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Connor, J. W.*; Fukuda, Takeshi*; Garbet, X.*; Gormezano, C.*; Mukhovatov, V.*; Wakatani, Masahiro*; ITB Database Group; ITPA Topical Group on Transport and Internal Barrier Physics*
Nuclear Fusion, 44(4), p.R1 - R49, 2004/04
Times Cited Count：287 Percentile：76.74(Physics, Fluids & Plasmas)This paper first reviews the present state of theoretical and experimental knowledge regarding the formation and characteristics of ITBs in tokamaks. Specifically, the current status of theoretical modeling of ITBs is presented; then, an international ITB database based on experimental information extracted from some nine tokamaks is described and used to draw some general conclusions concerning the necessary conditions for ITBs to appear, comparing these with the theoretical models. The experimental situation regarding the steady-state, or at least quasi-steady-state, operation of tokamaks is reviewed and finally the issues and prospects for achieving such operational modes in ITER are discussed.
Furukawa, Masaru; Tokuda, Shinji; Wakatani, Masahiro*
Plasma Physics and Controlled Fusion, 46(2), p.409 - 421, 2004/02
Times Cited Count：7 Percentile：23.71(Physics, Fluids & Plasmas)In the H-mode (high-confinement mode) pedestal region of a static or a toroidally rotating D-shaped tokamak plasma, the separatrix or the X-point affects the high-n ballooning stability (n: toroidal mode number) only in a thin layer in the pedestal region. Therefore, D-shaping effectively stabilizes the ballooning modes even for a toroidally rotating plasma with a separatrix.
Ishida, Shinichi; Abe, Katsunori*; Ando, Akira*; Chujo, T.*; Fujii, Tsuneyuki; Fujita, Takaaki; Goto, Seiichi*; Hanada, Kazuaki*; Hatayama, Akiyoshi*; Hino, Tomoaki*; et al.
Nuclear Fusion, 43(7), p.606 - 613, 2003/07
no abstracts in English
Ishida, Shinichi; Abe, Katsunori*; Ando, Akira*; Cho, T.*; Fujii, Tsuneyuki; Fujita, Takaaki; Goto, Seiichi*; Hanada, Kazuaki*; Hatayama, Akiyoshi*; Hino, Tomoaki*; et al.
Nuclear Fusion, 43(7), p.606 - 613, 2003/07
Times Cited Count：33 Percentile：70.26(Physics, Fluids & Plasmas)no abstracts in English
ballooning modes in tokamaksFurukawa, Masaru; Tokuda, Shinji; Wakatani, Masahiro*
Nuclear Fusion, 43(6), p.425 - 429, 2003/06
We have found numerically that damping phases appear in the time evolution of the perturbation energy of high- ballooning modes in the presence of toroidal shear flows. The damping dominates exponential growth which occurs in the bad curvature region, resulting in stabilization of ballooning modes. D-shaping of plasma cross-section, reduction of aspect ratio, and arrangement of X-point at inner side of the torus enhance the stabilization effect of the toroidal flow through this mechanism.
ballooning modes in tokamaksFurukawa, Masaru; Tokuda, Shinji; Wakatani, Masahiro*
Nuclear Fusion, 43(6), p.425 - 429, 2003/06
Times Cited Count：10 Percentile：32.43(Physics, Fluids & Plasmas)We have found numerically that damping phases appear in the time evolution of the perturbation energy of high- ballooning modes in the presence of toriodal flow shear, where n is a toroidal mode number. The damping dominates exponential growth which occurs in the bad curvature region, resulting in stabilization of ballooning modes. D-shaping of plasma cross-section, reduction of aspect ratio, and arrangement of an X-point at inner side of the torus enhance the stabilization effect of the toroidal flow shear through this mechanism.
Takamura, Shuichi*; Wakatani, Masahiro*; Ninomiya, Hiromasa; Kamada, Yutaka; Yatsu, Kiyoshi*; Hatae, Takaki; Sugihara, Masayoshi; Iio, Shunji*; Ozeki, Takahisa; Kawano, Yasunori
Purazuma, Kaku Yugo Gakkai-Shi, 79(1), P. 70, 2003/01
no abstracts in English
Ninomiya, Hiromasa; Takamura, Shuichi*; Wakatani, Masahiro*; Fujita, Takaaki; Fukuda, Takeshi; Toi, Kazuo*; Ogawa, Yuichi*; Takizuka, Tomonori; Miura, Yukitoshi; Hatae, Takaki; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 78(7), p.692 - 694, 2002/07
The second ITPA (International Tokamak Physics Activity) meeting was held at General Atomics (San Diego) and Princeton Plasma Physics Laboratory (Princeton) in U.S.A. In the meeting, topical physics group meetings of "Coordinating Committee", "Transport and Internal Barrier Physics", "Confinement Database and Modeling", "Edge and Pedestal Physics", "Scrape-off-layer and Divertor Physics", and "Diagnostics" were carried out. In getting many participants from Japan, Europe, Russia, ITER international team and U.S.A., the active discussions were carried out. On the other hand, the topical group members concerned that the contribution from Japan will be decreased if the experimental period of JT-60U is reduced. Here, the outline of discussions in each topical group is reported.
