Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
analyses with ferromagnetic and plasma rotation effects and wall geometry for a high steady state tokamakKurita, Genichi; Bialek, J.*; Tsuda, Takashi; Azumi, Masafumi*; Ishida, Shinichi; Navratil, G. A.*; Sakurai, Shinji; Tamai, Hiroshi; Matsukawa, Makoto; Ozeki, Takahisa; et al.
Nuclear Fusion, 46(2), p.383 - 390, 2006/02
Times Cited Count：9 Percentile：31.17(Physics, Fluids & Plasmas)It is shown that critical beta is decreased by ferromagnetic effect by about 8% for 
/
2, and denoting the permeability of ferromagnetic wall and vacuum, respectively, for tokamak of aspect ratio 3. The existence of the stability window for resistive wall mode opened by both effects of the toroidal plasma rotation and the plasma dissipation, which was not observed for high aspect ratio tokamak, is found for tokamak of aspect ratio 3. The effect of ferromagnetism on them is also investigated. The critical beta analyses of NCT (National Centralized Tokamak) plasma using VALEN code are started with stabilizing plate and vacuum vessel geometry with finite resistivity, and the results for passive effect of stabilizing plate are obtained. The calculations including stabilizing effect of the vacuum-vessel and also active feedback control are also performed for present design of NCT plasma.
plasma operationTamai, Hiroshi; Akiba, Masato; Azechi, Hiroshi*; Fujita, Takaaki; Hamamatsu, Kiyotaka; Hashizume, Hidetoshi*; Hayashi, Nobuhiko; Horiike, Hiroshi*; Hosogane, Nobuyuki; Ichimura, Makoto*; et al.
Nuclear Fusion, 45(12), p.1676 - 1683, 2005/12
Times Cited Count：15 Percentile：45.44(Physics, Fluids & Plasmas)Design studies are shown on the National Centralized Tokamak facility. The machine design is carried out to investigate the capability for the flexibility in aspect ratio and shape controllability for the demonstration of the high-beta steady state operation with nation-wide collaboration, in parallel with ITER towards DEMO. Two designs are proposed and assessed with respect to the physics requirements such as confinement, stability, current drive, divertor, and energetic particle confinement. The operation range in the aspect ratio and the plasma shape is widely enhanced in consistent with the sufficient divertor pumping. Evaluations of the plasma performance towards the determination of machine design are presented.
Matsumoto, Taro; Naito, Hiroshi*; Tokuda, Shinji; Kishimoto, Yasuaki*
Nuclear Fusion, 45(11), p.1264 - 1270, 2005/11
Times Cited Count：14 Percentile：43.56(Physics, Fluids & Plasmas)A gyrokinetic particle simulation is executed to clarify the effect of the electron inertia on the MHD phenomena in the reversed shear configuration (RSC) of a cylindrical tokamak plasma. It is found that the collisionless (kinetic) double tearing modes grow up at the Alfv
n time scale, and nonlinearly induce the internal collapse when the helical flux at the magnetic axis is less than that at the outer resonant surface. After the internal collapse, the secondary reconnection is induced by the current concentration due to the 
convective flow. It is also clarified that a nonlinear dynamics accompanied with the elementary processes caused by the flow can generate a new RSC with resonant surfaces. In the presence of the density gradient, after the full reconnection induced by the mode, the radial electric field is found to be generated due to the difference of the 
motion between ions and electrons. However, the intensity of the radial field is not so large as that induced by the collisionless kink mode.
Kurita, Genichi; Tsuda, Takashi; Azumi, Masafumi; Ishida, Shinichi; Takeji, Satoru*; Sakasai, Akira; Matsukawa, Makoto; Ozeki, Takahisa; Kikuchi, Mitsuru
Nuclear Fusion, 43(9), p.949 - 954, 2003/09
Times Cited Count：31 Percentile：67.13(Physics, Fluids & Plasmas)In order to improve economic and environmental suitability of tokamak fusion reactors, both the accomplishment of high beta plasmas and the practical use of low activation materials to reduce the amount of radioactive waste are crucially important. Low radio-activation ferritic steel is considered as a most promising candidate for structural material in DEMO reactors, and there is the possibility of reduction of critical beta value by the deterioration of MHD stability due to ferromagnetism of ferritic steel. This paper investigates the effect of ferromagnetism with plasma flow on the beta limit of tokamak plasma by carrying out MHD stability analyses including ferromagnetic and plasma flow effects.
