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Report No.
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Development of 1 MeV accelerator for the procurement of ITER NBI

Inoue, Takashi; Dairaku, Masayuki; Kashiwagi, Mieko; Mizuno, Takatoshi; Taniguchi, Masaki; Tobari, Hiroyuki; Umeda, Naotaka; Watanabe, Kazuhiro; Yamanaka, Haruhiko

Multiaperture multigrid accelerators and a HV bushing that connects power supply and the accelerator have been developed at JAEA for the ITER neutral beam injector (NBI). So far, the accelerator held dc 1 MV high voltage at operation pressure range of 0.1 Pa by lowering electric stress at cathode triple junction. Recently many discharge traces were found from small gaps, steps, corners, edges and even on screw heads suggesting discharges initiated from such local concentration of electric stresses. In order to mitigate the local stress gap between the accelerator grids were expanded from original 72 - 90 m to 100 mm. This was effective to improve the voltage holding even without hydrogen gas, and as the consequence, 360 mA H$$^{-}$$ ions were accelerated up to 879 keV, which updated previous record of 796 keV, 320 mA.

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