研究者詳細 - 大野　哲靖

論文 - 大野　哲靖

分割表示 657 件中 361 - 380 件目／全件表示 >>

ELM propagation in the low- and high- filed-side Scrape-off Layer of the JT-60U tokamak 査読有り

N.Asakura, H.Kawashima, N.Ohno, G.Matsunaga, T.Nakano and N.Oyama

Journal of Physics; Conference Series 123 巻頁： 012009(11pp) 2008年

Statistical properties of edge plasma turbulence in the Large Helical Device 査読有り

J.M.Dewhurst, B.Hnat, N.Ohno, R.O.Dendy, S.Masuzaki, T.Morisaki and A.Komori

Plasma Physics and Controlled Fusion 50 巻頁： 095013(15pp) 2008年

Fluctuating Helium Emission in Optically Thick Divertor Plasmas 査読有り

F. B. Rosmej, N. Ohno, S. Takamura, S. Kajita

Contributions to Plasma Physics 48 巻頁： 243-248 2008年

Numerical Modeling of Behavior of Dust Made of Different Materials in Plasmas 査読有り

Y. Tanaka, A. Yu. Pigarov, R. D. Smirnov, S. I. Krasheninnikov, N. Ohno, Y. Uesugi

Contributions to Plasma Physics 48 巻頁： 295-299 2008年

Extended Self-Similarity in Edge Plasma Turbulence of Fusion Devices 査読有り

V. P. Budaev, N. Ohno, S. Takamura, S. Masuzaki, A. Komori, T. Morisaki

Contributions to Plasma Physics 48 巻頁： 42-47 2008年

Plasma Rotation Measurements by Passive Spectroscopic Method in the HYBTOK-II using a Dynamic Ergodic Divertor 査読有り

Y.Hasebe, M.Okamoto, S.Kajita, N.Ohno and S.Takamura

Plasma and Fusion Research 3 巻頁： S1015 2008年

ELM propagation in the low- and high-field-side scrape-off layer of the JT-60U tokamak 査読有り国際誌

Asakura N., Kawashima H., Ohno N., Matsunaga G., Nakano T., Oyama N.

Journal of Physics: Conference Series 123 巻 2008年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Physics: Conference Series

In JT-60U, the filament structure of Edge Localized Modes (ELMs) is measured at three poloidal locations, and their temporal evolution is investigated at the inner (high magnetic-field-side, HFS) SOL as well as outer (low magnetic-field-side, LFS) SOL. At the inner SOL, filament structure with 7-8 temporal multi-peaks in ion-saturation probe signals and other diagnostics is, for the first time, measured close to the sepatratrix. The delay of the first peak after the start of MHD activity is faster than the characteristic time of the parallel convection from the outer midplane, and the Mach numbers of the plasma parallel flow reach ion sonic levels. These results show that ELM filaments extend from the outer to the inner plasma edge, and that a part of the filaments are ejected into the inner SOL. The toroidal mode numbers (n) and poloidal width of the filaments (δz) are evaluated from the interval of the multi-peaks and duration of each peak, yielding n ∼ 18-44 and δz ∼ 2-6 cm on the HFS SOL, while n and δz are comparable on the LFS SOL. After the multi-peaks appear, flow reversal of the SOL plasma toward is observed over a wide region of the inner SOL. © 2008 IOP Publishing Ltd.

DOI： 10.1088/1742-6596/123/1/012009

Scopus

Plasma-assisted laser ablation of tungsten: Reduction in ablation power threshold due to bursting of holes/bubbles 査読有り国際誌

Kajita S., Ohno N., Takamura S., Sakaguchi W., Nishijima D.

Applied Physics Letters 91 巻 ( 26 ) 2007年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Applied Physics Letters

Nanosecond laser ablation of tungsten (W) exposed to helium plasma is investigated using optical emission spectroscopy. Submicrometer-sized holes/bubbles are formed on the surface of W when it was exposed to the helium plasma at a sufficiently high temperature (1500-1600 K). The emissions from a virgin W (before the helium plasma irradiation) cannot be detected when the fluence is <1 J cm2; however, the threshold fluence for the detection of neutral W emission after it was exposed to the helium plasma is ∼0.2 J cm2. The physical mechanism of laser-induced bursting of holes/bubbles is proposed for achieving a significant reduction in ablation power threshold. © 2007 American Institute of Physics.

DOI： 10.1063/1.2824873

Scopus

Effect of cross-field transport on H<sup>-</sup> density profile in magnetized plasmas: Comparison between measurement and simulation 査読有り国際誌

Kajita S., Kado S., Ohno N., Takamura S., Kurihara K., Kuwahara Y.

