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Journal Articles

A Review of internal transport barrier physics for steady-state operation of tokamaks

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:253 Percentile:23.26(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.

Journal Articles

Stability of ideal MHD ballooning modes and its stabilization by toroidal rotation shear near separatrix

Furukawa, Masaru; Tokuda, Shinji; Wakatani, Masahiro*

Plasma Physics and Controlled Fusion, 46(2), p.409 - 421, 2004/02

 Times Cited Count:7 Percentile:74.66(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.

Journal Articles

Objectives and design of the JT-60 superconducting tokamak

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

Journal Articles

Objectives and design of the JT-60 superconducting tokamak

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:27.44(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Geometrical improvements of rotational stabilization of high-$$n$$ ballooning modes in tokamaks

Furukawa, 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-$$n$$ 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.

Journal Articles

Geometrical improvements of rotational stabilization of high-$$n$$ ballooning modes in tokamaks

Furukawa, Masaru; Tokuda, Shinji; Wakatani, Masahiro*

Nuclear Fusion, 43(6), p.425 - 429, 2003/06

 Times Cited Count:10 Percentile:65.6(Physics, Fluids & Plasmas)

We have found numerically that damping phases appear in the time evolution of the perturbation energy of high-$$n$$ 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.

Journal Articles

Reports from Meetings of ITPA (International Tokamak Physics Activity), 4

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

Journal Articles

Report of ITPA (International Tokamak Physics Activity) Meeting, 3

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.

Journal Articles

Overview of the International Tokamak Physics Activity (ITPA)

Wakatani, Masahiro*; Takamura, Shuichi*; Ninomiya, Hiromasa

Purazuma, Kaku Yugo Gakkai-Shi, 78(1), p.72 - 73, 2002/01

no abstracts in English

Journal Articles

Recent ITER physics R&D expert group activities

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

Journal Articles

Gyrokinetic theory of drift waves in negative shear tokamaks

Idomura, Yasuhiro; Tokuda, Shinji; Kishimoto, Yasuaki; Wakatani, Masahiro*

Nuclear Fusion, 41(4), p.437 - 445, 2001/04

 Times Cited Count:13 Percentile:56.61(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Report of ITER Physics R&D Expert Group Workshop and Physics Committee Meeting

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

Journal Articles

Report on the ITER Physics R&D Expert Group Meeting

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

Journal Articles

Stability of E$$times$$B zonal flow in electron temperature gradient driven turbulence

Idomura, Yasuhiro; Wakatani, Masahiro*; Tokuda, Shinji

Physics of Plasmas, 7(9), p.3551 - 3566, 2000/09

 Times Cited Count:55 Percentile:15.03(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Results of ITER physics R&D, 8; Future prospect

Ninomiya, Hiromasa; Wakatani, Masahiro*; Tamano, T.*; Yoshino, Ryuji

Purazuma, Kaku Yugo Gakkai-Shi, 76(2), p.163 - 164, 2000/02

no abstracts in English

Journal Articles

ITER Physics R&D Expert Group report

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

Journal Articles

Results of ITER physics R&D, 2; Confinement and transport in high performance plasmas

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

Journal Articles

Report on ITER physics R&D expert group meeting

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

Journal Articles

Gyrokinetic particle simulation using the orbit average electron drift-kinetic equation

*; Tokuda, Shinji; Wakatani, Masahiro*

Purazuma, Kaku Yugo Gakkai-Shi, 75(2), p.131 - 142, 1999/02

no abstracts in English

Journal Articles

Report from ITER physics R&D expert meeting

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

23 (Records 1-20 displayed on this page)