Operational experience of the superconducting RF module at TLS

An industrially manufactured CESR-type SRF module has been routinely operated at the Taiwan Light Source (TLS) at the National Synchrotron Radiation Research Center (NSRRC) since the beginning of March 2005. The original goals of doubling the electron beam current to increase the synchrotron light intensity and of eliminating the instability caused by the interaction of the electron beams with the cavity’s higher-order modes have been successfully demonstrated. The greatest challenge to the operational reliability, the short mean time between failures, has been successfully overcome. This work reports the operational experience and status of the SRF module at TLS, toward a maximum beam current of 400 mA in decay mode, of 300 mA in top-up mode and of 200 mA in routine operation, over last six months.