COMMISSIONING OF BEPCII SUPERCONDUCTING RF SYSTEM

BEPC single-ring machine had been upgraded to BEPCII double-ring machine in the past four years, four 199.6MHz RT cavities were replaced by two 499.8MHz superconducting cavities. Two SRF stations of BEPCII had passed the first beam commissioning, physical problems such as changing frequency from 200MHz to 500MHz and compressing the bunch length in colliding mode, have been solved step by step. The engineering problems such as feeding 100KW beam power had also been solved. The SRF system of BEPCII project had finished on schedule. This paper gives a brief introduction to the commissioning of the SRF system of BEPCII.