Computational Simulation of Refrigeration Process for BEPCII Superconducting Facilities

The main challenge to build the cryogenic system for the Beijing Electron‐Positron Collider Upgrade is to accommodate the strong differences among three types of superconducting devices with regard to their structure, location, as well as the cryogenic operating requirement. Three kinds of cooling methods are applied in the overall cryogenic system, saturated liquid helium cooling for the SRF cavities, single‐phase helium cooling for the SCQ magnets, and two‐phase helium cooling for the SSM solenoid. The optimization for the BEPCII cryogenic system was carried out by using a large‐scale computational simulation package. This paper presents thermal parameters and numerical analyses for the BEPCII cryogenic system.