研究者詳細 - 大野　哲靖

論文 - 大野　哲靖

分割表示 657 件中 261 - 280 件目／全件表示 >>

Deuterium Atomic Density Estimation in Recombining Plasmas Using Self-Absorption Spectroscopy 査読有り

S.Kajita, T.Nishiwaki, N.Ohno, K.Sawada, M.Takagi

IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING 8 巻 ( 1 ) 頁： 1-6 2013年

Intermittent transport in edge plasma with a 3-D magnetic geometry in the Large Helical Device 査読有り

H.Tanaka, S.Masuzaki, N.Ohno, T.Morisaki, Y.Tsuji, the LHD Experiment Group

Journal of Nuclear Materials 438 巻頁： S563-S566 2013年

Observation of Arc Spots Initiated on Nanostructured Tungsten 査読有り

S.Kajita, N.Ohno, S.Takamura

IEEE TRANSACTIONS ON PLASMA SCIENCE 41 巻 ( 8, Part 2 ) 頁： 1889-1895 2013年

Extension of operation regimes and investigation of three-dimensional currentless plasmas in the Large Helical Device 査読有り

O.Kaneko, H.Yamada, S.Inagaki, M.Jakubowski, S.Kajita, et al.(N.Ohno is the 104th author))

Nucl. Fusion 53 巻頁： 104015(11 pp) 2013年

First-Principles Investigation on Trapping of Multiple Helium Atoms within a Tungsten Monovacancy 査読有り

A.Takayama, A.M.Ito, S.Saito, N.Ohno, H.Nakamura

Jpn. J. Appl. Phys. 52 巻頁： 01AL023(4 pp) 2013年

Effect of resistivity profile on current decay time of initial phase of current quench in neon-gas-puff inducing disruptions of JT-60U 査読有り

S.Kawakami, Y.Shibata, K.Y.Watanabe, N.Ohno, A.Isayama, T.Takizuka, Y.Kawano, M.Okamoto

Physics of Plasmas 20 巻頁： 112507(6 pp) 2013年

Degradation of optical reflectivity of in-vessel mirror materials by helium bombardment 査読有り

S.Kajita, M.Tokitani, T.Saekim N.Ohno, N.Yoshida

J. Nucl. Mater. 417 巻頁： 838-841 2013年

Behavior of Plasma Response Field in Detached Plasma 査読有り国際誌

NARUSHIMA Yoshiro, KOBAYASHI Masahiro, AKIYAMA Tsuyoshi, SAKAKIBARA Satoru, MASUZAKI Suguru, ASHIKAWA Naoko, OHNO Noriyasu

Plasma and Fusion Research 8 巻 ( 0 ) 頁： 1402058 - 1402058 2013年

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：プラズマ・核融合学会

Sustaining a detached plasma is important for the reduction of the heat load on a divertor. The externally controlled methods such as gas puffing in the divertor region, etc. have been studied for maintaining detached plasmas. In the recent LHD experiments, a resonant magnetic perturbation (RMP) is utilized to establish the detached plasma, which is one of the candidates to reduce the divertor heat load. The finite plasma response field has been detected when the RMP is imposed, and its behavior is investigated from the viewpoint of the magnetic island dynamics. A parameter of the phase difference, Δθ (defined as the phase difference between the plasma response field and the RMP), changes from antiphase to in-phase while the plasma transits from the attached to the detached states. Finally, when the Δθ reaches at certain critical value, Δθcrit, the plasma enters the detached state. Since this critical value does not have a dependency on plasma beta and collisionality, Δθcrit seems to be a threshold to establish the detached plasma. From the viewpoint of magnetic island dynamics, the behavior of Δθ approaching in-phase implies the "trend" of island growth. The detached plasma might be established in the case of the tendency for the plasma response field to reinforce the island width.

DOI： 10.1585/pfr.8.1402058

Thermal radiation characteristics and direct evidence of tungsten cooling on the way to nanostructure formation on its surface 査読有り国際誌

Takamura S., Miyamoto T., Ohno N.

