Development of dc -1 MV power supply and negative ion beam accelerator for ITER

Watanabe, Kazuhiro; Yamamoto, Masanori; Taniguchi, Masaki; Umeda, Naotaka; Kobayashi, Kaoru; Hanada, Masaya; Kashiwagi, Mieko; Tobari, Hiroyuki; Dairaku, Masayuki; Sakamoto, Keishi; Inoue, Takashi; Yamashita, Yasuo*

Japan Atomic Energy Agency as a Japanese Domestic Agency will procure the high voltage part of the power supply for the ITER neutral beam injector (NBI). Design studies have been performed on high voltage components and a surge suppression system of the -1 MV power supply. It was confirmed by circuit analysis that an input energy from the power supply to the accelerator can be reduced to 20 joule which is smaller than the design criteria of 50 joule at 1 MV breakdowns. Present status of the development on the negative ion accelerators and high voltage bushing will be also reported.