THE INSTALLATION AND COMMISSIONING OF THE HELIUM CRYOGENIC SYSTEM FOR THE TPS PROJECT

The construction of an electron accelerator with energy 3 GeV for a highly brilliant and high-flux X-ray photon source is under way at NSRRC. There will be eventually four superconducting radio-frequency (SRF) cavities installed at the storage ring to maintain the electron energy. The helium cryogenic system has been designed and fabricated to provide the required liquid helium for the SRF cavities. The cryogenic system consists of a 700W refrigerator and liquefier, a 315-kW variable-frequency compressor, an oil removal system, a recovery compressor system, gaseous-helium buffer tanks, and one 7000-L liquid helium dewar. The installation and commissioning of the overall system are presented and discussed in this paper.