Journal of Nuclear Materials 438 巻 ( SUPPL ) 2013年

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Nuclear Materials

The physical properties of tungsten with nanostructure on its surface are investigated focusing on the thermal radiation and cooling characteristics. First, direct evidence of substantial W surface cooling has been clearly shown with use of a very thin thermocouple inserted into W target, which solves an uncertainty associated with a radiation thermometer. Second, the above measurements of W surface temperature make it possible to estimate quantitatively the total emissivity from which we may evaluate the radiative power through the Stefan-Boltzmann equation, which is very important for mitigation evaluation of a serious plasma heat load to the plasma-facing component. © 2013 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jnucmat.2013.01.176

Scopus

Preliminary experiments on the vertical stability with helical coils in a small tokamak, HYBTOK-II 査読有り国際誌

Hatakeyama S., Shibata Y., Kawakami S., Tsutsui H., Tsuji-Iio S., Shimada R., Ohno N., Akiyama T., Suzuki Y., Watanabe K.

39th EPS Conference on Plasma Physics 2012, EPS 2012 and the 16th International Congress on Plasma Physics 1 巻頁： 285 - 288 2012年12月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：39th EPS Conference on Plasma Physics 2012, EPS 2012 and the 16th International Congress on Plasma Physics

In summary, we proposed saddle shaped stellarator system for vertical mode in toka-mak. These preliminary results demonstrate the feasibility of vertical stability, even if only two selected coils which are localized at one side of the torus. However as noted earlier, the experiment were conducted with the circular cross-section tokamak which is stable vertically. Further work is needed to confirm the improvement in the vertical stability in elongated tokamaks. In addition, very large coil current comparable to the plasma current are needed in our system. In order to reduce the current, future work also should focus on optimal configuration of the coils.

Scopus

Blob/Hole Generation in the Divertor Leg of the Large Helical Device 査読有り

H.Tanaka, N.Ohno, Y.Tsuji, S.Kajita, S.Masuzaki, M.Kobayashi, T.Morisaki, A.Komori and the LHD Experimental Group

Plasma and Fusion Research 7 巻頁： 1402152(6 pp) 2012年11月

Fatal Damages due to Breakdown on a Diagnostic Mirror Located outside the Vacuum Vessel in JT-60U 査読有り

S.Kajita, T.Hatae, T.Sakuma, S.Takamura, N.Ohno, K.Itami

Plasma and Fusion Research 7 巻頁： 2405121(4 pages) 2012年9月

Optical properties of nanostructured tungsten in near infrared range 査読有り

S.Kajita, N.Ohno, T.Yokochi, N.Yoshida, R.Yoshihara, S.Takamura, T.Hatae

Plasma Physics and Controlled Fusion 54 巻頁： 105015(7 pages) 2012年9月

Superimposition of Pulses to Steady Arc Discharge in Toroidal Divertor Simulator 査読有り

S.Kajita, T.Uchiyama, N.Ohno

Plasma and Fusion Research 7 巻頁： 1405100(6 pages) 2012年7月

Statistical Analysis of the Spatial Behavior of Plasma Blobs Around the Plasma Column in a Linear Plasma Device 査読有り

H.Tanaka, N.Ohno, Y.Tsuji, K.Okazaki, S.Kajita

Contrib. Plasma Phys. 52 巻 ( 5-6 ) 頁： 424 - 428 2012年6月

Effect of Externally Applied Resonance Magnetic Perturbation on Current Decay during Tokamak Disruption 査読有り

Y.Kanazawa, Y.Shibata, M.Okamoto, N.Ohno, S.Kajita

Plasma and Fusion Research 7 巻頁： 1202049(2 pages) 2012年6月

Effect of neutral pressure on the He plasma flow measurement in a linear device 査読有り国際共著

E.-K.Park, H.-J.Woo, K.-S.Chung, H.Tanaka, S.Kajita, N.Ohno

Current Applied Physics 12 巻頁： 1479 - 1502 2012年5月

Transition in Plasma Fluctuation between Attached and Detached Plasmas 査読有り

K.Okazaki, H.Tanaka, N.Ohno, S.Kajita

Plasma and Fusion Research 7 巻頁： 1201033(2 pages) 2012年4月

Arcing on tungsten subjected to helium and transients: ignition conditions and erosion rates 査読有り国際誌

Kajita Shin, Ohno Noriyasu, Yoshida Naoaki, Yoshihara Reiko, Takamura Shuichi

PLASMA PHYSICS AND CONTROLLED FUSION 54 巻 ( 3 ) 2012年2月

TEM analysis of high temperature annealed W nanostructure surfaces 査読有り国際誌

Kajita Shin, Yoshida Naoaki, Yoshihara Reiko, Ohno Noriyasu, Yokochi Takanori, Tokitani Masayuki, Takamura Shuichi

JOURNAL OF NUCLEAR MATERIALS 421 巻 ( 1-3 ) 頁： 22 - 27 2012年2月

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