• M. Kawamura, Y. Fukui, F. Naito
  KEK, Ibaraki
• E. Chishiro, H. Suzuki, M. Yamazaki
  JAEA, Ibaraki-ken
• K. Hasegawa, S. Shinozaki
  JAEA/J-PARC, Tokai-mura

This report will describe the present status of the power supply systems (PS systems) for the klystrons in the J-PARC (Japan Proton Accelerator Research Complex) linac. The technical specification, the operating experience, and the upgrade plan, of the PS systems will be presented in this report. Now the energy of the J-PARC linac is 181MeV, and the linac includes twenty 324MHz klystrons. In 2012, the energy will be upgraded to 400MeV, and the linac will include twenty 324MHz klystrons and twenty-five 972MHz klystrons. The klystrons are the modulating-anode types. The PS systems include the High voltage DC power supplies (DCPSs) and the anode-modulators. One DCPS drives one or four klystrons, and one anode-modulator drives one klystron.