Development of a compact high voltage pulse power supply of MARX-type for muon linac klystron

Takayanagi, Tomohiro   ; Fuwa, Yasuhiro   ; Otani, Masashi*; Shimomura, Koichiro*; Mibe, Tsutomu*; Kondo, Yasuhiro   ; Futatsukawa, Kenta*; Cicek, E.*; Nakazawa, Yuga*; Tokuchi, Akira*; Ikoma, Naoya*; Kawakami, Hiroaki*

We have been developing a compact pulse power supply with high output and high frequency specifications: output voltage of 75 kV, current of 40 A, main pulse width of 50 us, and repetition frequency of 25 Hz for short pulse waveforms. This power supply is used to drive klystron for muon linac, which requires high stability and reliability. It uses a next-generation power semiconductor SiC-MOSFET with excellent characteristics of ultra-high withstand voltage of 13 kV and low loss, which was realized through the technological development of wide band gap semiconductor devices. Combining this SiC-MOSFET with the Marx circuit that generates ultra-high voltage pulses will realize a more compact pulse power supply with lower losses than conventional ones. In addition, future ap-plications in portable accelerators are also possible. In this presentation, the circuit design of the Marx power supply will be reported.