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-ion beams for ITER neutral beam systemTaniguchi, Masaki; Inoue, Takashi; Kashiwagi, Mieko; Watanabe, Kazuhiro; Hanada, Masaya; Seki, Takayoshi*; Dairaku, Masayuki; Sakamoto, Keishi
Review of Scientific Instruments, 77(3), p.03A514_1 - 03A514_4, 2006/03
Times Cited Count：15 Percentile：56.64(Instruments & Instrumentation)In the ITER NB systems, conventional gas insulation technology cannot be utilized because of the conductivity of the insulation gas caused by the radiation from the tokamak plasma. To overcome this problem, a vacuum insulated beam source (VIBS), where the whole beam source is immersed in vacuum, has been developed in JAERI. Recently, voltage holding capability of the VIBS was drastically improved by installing the large stress ring and these progress enables us to perform the high power operation of the VIBS accelerator. For high current density H- beam acceleration, modifications were made on KAMABOKO source. At present, H- beam current density is 146 A/m
at 836 keV (input arc power; 40 kW, operation pressure; 0.3 Pa).The acceleration of 900 keV, 0.1 A level beam was accomplished for 175 shots during the test campaign. The beam acceleration was quite stable and the degradation of the voltage holding due to the beam acceleration and/or Cs seeding was not observed.
Inoue, Takashi; Hanada, Masaya; Iga, Takashi*; Imai, Tsuyoshi; Kashiwagi, Mieko; Kawai, Mikito; Morishita, Takatoshi; Taniguchi, Masaki; Umeda, Naotaka; Watanabe, Kazuhiro; et al.
Fusion Engineering and Design, 66-68, p.597 - 602, 2003/09
Times Cited Count：21 Percentile：78.43(Nuclear Science & Technology)The neutral beam (NB) injection has been one of the most promising methods for plasma heating and current drive in tokamak fusion devices. JAERI has developed high energy electrostatic accelerators for the NB systems in JT-60U and ITER. Recent progress on this R&D are as follows: 1) In the JT-60U NB system, some of the beams has been deflected due to distorted electric field in the accelerator, resulting in an excess heat load on the NB port. By correcting the electric field, a continuous injection of H
beam was succeeded for 10 s with the NB power of 2.6 MW at 355 keV. 2) To increase the beam energy, a metal structure called stress ring was designed. The ring reduces electric field concentration at the triple junction point (interface between metal and dielectric insulator inside vacuum). Initial test of the accelerators with the stress rings has shown higher voltage hold off performance in both accelerators for JT-60U and ITER R&D than that without rings.
Hirao, Toshio; Laird, J. S.; Mori, Hidenobu; Onoda, Shinobu; Wakasa, Takeshi; Yamakawa, Takeshi; Abe, Hiroshi; Ito, Hisayoshi
Proceedings of 5th International Workshop on Radiation Effects on Semiconductor Devices for Space Applications, p.161 - 166, 2002/10
no abstracts in English
Inoue, Takashi; Hemsworth, R. S.*; Kulygin, V.*; Okumura, Yoshikazu
Fusion Engineering and Design, 55(2-3), p.291 - 301, 2001/07
Times Cited Count：25 Percentile：84.31(Nuclear Science & Technology)no abstracts in English
Sugimoto, Masayoshi
Proc. of 2nd Int. Topical Meeting on Nuclear Applications of Accelerator Technology (AccApp'98), p.566 - 571, 1998/00
no abstracts in English
Miyamoto, Naoki*; ; Okumura, Yoshikazu; Inoue, Takashi; Fujiwara, Yukio; Miyamoto, Kenji; Nagase, Akihito*; Ohara, Yoshihiro; Watanabe, Kazuhiro
AIP Conference Proceedings 380, p.300 - 308, 1996/00
no abstracts in English
Kondoh, Takashi; JT-60 Team
Physics of Plasmas, 1(5), p.1489 - 1496, 1994/05
Times Cited Count：19 Percentile：57.2(Physics, Fluids & Plasmas)no abstracts in English
ion source for negative-ion-based neutral beam injectorOkumura, Yoshikazu; Fumelli, M.*; Hanada, Masaya; Jequier, F.*; Pamela, J.*; Watanabe, Kazuhiro
Fusion Technology 1992, Vol.1, p.594 - 598, 1994/00
no abstracts in English
Okumura, Yoshikazu
Nihon Genshiryoku Gakkai-Shi, 35(12), p.1049 - 1056, 1993/12
Times Cited Count：0 Percentile：0.51(Nuclear Science & Technology)no abstracts in English
Watanabe, Kazuhiro; Hanada, Masaya; Inoue, Takashi; *; Mizuno, Makoto; Ohara, Yoshihiro; Okumura, Yoshikazu; Suzuki, Yasuo*; Tanaka, Hideki*; Tanaka, Masanobu*
Proc. of 14th Int. Conf. on Plasma Physics and Controlled Nuclear Fusion Research, p.371 - 378, 1993/00
no abstracts in English
/D ion sourceOkumura, Yoshikazu
Proc. of the 1st Meeting on the Ion Engineering Society of Japan, p.23 - 30, 1992/00
no abstracts in English
