Semiconductor pulse power supplies for accelerators at J-PARC

Takayanagi, Tomohiro   ; Ono, Ayato; Fuwa, Yasuhiro   ; Shinozaki, Shinichi ; Horino, Koki*; Ueno, Tomoaki*; Sugita, Moe ; Yamamoto, Kazami   ; Oguri, Hidetomo  ; Kinsho, Michikazu  ; Oda, Kodai*; Kamezaki, Hiroaki*; Ikoma, Naoya*; Nakata, Kyosuke*; Mushibe, Yoichi*; Tokuchi, Akira*

At J-PARC, semiconductor short pulse power supplies to replace kicker power supplies and semiconductor long pulse power supplies to replace klystron power supply systems are under construction. We have fabricated a 40kV/2kA/1.2s unit power supply that employs a linear transformer drivers (LTD) system for kickers. Currently, we are working on a high voltage insulating cylinder insulator that suppresses corona discharges using only the insulator structure, without using insulating oil. In addition, the MARX system was adopted for klystron power supply system. A main circuit unit for 8kV/60A/830s rectangular pulse output and an 800V/60A correction circuit unit that improves the flat top droop from 10% to 1% were manufactured. Furthermore, a 2.2kV/2.4kW high voltage SiC inverter charger has been fabricated for this MARX power supply. The presentation will report the evaluation results of each test and prospects for semiconductor pulse power supplies.