Physics of Plasmas 14 巻 ( 10 ) 2007年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physics of Plasmas

The radial density profile of negative hydrogen ions in magnetized plasma is investigated in the divertor simulator MAP (Material and plasma)-II [S. Kado et al., J. Plasma Fusion Res. 71, 810 (2005)] by measurement and numerical simulation. The laser photodetachment method is used to evaluate the H - density by considering the influence of the magnetic field. The density of H- has a hollow profile and exhibits a peak in the peripheral region, though the electron density and temperature exhibit a peak at the center of the plasma column. The density profile of H- does not agree with the calculation result obtained from, the rate equation, in which the local production and extinction rates are balanced, under the present experimental condition. To understand the behavior of negative ions, their trajectories are calculated by numerically solving the equation of motion by considering the effect of collisions. The negative ion density profile calculated from the particle simulation agrees well with the measured negative ion density profile. It is shown that the cross-field H- transport due to the radial electric field with the assistance of the elastic collisions plays an important role in enhancing the negative ion density in the peripheral region. © 2007 American Institute of Physics.

DOI： 10.1063/1.2789559

Scopus

Sub-ms Laser Pulse Irradiation on Tungsten Target Damaged by Exposure to Helium Plasma 査読有り

S.Kajita, S.Takamura, N.Ohno, D.Nishijima, H.Iwakiri, N.Yoshida

Nuclear Fusion 47 巻頁： 1358 - 1366 2007年9月

Integrated view of disruption dynamics on internal electromagnetic and plasma structures in the small tokamak HYBTOK-II 査読有り

M. Okamoto, S. Takamura, N. Ohno, S. Kajita, Y. Kikuchi, Y. Uesugi, T. Ozeki, Y. Kawano, M. Sugihara

Nuclear Fusion 47 巻頁： 1106 - 1111 2007年8月

Surface modification at tungsten and tungsten coated graphite due to low energy and high fluence plasma and laser pulse irradiation 査読有り国際誌

Ohno N., Kajita S., Nishijima Dai, Takamura S.

JOURNAL OF NUCLEAR MATERIALS 363 巻頁： 1153 - 1159 2007年6月

Modeling of Dust-particle Behavior for Different Materials in Plasmas 査読有り

Y.Tanaka, A.Yu.Pigarov, R.D.Smirnov, S.I.Krasheninnikov, N.Ohno, Y.Uesugi

Physics of Plasmas 14 巻頁： 52504 2007年5月

Systematic Analysis of Current Decay Time during Disruption in HYBTOK-II Tokamak 査読有り

M.Okamoto, N.Ohno, S.Takamura

Plasma and Fusion Research 3 巻頁： 6 2007年

Effect of Cross-field Transport on H-Density Profile in Magnetized Plasmas: Comparison Between Measurement and Simulation 査読有り

S.Kajita, S.Kado, N.Ohno, K.Kurihara, Y.Kuwahara, S.Takamura

Physics of Plasmas 14 巻頁： 103503 2007年

Plasma-assisted Laser Ablaion of Tungsten: Reduction in Ablation Power Threshold Due to Bursting of Holes/Bubbles 査読有り

S.Kajita, N.Ohno, S.Takamura, W.Sakaguchi, D.Nishijima

Applied Physics Letters 9191 巻頁： 261501 2007年

Development of Tungsten Materials for Plasma Facing Components in Japan 査読有り

Y.Ueda, N.Ohno, S.Kajita, H.Kurishita, H.Iwakiri et al

Fusion Science and Technology 52 巻頁： 513-520 2007年

Overview of JT-60U results for the Development of a Steady-state Advanced Tokamak Scenario 査読有り

H.Takenaga, the JT-60 Team

Nuclear Fusion 47 巻頁： S563-S578 2007年

Structural Bifurcation of Microwave Helium Jet Discharge at Atmospheric Pressure 査読有り

S.TAKAMURA, M.KITOH, T.SOGA, H.TAKASHIMA, Y.NISHINO, S.HAYAKAWA, Y.BAN, T.YUHKI, M.KANDO, N.OHNO

Plasma and Fusion Research 3 巻頁： 12 2007年

High density plasma generation by RF ohmic discharge in toroidal divertor simulator NAGDIS-T 査読有り

M. Nagase, H. Masuda, N. Ohno, S. Takamura and M. Takagi

Journal of Nuclear Materials 363-365 巻頁： 611-615 2007年

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