Utsumi, Takayuki*; Koga, J. K.; Kunugi, Tomoaki*
Parallel Computational Fluid Dynamics; New Frontiers and Multi-Disciplinary Applications, p.539 - 546, 2003/00
no abstracts in English
n eigenmodes in tokamak plasmasFukuyama, Atsushi*; Ozeki, Takahisa
Purazuma, Kaku Yugo Gakkai-Shi, 75(5), p.537 - 547, 1999/05
no abstracts in English
*; Takizuka, Tomonori; Hatayama, Akiyoshi*; *
Journal of Nuclear Materials, 266-269, p.526 - 531, 1999/00
Times Cited Count：3 Percentile：28.64(Materials Science, Multidisciplinary)no abstracts in English
*; Kunugi, Tomoaki; Koga, J. K.
Computer Physics Communications, 108(2-3), p.159 - 179, 1998/00
Times Cited Count：14 Percentile：62.89(Computer Science, Interdisciplinary Applications)no abstracts in English
Yamagiwa, Mitsuru; Hirose, A*; Elia, M.*
PPL-163, 22 Pages, 1997/01
no abstracts in English
Yamagiwa, Mitsuru; Hirose, A*; Elia, M.*
Plasma Physics and Controlled Fusion, 39(3), p.531 - 540, 1997/00
Times Cited Count：6 Percentile：24.39(Physics, Fluids & Plasmas)no abstracts in English
Tokuda, Shinji; *
JAERI-Research 96-044, 102 Pages, 1996/08
JAERI-Research-96-044.pdf:2.3MB
no abstracts in English
Yoshino, Ryuji; Neyatani, Yuzuru; Isei, Nobuaki; Koide, Yoshihiko; Kawano, Yasunori; A.Tanga*; Campbell, D. J.*; M.F.Johnson*; L.Rossi*
IAEA-CN-60/A5-8, 0, p.685 - 695, 1995/00
no abstracts in English
Yamagiwa, Mitsuru
Nuclear Fusion, 35(10), p.1225 - 1230, 1995/00
Times Cited Count：0 Percentile：0.02(Physics, Fluids & Plasmas)no abstracts in English
D.A.Humphreys*; Yoshino, Ryuji
JAERI-M 92-069, 25 Pages, 1992/05
no abstracts in English
Azumi, Masafumi; Hasegawa, Mitsuru*; *; Kurihara, Kenichi; Nakamura, Yukiharu; Nishio, Satoshi; Shimomura, Yasuo; Shinya, K.*; Sugihara, Masayoshi; *; et al.
JAERI-M 92-041, 100 Pages, 1992/03
no abstracts in English
Ozeki, Takahisa; Azumi, Masafumi; Kamada, Yutaka; Yoshino, Ryuji; Tokuda, Shinji; Tsunematsu, Toshihide; Nagashima, Keisuke; Yoshida, Hidetoshi;
Nuclear Fusion, 31(1), p.51 - 60, 1991/00
Times Cited Count：8 Percentile：41.47(Physics, Fluids & Plasmas)no abstracts in English
Ozeki, Takahisa; M.S.Chu*; L.L.Lao*; T.S.Taylor*; M.S.Chance*; *; K.H.Burrell*; R.D.Stambaugh*
Nuclear Fusion, 30(8), p.1425 - 1432, 1990/08
Times Cited Count：116 Percentile：93.27(Physics, Fluids & Plasmas)no abstracts in English
Takeda, Tatsuoki; Tsunematsu, Toshihide; ; ;
Computational Mechanics 86;Theory and Applications, p.9 - 3, 1986/00
no abstracts in English
*; ; ; Tsunematsu, Toshihide; Takeda, Tatsuoki
Comput.Phys.Commun., 38, p.339 - 346, 1985/00
Times Cited Count：1 Percentile：20.87(Computer Science, Interdisciplinary Applications)no abstracts in English
JAERI-M 84-077, 49 Pages, 1984/04
no abstracts in English
