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Kashiwagi, Mieko; Umeda, Naotaka; Kojima, Atsushi; Yoshida, Masafumi; Tobari, Hiroyuki; Dairaku, Masayuki; Yamanaka, Haruhiko; Maejima, Tetsuya; Yamashita, Yasuo*; Shibata, Naoki; et al.
Fusion Engineering and Design, 96-97, p.107 - 112, 2015/10
Times Cited Count：5 Percentile：34.81(Nuclear Science & Technology)JAEA proceeds the R&Ds of high voltage components, such as 1MeV accelerator and high voltage power supply for the ITER neutral beam injector for heating (ITER HNB). In the 1MeV accelerator R&D, the target is to produce 1MeV beams during several tens of seconds using a five-stage multi-aperture accelerator. In the extraction grid, cooling capability is enhanced to accept electrons during long period and aperture offset is applied to correct the beam deflection due to magnetic fields in the accelerator. As the result, the heat load on the acceleration grids was reduced from 23% to 13%. The beam energy was increased from 0.9MeV to 1MeV at short pulse of 0.4s. The beam pulse was increased by a factor of one hundred, 60s, at 0.7MeV up to now. In the R&D of the power supply, a 1MV bushing of 1MV insulating transformer has been newly developed and a stable operation at 1.2MV with the margin of 20% was achieved for 3600s. Thus, the R&Ds for the ITER HNB is progressed as scheduled.
Watanabe, Kazuhiro; Kashiwagi, Mieko; Kawashima, Shuichi*; Ono, Yoichi*; Yamashita, Yasuo*; Yamazaki, Choji*; Hanada, Masaya; Inoue, Takashi; Taniguchi, Masaki; Okumura, Yoshikazu; et al.
Nuclear Fusion, 46(6), p.S332 - S339, 2006/06
Times Cited Count：36 Percentile：73.21(Physics, Fluids & Plasmas)no abstracts in English
Kashiwagi, Mieko; Watanabe, Kazuhiro; Yamanaka, Haruhiko; Maejima, Tetsuya; Terunuma, Yuto*; Oda, Yuki; Tobari, Hiroyuki; Dairaku, Masayuki; Hanada, Masaya
no journal, ,
Toward the neutral beam (NB) system of ITER, the prototype of the ITER NB is under construction in the NB test facility (NBTF), Padova, Italy. For the NBTF, Japan Atomic Energy Agency manufactures, transports and constructs the 1MV high voltage power supply components to generate 1 MV, 60 A for 3600 s, which consist of fourteen components such as five DC generators and transmission lines with 100 m in a length. The manufacturing of the power supply components is in progress as scheduled. Three of five DCGs and 80% of the transmission lines have been completed. In the factory, the voltage holding test including the margin of 20% were successfully demonstrated. Then, these are under transportation to the NBTF. The construction work is started from Dec/2015 as scheduled. As the one of R&Ds results, the development of the water choke made of fiber reinforced plastic (FRP) is reported, which is the alternative of the conventional ceramic.
