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Fujii, Tsuneyuki; Kasugai, Atsushi; JT-60 Team
Proceedings of 20th IEEE/NPSS Symposium on Fusion Engineering (SOFE 2003), p.222 - 227, 2003/10
The key factors to realize highly integrated performance plasma performances are control of profiles of current, pressure, rotation and so on. Therefore, several types of heating and current drive systems, ECH, LH, ICH, negative and positive ion based NBI systems, have been introduced into JT-60U. The ECH system with output power 4MW at 110 GHz has been developed using four 1 MW gyrotrons. The gyrotron has achieved 1MW-5sec output of the designed value by suppressing the parasitic oscillation with SiC RF absorber built-in. This gyrotron may get higher output power because it can adjust the anode voltage and extend the range of oscillation parameters. The NBI system has been attained 5.8 MW at 400 kV of beam energy with the negative ion based one and 28 MW with the positive ion based one. In a development work of the negative ion based NBI system, a detailed study on beamlet steering for multi-beam focusing was done, including of the space charge effects among beamlets. Then, 2.6 MW for 10s has been achieved.
Kaneko, Osamu*; Yamamoto, Takumi; Akiba, Masato; Hanada, Masaya; Ikeda, Katsunori*; Inoue, Takashi; Nagaoka, Kenichi*; Oka, Yoshihide*; Osakabe, Masaki*; Takeiri, Yasuhiko*; et al.
Fusion Science and Technology, 44(2), p.503 - 507, 2003/09
Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)High energy negative-ion-based neutral beam injection (N-NBI) is expected as an efficient and reliable tool of heating and current driving for reactor plasmas such as ITER. A world wide activity on developing technology of negative ion production and beam formation started in 1980's and the great progress has been achieved up to now. In particular, Japan has two large projects that planned adopting N-NBI for real plasma experiments; the JT-60U tokamak and the LHD heliotron, which further motivated the R&D activity. These R&D programs were carried out at JAERI and NIFS separately in Japan, and both were successfully done. The first beam injection experiment was made on the JT-60U in 1996, followed by the LHD in 1998. They were the first experiments on heating plasma by high energy beam in tokamaks and in stellerators, and the obtained results were very promising.
Ide, Shunsuke; Fujita, Takaaki; Suzuki, Takahiro; Hatae, Takaki; Naito, Osamu; Kamada, Yutaka; Seki, Masami
Plasma Physics and Controlled Fusion, 44(11), p.L63 - L69, 2002/11
Times Cited Count：25 Percentile：66.13(Physics, Fluids & Plasmas)Non-inductive full current drive (CD) in a reversed magnetic shear plasma (RS) with high energy confinement of 1.4 times the H-mode scaling at 82% of the Greenwald density has been achieved simultaneously for the first time in a tokamak; these results were obtained in the JT-60U tokamak. The full-CD state was realized by a combination of waves in the lower hybrid range of frequency and neutral beam injection together with high bootstrap current fraction (
) of 62% to the total plasma current. The combination has demonstrated for the first time active current profile modification in a high RS plasma both in the core and in peripheral regions.
Ushigusa, Kenkichi; Ide, Shunsuke; Oikawa, Toshihiro; Suzuki, Takahiro; Kamada, Yutaka; Fujita, Takaaki; Ikeda, Yoshitaka; Naito, Osamu; Matsuoka, Mamoru*; Kondoh, Takashi; et al.
Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.255 - 277, 2002/09
Times Cited Count：10 Percentile：15.15(Nuclear Science & Technology)Studies on non-inductive current drive and development of an integrated steady-state high performance operation in JT-60 are reviewed. Experiments on lower hybrid current drive in JT-60 haven shown a large non-inductive current up to 3.5MA, high current drive efficiency of 3.6x1019m-2A/W. Basic studies on LH waves in JT-60 have contributed to understand current drive physics. Significant progress in neutral beam current drive has been made in JT-60 by testing the performance of negative ion based NBI (N-NBI). The CD efficiency of ~1.5x1019m-2A /W, and N-NB driven current of ~1MA have been demonstrated in N-NBCD. Strongly localized driven current by electron cyclotron current drive was identified with a fundamental O-mode scheme. Efficiency of 0.5x1019m-2A/W and EC driven current of 0.2MA were achieved and suppression of neo-classical tearing mode was demonstrated. Based on these developments, two integrated steady-state operation scenarios were developed in JT-60, which are reversed magnetic shear (R/S) plasmas and high bp ELMy H-mode. In these operation regimes, discharges have been sustained near the steady-state current profile under full non-inductive current drive. High performance plasmas with a high nDotETio and at high normalized density were also produced under fully non-inductive condition in high bp ELMy H-mode and R/S mode.
Ide, Shunsuke; JT-60 Team
Journal of Plasma and Fusion Research SERIES, Vol.4, p.99 - 105, 2001/00
no abstracts in English
Fukuyama, Atsushi*; Takase, Yuichi*; Ide, Shunsuke; Ushigusa, Kenkichi
Purazuma, Kaku Yugo Gakkai-Shi, 76(2), p.127 - 137, 2000/02
no abstracts in English
ITER Physics Expert Group on Energetic Particles, Heating and Current Drive
Nuclear Fusion, 39(12), p.2495 - 2539, 1999/00
no abstracts in English
Ohara, Yoshihiro
Purazuma, Kaku Yugo Gakkai-Shi, 72(5), p.393 - 402, 1996/00
no abstracts in English
Matsuoka, Mamoru; JT-60 Team
Fusion Engineering and Design, 26(1-4), p.59 - 68, 1995/01
Times Cited Count：2 Percentile：28.04(Nuclear Science & Technology)no abstracts in English
Nemoto, Masahiro; Ushigusa, Kenkichi; Imai, Tsuyoshi; Ikeda, Yoshitaka; Naito, Osamu; Kusama, Yoshinori; Tobita, Kenji; Takeuchi, Hiroshi; JT-60 Team
Physical Review Letters, 67(1), p.70 - 73, 1991/07
Times Cited Count：14 Percentile：70.05(Physics, Multidisciplinary)no abstracts in English
Imai, Tsuyoshi; Ushigusa, Kenkichi; Ikeda, Yoshitaka; Naito, Osamu; Yoshida, Hidetoshi; Seki, Masami; Nemoto, Masahiro; Sato, Masayasu; Koide, Yoshihiko; Uehara, Kazuya; et al.
Kaku Yugo Kenkyu, 65(SPECIAL ISSUE), p.119 - 132, 1991/03
no abstracts in English
Shimada, Michiya; Suzuki, Norio; Nakamura, Hiroo; Tsuji, Shunji
Kaku Yugo Kenkyu, 65(SPECIAL ISSUE), p.185 - 200, 1991/03
no abstracts in English
Imai, Tsuyoshi; Ushigusa, Kenkichi; Ikeda, Yoshitaka; Nemoto, Masahiro; Kusama, Yoshinori; Matsuoka, Mamoru; JT-60 Team
Nuclear Fusion, 30(1), p.161 - 168, 1990/01
Times Cited Count：11 Percentile：48.1(Physics, Fluids & Plasmas)no abstracts in English
JT-60 Team
JAERI-M 87-009, 348 Pages, 1987/03
no abstracts in English
; ; ; ; ; ; ; JT-60 Team
JAERI-M 87-012, 21 Pages, 1987/02
no abstracts in English
; Araki, Masanori; ; ; ; ; ; Matsuda, Shinzaburo; ; *; et al.
JAERI-M 82-045, 13 Pages, 1982/05
no abstracts in English