Wakatani, Masahiro*; Takamura, Shuichi*; Ninomiya, Hiromasa
Purazuma, Kaku Yugo Gakkai-Shi, 78(1), p.72 - 73, 2002/01
no abstracts in English
Ogawa, Yuichi*; Takizuka, Tomonori; Miura, Yukitoshi; Toi, Kazuo*; Fukuda, Takeshi; Wakatani, Masahiro*; Ide, Shunsuke; Takase, Yuichi*; Tobita, Kenji; Fukuyama, Atsushi*; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 77(10), p.1042 - 1048, 2001/10
no abstracts in English
Idomura, Yasuhiro; Tokuda, Shinji; Kishimoto, Yasuaki; Wakatani, Masahiro*
Nuclear Fusion, 41(4), p.437 - 445, 2001/04
Times Cited Count：13 Percentile：41.45(Physics, Fluids & Plasmas)no abstracts in English
Toi, Kazuo*; Fukuda, Takeshi; Wakatani, Masahiro*; Ogawa, Yuichi*; Takizuka, Tomonori; Miura, Yukitoshi; Ide, Shunsuke; Takase, Yuichi*; Tobita, Kenji; Fukuyama, Atsushi*; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 77(2), p.184 - 191, 2001/02
no abstracts in English
Wakatani, Masahiro*; Toi, Kazuo*; Fukuda, Takeshi; Ogawa, Yuichi*; Takizuka, Tomonori; Miura, Yukitoshi; Kamada, Yutaka; Oyabu, Nobuyoshi*; Hatae, Takaki
Purazuma, Kaku Yugo Gakkai-Shi, 76(10), p.1091 - 1093, 2000/10
no abstracts in English
B zonal flow in electron temperature gradient driven turbulenceIdomura, Yasuhiro; Wakatani, Masahiro*; Tokuda, Shinji
Physics of Plasmas, 7(9), p.3551 - 3566, 2000/09
Times Cited Count：55 Percentile：83.11(Physics, Fluids & Plasmas)no abstracts in English
Ninomiya, Hiromasa; Wakatani, Masahiro*; Tamano, T.*; Yoshino, Ryuji
Purazuma, Kaku Yugo Gakkai-Shi, 76(2), p.163 - 164, 2000/02
no abstracts in English
Wakatani, Masahiro*; Fukuda, Takeshi; Toi, Kazuo*; Takizuka, Tomonori; Miura, Yukitoshi; Ogawa, Yuichi*; Kamada, Yutaka; Oyabu, Nobuyoshi*; Hatae, Takaki
Purazuma, Kaku Yugo Gakkai-Shi, 76(2), p.175 - 177, 2000/02
no abstracts in English
Wakatani, Masahiro*; Oyabu, Nobuyoshi*; Ogawa, Yuichi*; Kamada, Yutaka; Takizuka, Tomonori; Toi, Kazuo*; Hatae, Takaki; Fukuda, Takeshi; Miura, Yukitoshi
Purazuma, Kaku Yugo Gakkai-Shi, 76(1), p.21 - 40, 2000/01
no abstracts in English
Wakatani, Masahiro*; Toi, Kazuo*; Fukuda, Takeshi; Oyabu, Nobuyoshi*; Kamada, Yutaka; Hatae, Takaki; Ogawa, Yuichi*; Miura, Yukitoshi; Takizuka, Tomonori
Purazuma, Kaku Yugo Gakkai-Shi, 75(7), p.864 - 865, 1999/07
no abstracts in English
*; Tokuda, Shinji; Wakatani, Masahiro*
Purazuma, Kaku Yugo Gakkai-Shi, 75(2), p.131 - 142, 1999/02
no abstracts in English
Fukuda, Takeshi; Wakatani, Masahiro*; Toi, Kazuo*; Takizuka, Tomonori; Miura, Yukitoshi; Ogawa, Yuichi*; Takamura, Shuichi*; Oyabu, Nobuyoshi*; Hosogane, Nobuyuki; Sengoku, Seio; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 74(8), p.885 - 887, 1998/08
no abstracts in English
