The design, experiment investigation, and experience of 324 MHz/3 MW klystron power source system for CSNS Linac

There are five sets of pulse type 324 MHz triode klystron power sources in the China Spallation Neutron Source (CSNS) Linac Radio Frequency (RF) system that provide high frequency power for the RFQ accelerator and four Drift Tube Linac (DTL) accelerators, respectively. They have a high frequency pulse width of 650 μs and a pulse repetition frequency of 25 Hz. Each klystron power source consists of a DC high voltage power supply, a crowbar, a solid-state modulator, and a 324 MHz klystron. At present, these five klystron power sources operate stably, which ensures the long-term stable operation of CSNS Linac. The development of each component of the klystron power source system is introduced in detail in this paper, and the specific problems and solutions are elaborated during the commissioning and operation of 324 MHz klystron power sources.