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Akino, Noboru; Endo, Yasuei; Hanada, Masaya; Kawai, Mikito*; Kazawa, Minoru; Kikuchi, Katsumi*; Kojima, Atsushi; Komata, Masao; Mogaki, Kazuhiko; Nemoto, Shuji; et al.
JAEA-Technology 2014-042, 73 Pages, 2015/02
JAEA-Technology-2014-042.pdf:15.1MB
According to the project plan of JT-60 Super Advanced that is implemented as an international project between Japan and Europe, the neutral beam (NB) injectors have been disassembled. The disassembly of the NB injectors started in November, 2009 and finished in January, 2012 without any serious problems as scheduled. This reports the disassembly activities of the NB injectors.
Oikawa, Toshihiro
JAERI-Research 2003-028, 134 Pages, 2004/01
JAERI-Research-2003-028.pdf:7.73MB
The negative ion based neutral beam (N-NB) driven current density was determined over a wide range of electron temperatures. Theoretical prediction of the NB current drive increasing with beam energy and electron temperature was validated. A record value of NB current drive efficiency was achieved simultaneously with high confinement and high beta at a plasma current of 1.5 MA under a full current drive condition. The experimental validation of NB current drive theory gives greater confidence in predicting the NB current drive in future reactors. However, it was also found that MHD instabilities caused a degradation of NB current drive. A beam-driven instability expelled N-NB fast ions carrying non-inductive current from the central region. The lost N-NB driven current was estimated to be 7 % of the total N-NB driven current. For the neoclassical tearing mode (NTM), comparisons of the measurements with transport code calculations revealed that the loss of fast ions increases with the NTM activity and that fast ions at higher energies suffer larger transport than at lower energies.
Yamamoto, Takumi; JT-60 Team
Fusion Engineering and Design, 66-68, p.39 - 48, 2003/09
Times Cited Count：3 Percentile：25.79(Nuclear Science & Technology)Development of technology on facilities for JT-60U and resultant progress of the plasma performance are reported. The main objectives of JT-60U are to demonstrate integrated high plasma performance that contributes to establishment of the physical and technological bases of ITER and a steady state tokamak fusion reactor. Recently, performance exploration in advanced tokamak regimes has been conducted intensively, by using 500 keV negative-ion based neutral beam injection (N-NBI) and 110GHz electron cyclotron (EC) systems for plasma heating and current drive, and a repetitive centrifugal pellet injector for efficient core particle fueling.
Kawai, Mikito; Akino, Noboru; Ebisawa, Noboru; Grisham, L. R.*; Hanada, Masaya; Honda, Atsushi; Inoue, Takashi; Kazawa, Minoru; Kikuchi, Katsumi*; Kuriyama, Masaaki; et al.
Fusion Science and Technology, 44(2), p.508 - 512, 2003/09
Times Cited Count：5 Percentile：36.81(Nuclear Science & Technology)The negative ion source for negative ion based neutral beam injector(N-NBI) of JT-60U aims at generating a negative ion beam with 500 keV and 22A for 10s. The N-NBI system was completed in 1996, followed by starting the efforts to increase beam power and energy. (1)Spatial non-uniformity of the source plasma causes position-dependent divergence of a beamlet due to mis-matching of local beam perveance. A part of the divergent energetic beams is intercepted by the grids and resultantly produce the excessive heat load of the grids and/or induce the high voltage breakdown. So several techniques to take measures against and to correct the non-uniformity in these sources were implemented. (2)Correction of beamlet deflection by adjusting the electric field at the extraction grids. It improved the beam divergence and then decreased an excessive heat load of a beam limiter by more than 50 %. As a result, the maximum injection power 6.2MW and beam pulse duration 10 seconds were obtaind.
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.
Ide, Shunsuke; Suzuki, Takahiro; Sakamoto, Yoshiteru; Takenaga, Hidenobu; Koide, Yoshihiko; Fujita, Takaaki; Fukuda, Takeshi; Kamada, Yutaka; Shirai, Hiroshi; Takizuka, Tomonori
Plasma Physics and Controlled Fusion, 44(5A), p.A137 - A142, 2002/05
Times Cited Count：18 Percentile：50.83(Physics, Fluids & Plasmas)no abstracts in English
Kashiwagi, Mieko; Morishita, Takatoshi; Okumura, Yoshikazu; Taniguchi, Masaki; Hanada, Masaya; Watanabe, Kazuhiro; Krylov, A.*
Review of Scientific Instruments, 73(2), p.964 - 966, 2002/02
Times Cited Count：11 Percentile：53.1(Instruments & Instrumentation)no abstracts in English
Oikawa, Toshihiro; Kamada, Yutaka; Isayama, Akihiko; Fujita, Takaaki; Suzuki, Takahiro; Umeda, Naotaka; Kawai, Mikito; Kuriyama, Masaaki; Grisham, L. R.*; Ikeda, Yoshitaka; et al.
