Faculty Profiles - OHNO, Noriyasu

Papers - OHNO, Noriyasu

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CD-ROM Study on Plasma Dynamics Using Scientific Animation II Reviewed

Vol. 75 ( 10 ) 1999.10

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

Publisher：The Japan Society of Plasma Science and Nuclear Fusion Research

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

Molecular activated recombination in detached recombining plasmas - Reply Reviewed International coauthorship International journal

Ohno N, Ezumi N, Takamura S, Krasheninnikov SI, Pigarov AY

PHYSICAL REVIEW LETTERS Vol. 82 ( 10 ) page： 2216 - 2216 1999.3

Two-dimensional structure of the detached recombining helium plasma associated with molecular activated recombination Reviewed International coauthorship International journal

Nishijima D., Ezumi N., Kojima H., Ohno N., Takamur S., Krasheninnikov S., Pigarov A.

Journal of Nuclear Materials Vol. 266 page： 1161 - 1166 1999.3

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

The structural change of the detached plasmas associated with the molecular activated recombination (MAR) has been studied in a high density helium plasma with helium or hydrogen puff in the linear divertor plasma simulator, NAGDIS-II. The ion particle flux with the hydrogen gas puff starts to decrease in the upstream region close to the plasma source, compared to that with the helium puff. The reduction of the ion particle flux along the magnetic field is found to depend on the plasma density. With the hydrogen gas puff, the attenuation of the ion particle flux is getting smaller as increasing plasma density, which is opposite tendency in pure helium detached plasma where the conventional electron-ion recombination (EIR) is dominating.

DOI： 10.1016/S0022-3115(98)00565-0

Scopus

Contribution of molecular activated recombination to hydrogen plasma detachment in the divertor plasma simulator NAGDIS-II Reviewed International coauthorship International journal

Ezumi N., Nishijima D., Kojima H., Ohno N., Takamura S., Krasheninnikov S., Pigarov A.

Journal of Nuclear Materials Vol. 266 page： 337 - 342 1999.3

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

We have performed experiments on detached hydrogen plasmas associated with molecular activated recombination (MAR) in a linear divertor plasma simulator. Reductions of the ion particle flux and heat load to the target plate were clearly observed in hydrogen plasmas with the hydrogen gas puff. Detailed analysis of Balmer series spectra with the Collisional-Radiative Atomic-Molecular data (CRAMD) code shows that MAR mainly appears as a weak dependence of the Balmer series emission intensities on experimental conditions in detached hydrogen plasmas. The plasma conditions necessary to obtain plasma detachment through MAR or EIR (electron ion recombination including the radiative and three-body recombination) in tokamak divertors are also discussed.

DOI： 10.1016/S0022-3115(98)00533-9

Scopus

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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Papers - OHNO, Noriyasu