Low contamination ultrahigh vacuum system of the Synchrotron Radiation Research Center 1.3 GeV electron storage ring

Abstract

The vacuum system of the Synchrotron Radiation Research Center 1.3 GeV electron storage ring was designed as a low contamination ultrahigh vacuum system. In addition to the standard treatments for the ultrahigh vacuum components, several contamination reduction methods, such as oil‐free machining processes, completely oil‐free pumping systems, and dust‐controlled installation processes, were adopted in the manufacturing processes. The benefits of the low‐contamination treatments were verified by the resultant fast‐beam cleanup, low degree of dust trapping, and low partial pressures of the carbonaceous residual gases in the vacuum system.