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Development of semiconductor switches for high-power crowbar circuits

Ono, Ayato; Takayanagi, Tomohiro   ; Fuwa, Yasuhiro   ; Shinozaki, Shinichi ; Ueno, Tomoaki*; Horino, Koki*; Sugita, Moe ; Yamamoto, Kazami   ; Kinsho, Michikazu  ; Ikoma, Naoya*; Kamezaki, Hiroaki*; Mori, Hitoshi*; Tokuchi, Akira*

At J-PARC, an ignitron is used for the crowbar device of the klystron power supply for high-frequency acceleration of a linear accelerator. Ignitron uses mercury, which is of limited use worldwide, and is expected to be discontinued in the future. Therefore, we designed a semiconductor crowbar switch for short-circuit protection of klystron using a MOS gate thyristor. We have manufactured an oval-type board module that realizes an operating output of 3 kV, 40 kA, and 50 $$mu$$s per board. For the control power supply to each board module assuming a high voltage of 120 kV, we adopted a self-power supply method that creates a control power supply with a high-voltage DCDC converter from the voltage shared and charged by each board module. It was possible to confirm the operating performance on a 1/2 scale (60 kV, 40 kA) against the voltage of the existing equipment (120 kV, 40 kA) by connecting twenty oval board modules in series. The output test result will be reported.

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