Faculty Profiles - OHNO, Noriyasu

Papers - OHNO, Noriyasu

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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

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

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

J. Nuclear Mater. 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

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 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

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

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

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 β steady state operation in limiter configuration, II. low β steady state operation in divertor configuration, III. relatively high β 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

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

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

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

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

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

Deuterium retention in tungsten oxide under low energy D<inf>2</inf><sup>+</sup> plasma exposure Reviewed International journal

Matsunami N., Ohno N., Tokitani M.

Journal of Nuclear Materials Vol. 390-391 ( 1 ) page： 693 - 695 2009.6

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

W is a candidate for plasma facing material and oxide layers are highly anticipated on W surface. We have studied deuterium (D) retention in tungsten oxide (WO3) films and thermal release of deuterium. WO3 films, prepared by oxidation of W metal sheet, were exposed to D2 plasma under AC glow discharge at the applied voltage V up to a few kV and DC discharge. D-retention in W has been studied for comparison. The amount of D retained in the WO3 films and W were analyzed by detecting α particles from the nuclear reaction, D(3He, α)p, using 0.7 MeV 3He+ ions. We find that D-uptake in WO3 film is much larger than in W. According to thermal desorption, release of D2 occurs at ∼180 and 450 °C. © 2009 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jnucmat.2009.01.191

Scopus

Erratum: Comparison of He I line intensity ratio method and electrostatic probe for electron density and temperature measurements in NAGDIS-II (Physics of Plasmas (2006) 13 (013301)) Reviewed International journal

Kajita S., Ohno N., Takamura S., Nakano T.

Physics of Plasmas Vol. 16 ( 2 ) 2009.3

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

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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Papers - OHNO, Noriyasu