical selection of emission lines of He I to determine the photon absorption rate Reviewed Open Access

S.Kajita, N.Ohno

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

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

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

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

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

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

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

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

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, β<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 β<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

CiNii Research

Midterm summary of Japan-US fusion cooperation program TITAN Reviewed International journal

Muroga T., Sze D.K., Okuno K., Terai T., Kimura A., Kurtz R.J., Sagara A., Nygren R., Ueda Y., Doerner R.P., Sharpe J.P., Kunugi T., Morley N.B., Hatano Y., Sokolov M.A., Yamamoto T., Hasegawa A., Katoh Y., Ohno N., Tokunaga K., Konishi S., Fukada S., Calderoni P., Yokomine T., Messadek K., Oya Y., Hashimoto N., Hinoki T., Hashizume H., Norimatsu T., Shikama T., Stoller R.E., Tanaka K.A., Tillack M.S.

Fusion Science and Technology Vol. 60 ( 1 ) page： 321 - 328 2011

Language：English Publishing type：Research paper (scientific journal) Publisher：Fusion Science and Technology

Japan-US cooperation program TITAN (Tritium, Irradiation and Thermofluid for America and Nippon) started in April 2007 as 6-year project. This is the summary report at the midterm of the project. Historical overview of the Japan-US cooperation programs and direction of the TITAN project in its second half are presented in addition to the technical highlights.

DOI： 10.13182/FST11-A12373

Scopus

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Papers - OHNO, Noriyasu