Operation Experiences of the SRRC 1.3 GeV Electron Storage Ring Vacuum System

system was made of aluminum alloys. This system has the features of oil-free pumping configuration and low dust contaminated environmental installation. The system has been operated for nearly one year. The photon induced desorption (PID) phenomenon was observed clearly and the desorption coefficient of PID was reduced by more than three orders of magnitude after an accumulated beam dose of ‘;> 140 Ah. The operation experiences of the SRRC vacuum system will be described. 1. INTR~DKTI~N In the SRRC 1 3 GeV electron storage ring, a third generation synchrotron light source, design of the high brightness and low emittance synchrotron radiation from both the insertion devices and the bending magnets were considered.[l] The vacuum system is divided into tw