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Fujita, Takaaki; JT-60 Team
Nuclear Fusion, 46(3), p.S3 - S12, 2006/03
Times Cited Count：8 Percentile：28.05(Physics, Fluids & Plasmas)no abstracts in English
Ushigome, Masahiro*; Ide, Shunsuke; Ito, Satoshi*; Jotaki, Eriko*; Mitarai, Osamu*; Shiraiwa, Shunichi*; Suzuki, Takahiro; Takase, Yuichi*; Tanaka, Shigetoshi*; Fujita, Takaaki; et al.
Nuclear Fusion, 46(2), p.207 - 213, 2006/02
Times Cited Count：11 Percentile：37.01(Physics, Fluids & Plasmas)This papaer studies on tokamak plasma start-up completely without central solenoid (CS). On the JT-60 tokamak it is demonstrated that a completely CS-less Ip start-up to 100 kA was achieved even without any null-point by Electron cyclotron range of frequencies (ECRF) and outer PF coil current swing only. Necessary conditions (the EC power, the toroidal field etc.) were clarified. Moreover, it was succeded to maintain Ip = 260kA for 1 sec without CS by NB only. In addition Ip ramp-up by EC and NB only (without LHCD) from 215 to 310kA was achieved. In a high confinement reversed shear discharge, a result suggesting bootstrap over drive was obtained.
Sakamoto, Yoshiteru; JT-60 Team
Plasma Physics and Controlled Fusion, 47(12B), p.B337 - B348, 2005/12
Times Cited Count：3 Percentile：10.45(Physics, Fluids & Plasmas)no abstracts in English
Sakamoto, Yoshiteru; Fujita, Takaaki; Ide, Shunsuke; Isayama, Akihiko; Takechi, Manabu; Suzuki, Takahiro; Takenaga, Hidenobu; Oyama, Naoyuki; Kamada, Yutaka; JT-60 Team
Nuclear Fusion, 45(7), p.574 - 580, 2005/07
Times Cited Count：43 Percentile：76.9(Physics, Fluids & Plasmas)This paper reports results on the progress in stationary discharges with a large bootstrap current fraction in JT-60U towards steady-state tokamak operation. In weak shear plasma regime, high-_p ELMy H-mode discharges have been optimized under nearly full non-inductive current drive by the large bootstrap current fraction (fBS
50%) and the beam driven current fraction (fBD
40%), which was sustained for 2.3s with stationary condition. The high confinement enhancement factor H892.3 (HH98y21.0) was also sustained under the condition of TeTi. In reversed shear plasma regime, the large bootstrap current fraction (fBS75%) has been sustained for 7.4 s under nearly full non-inductive current drive condition. The high confinement enhancement factor H893.0 (HH98y21.7) was also sustained, and the profiles of current and pressure approached the stationary condition. The large bootstrap current and the off-axis beam driven current sustained this reversed q-profile. This duration was limited only by the duration of the neutral beam injection.
Kikuchi, Mitsuru; Suzuki, Takahiro; Sakamoto, Yoshiteru; Fujita, Takaaki; Naito, Osamu; JT-60 Team
Europhysics Conference Abstracts (CD-ROM), 29C, 4 Pages, 2005/00
Until 1995, it is experimentally confirmed that parallel transport of tokamak follows prediction of neoclassical theory (Kikuchi, Azumi, PPCF review). But it relies on gloval parameter. Since then, local measurement of bootstrap current density or electrical conductivity becomes possible by the development of new plasma diagnostics technique. In this paper, method of comparison of current profile evaluation and its application to electrical conductivity and bootstrap current density is reported.
Ishida, Shinichi; JT-60 Team; JFT-2M Group
Physics of Plasmas, 11(5), p.2532 - 2542, 2004/05
Times Cited Count：22 Percentile：57.92(Physics, Fluids & Plasmas)no abstracts in English
Suzuki, Takahiro; Oikawa, Toshihiro; Isayama, Akihiko; Fujita, Takaaki
Purazuma, Kaku Yugo Gakkai-Shi, 80(5), p.362 - 363, 2004/05
An analytical method to evaluate spatio-temporal change in current density profile directly from the motional Stark effect (MSE) diagnostic is applied to a discharge, where a neo-classical tearing mode (NTM) appeared and was stabilized by electron cyclotron current drive (ECCD). The analysis clearly shows spatially localized decrease in current density at the magnetic island location, implying decrease in bootstrap current due to flattening of pressure profile within the island. When the NTM is stabilized after the start of the ECCD application, increase in current density at the island location is observed.
