Faculty Profiles - OHNO, Noriyasu

Papers - OHNO, Noriyasu

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Deuterium uptake in iron oxide (Fe<inf>2</inf>O<inf>3</inf>) under D <inf>2</inf>+-plasma exposure Reviewed International journal

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

AIP Conference Proceedings Vol. 1321 page： 274 - 277 2010.12

Language：English Publishing type：Research paper (scientific journal) Publisher：AIP Conference Proceedings

We have studied implantation of low-energy deuterium ions into Fe 2O3 films and deuterium (D)-uptake in Fe2O 3 films, which were prepared by oxidation of Fe sheets in air at 400°C for 20 min. X-ray diffraction (XRD) shows that the films are mixture of hexagonal α-Fe2O3 (hematite) and cubic γ-Fe2O3 (maghemite). According to Rutherford backscattering spectroscopy (RBS) of 1.8 MeV H+, the composition is found to be crudely stoichiometric (Fe:O=2:3). The samples were subjected to D2+-plasma exposure using AC-glow discharge. The amount of D-uptake in Fe2O3 is evaluated to be ∼6×10 16cm2 for AC voltage of 1.5 kV in 0.4 Torr of D 2 gas for 15 min. The amount of D-uptake in Fe2O 3 appears to be larger by a factor of three than that in Fe. Comparisons of XRD patterns and RBS spectra before and after D2+-plasma exposure show no appreciable change of the crystalline structure, quality and composition. © 2010 American Institute of Physics.

DOI： 10.1063/1.3548377

Scopus

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

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

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

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

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

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

Language：English Publisher：社団法人プラズマ・核融合学会

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 N2 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

CiNii Research

Study of current decay time during disruption in JT-60U tokamak Reviewed Open Access

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

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

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

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

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

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

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

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

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

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

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

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

Degradation of optical reflectivity of in-vessel mirror materials by helium bombardment Reviewed Open Access

S.Kajita, T.Saeki, N.Ohno, M.Tokitani, T.Hatae, W.Sakaguchi

J. Nuclear Mater. 2010

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

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

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 Ein = 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

CiNii Research

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