The RF system for the Beijing Electron Positron Collider Upgrade(BEPCⅡ)Project had been working since Nov,2006.It consists of 3 subsystems including the superconducting cavity,the klystron and the low level RF system.Compared with the former RF system,the operating frequency has been changed from 200MHz to 499.8MHz, and the superconducting cavity has been used to replace the normal cavity.Up to now,the RF system performance is good and achieves the designed target.
The BEPC RF system has been changed to superconducting cavities during the last four years.In the Summer of 2006,the high power test had been successfully carried.In November,the East RF was put into commis- sioning.The SRF system above 1.0MV voltage has been reached with the e^+/e^- collision beam over 100mA,and the beam current improved to 2.5GeV/250mA with 100kW beam power.The beam test shows the good matching of the RF parameters with measuring value and theoretic calculation.The commissioning and the high power test will be presented in this paper.