Sakurai, Shinji; JT-60 Team
Plasma Science and Technology, 6(1), p.2151 - 2158, 2004/02
Times Cited Count：0 Percentile：0.02(Physics, Fluids & Plasmas)no abstracts in English
Shiraiwa, Shunichi*; Ide, Shunsuke; Ito, Satoshi*; Mitarai, Osamu*; Naito, Osamu; Ozeki, Takahisa; Sakamoto, Yoshiteru; Suzuki, Takahiro; Takase, Yuichi*; Tanaka, Shigetoshi*; et al.
Physical Review Letters, 92(3), p.035001_1 - 035001_4, 2004/01
Times Cited Count：48 Percentile：82.94(Physics, Multidisciplinary)no abstracts in English
reversed shear plasmasTakei, Nahoko; Nakamura, Yukiharu; Kawano, Yasunori; Tsutsui, Hiroaki*; Ozeki, Takahisa; Tobita, Kenji; Sugihara, Masayoshi; Iio, Shunji*; Shimada, Ryuichi*; Jardin, S. C.*
Europhysics Conference Abstracts, 28G, 4 Pages, 2004/00
no abstracts in English
Takei, Nahoko; Nakamura, Yukiharu; Kawano, Yasunori; Tsutsui, Hiroaki*; Ozeki, Takahisa; Tobita, Kenji; Sugihara, Masayoshi; Iio, Shunji*; Shimada, Ryuichi*; Jardin, S. C.*
Journal of Plasma and Fusion Research SERIES, Vol.6, p.554 - 557, 2004/00
no abstracts in English
Nakamura, Yukiharu; Tsutsui, Hiroaki*; Takei, Nahoko*; Shirai, Hiroshi; Sugihara, Masayoshi; Gribov, Y.*; Ozeki, Takahisa; Tobita, Kenji; Iio, Shunji*; Jardin, S. C.*
Journal of Plasma and Fusion Research SERIES, Vol.6, p.196 - 198, 2004/00
no abstracts in English
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
Nakamura, Yukiharu; Tsutsui, Hiroaki*; Takei, Nahoko*; Sakamoto, Yoshiteru; Fujita, Takaaki; Sugihara, Masayoshi; Ozeki, Takahisa; Tobita, Kenji; Konishi, Satoshi; Iio, Shunji*; et al.
Europhysics Conference Abstracts, 27A, 4 Pages, 2003/00
no abstracts in English
Kishimoto, Hiroshi; Shirai, Hiroshi
Proceedings of 3rd International Sakharov Conference on Physics, p.185 - 200, 2003/00
no abstracts in English
Fukuda, Takeshi; JT-60 Team
Plasma Physics and Controlled Fusion, 44(12B), p.B39 - B52, 2002/12
Times Cited Count：7 Percentile：24.31(Physics, Fluids & Plasmas)no abstracts in English
Fujita, Takaaki
Plasma Physics and Controlled Fusion, 44(5A), p.A19 - A35, 2002/05
Times Cited Count：28 Percentile：63.95(Physics, Fluids & Plasmas)no abstracts in English
Fujita, Takaaki; Kamada, Yutaka; Ide, Shunsuke; Takeji, Satoru; Sakamoto, Yoshiteru; Isayama, Akihiko; Suzuki, Takahiro; Oikawa, Toshihiro; Fukuda, Takeshi; JT-60 Team
Nuclear Fusion, 42(2), p.180 - 186, 2002/02
Times Cited Count：31 Percentile：68.29(Physics, Fluids & Plasmas)no abstracts in English
Miura, Yukitoshi; Fujita, Takaaki; Oikawa, Toshihiro; Suzuki, Takahiro; Ide, Shunsuke; Sakamoto, Yoshiteru; Koide, Yoshihiko; Hatae, Takaki; Naito, Osamu; Isayama, Akihiko; et al.
IAEA-CN-94/EX/C3-1Ra (CD-ROM), 5 Pages, 2002/00
no abstracts in English
Fujita, Takaaki; Miura, Yukitoshi; Suzuki, Takahiro; Ide, Shunsuke; Takenaga, Hidenobu; Oikawa, Toshihiro; Chankin, A. V.; Sakamoto, Yoshiteru; Koide, Yoshihiko; Hatae, Takaki; et al.
Proceedings of 29th European Physical Society Conference on Plasma Physics and Controlled Fusion, 9 Pages, 2002/00
no abstracts in English
