Reduction in the fault rate of high voltage power supply for klystrons by using Veto circuit in the J-PARC Linac

Hori, Toshihiko; Shinozaki, Shinichi ; Sato, Fumiaki; Fukui, Yuji*; Futatsukawa, Kenta*

We are making efforts to decrease the fault rate of the high voltage power supplies for 324 MHz klystron. A new Veto module has been developed to prevent the 25 Hz trigger fan out module from malfunction due to the klystron discharge. As the result of installing the Veto module to the SDTL#16 klystron station, the klystron had never stopped for two months operation although the discharge occurred forty-two times during the operation. It confirmed that the installation of the Veto module is extremely useful to operate the klystron stably.