Nuclear Fusion, 41(11), p.1575 - 1583, 2001/11
Times Cited Count：45 Percentile：77.83(Physics, Fluids & Plasmas)no abstracts in English
Kashiwagi, Mieko; Okumura, Yoshikazu; Hanada, Masaya; Morishita, Takatoshi; Watanabe, Kazuhiro; Orita, Yoshitaka*; Horiike, Hiroshi*; Ido, Shuji*
JAERI-Tech 2001-046, 19 Pages, 2001/06
JAERI-Tech-2001-046.pdf:1.79MB
no abstracts in English
n eigenmodes driven by Alfnic beam ions in JT-60UShinohara, Koji; Kusama, Yoshinori; Takechi, Manabu; Morioka, Atsuhiko; Ishikawa, Masao*; Oyama, Naoyuki; Tobita, Kenji; Ozeki, Takahisa; Takeji, Satoru; Moriyama, Shinichi; et al.
Nuclear Fusion, 41(5), p.603 - 612, 2001/05
Times Cited Count：83 Percentile：90.44(Physics, Fluids & Plasmas)no abstracts in English
Ide, Shunsuke; JT-60 Team
Journal of Plasma and Fusion Research SERIES, Vol.4, p.99 - 105, 2001/00
no abstracts in English
Kramer, G. J.; Iwase, Makoto; Kusama, Yoshinori; Morioka, Atsuhiko; Nemoto, Masahiro; Nishitani, Takeo; Shinohara, Koji; Takeji, Satoru; Tobita, Kenji; Ozeki, Takahisa; et al.
Nuclear Fusion, 40(7), p.1383 - 1396, 2000/07
Times Cited Count：46 Percentile：77.78(Physics, Fluids & Plasmas)no abstracts in English
Kawai, Mikito; Grisham, L. R.*; Ito, Takao; Kazawa, Minoru; Kuriyama, Masaaki; Mogaki, Kazuhiko; Okumura, Yoshikazu; Watanabe, Kazuhiro
Review of Scientific Instruments, 71(2), p.755 - 757, 2000/02
Times Cited Count：10 Percentile：55.17(Instruments & Instrumentation)no abstracts in English
Ishida, Shinichi; JT-60 Team
Nuclear Fusion, 39(9Y), p.1211 - 1226, 1999/09
Times Cited Count：40 Percentile：75.12(Physics, Fluids & Plasmas)no abstracts in English
*; Ito, Takao; Usui, Katsutomi; Mogaki, Kazuhiko; Kuriyama, Masaaki; Sato, Fujio*; Oshima, Katsumi*; Omori, Kenichiro; Watanabe, Kazuhiro
JAERI-Tech 99-054, 49 Pages, 1999/07
no abstracts in English
Kusama, Yoshinori; Fu, G. Y.*; Kramer, G. J.*; Saigusa, Mikio*; Oikawa, Toshihiro; Ozeki, Takahisa; Moriyama, Shinichi; Tchernychev, F. V.*; Nemoto, Masahiro; Kondoh, Takashi; et al.
Plasma Physics and Controlled Fusion, 41(9), p.1167 - 1177, 1999/00
Times Cited Count：5 Percentile：20.12(Physics, Fluids & Plasmas)no abstracts in English
Ushigusa, Kenkichi
Purazuma, Kaku Yugo Gakkai-Shi, 74(2), p.117 - 125, 1998/02
no abstracts in English
Naito, Osamu; Oikawa, Toshihiro; Ushigusa, Kenkichi; Nemoto, Masahiro; Tobita, Kenji; Ide, Shunsuke; Kuriyama, Masaaki; Kamada, Yutaka; Kusama, Yoshinori
Proc. of 1998 ICPP & 25th EPS Conf. on Contr. Fusion and Plasma Physics, 22C, p.1182 - 1185, 1998/00
no abstracts in English
; Ushigusa, Kenkichi; Kikuchi, Mitsuru; Nagashima, Keisuke; Neyatani, Yuzuru; Miya, Naoyuki; ; Takahashi, Yoshikazu; Hayashi, Takumi; Kuriyama, Masaaki; et al.
Proceedings of 17th IEEE/NPSS Symposium Fusion Engineering (SOFE'97), 1, p.233 - 236, 1998/00
no abstracts in English
