Faculty Profiles - OHNO, Noriyasu

Papers - OHNO, Noriyasu

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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

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

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

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

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

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

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

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

Observation of Funnel-Shaped Dust Cloud Composed of Multiple Layers Reviewed Open Access

MISAWA T., NUNOMURA S., ASANO K., OHNO N., TAKAMURA S.

Meeting Abstracts of the Physical Society of Japan Vol. 53 ( 0 ) 1998

Experimental evidence of molecular activated recombination in detached recombining plasmas Reviewed International coauthorship International journal Open Access

Ohno N., Ezumi N., Takamura S., Krasheninnikov S.I., Pigarov A.Y.

Physical Review Letters Vol. 81 ( 4 ) page： 818 - 821 1998

Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review Letters

Molecular activated recombination (MAR) has been clearly observed for the first time in a divertor plasma simulator. A small amount of hydrogen gas puffing into a helium plasma strongly reduced the ion particle flux along the magnetic field, although the conventional radiative and three-body recombination processes were quenched. Careful comparison of the observed helium Balmer spectra with collisional radiative atomic and molecular data indicates that the population distribution over the atomic levels with relatively low principal quantum numbers can be well explained by taking the MAR effects into account. © 1998 The American Physical Society.

DOI： 10.1103/PhysRevLett.81.818

Open Access

Scopus

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

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.

CiNii Research

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

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

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

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

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

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

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

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 Open Access

大野哲靖

プラズマ・核融合学会誌 Vol. 73 ( 8 ) page： 827-833 1997

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 Open Access

大野哲靖

プラズマ・核融合学会誌 Vol. 73 ( 7 ) page： 682-687 1997

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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