Conceptual Design of Cryogenic System for HFRS of HIAF Project

High Intensity Heavy-ion Accelerator Facility (HIAF) is a new heavy ion accelerator facility in China. HIAF Fragmentation Separator (HFRS) is a fragmentation separator which employs coil dominated superconducting DCT multipoles and superferric dipoles operating at 4.5 K. A 2.5 kW helium refrigerator and a helium distribution system are designed for the operation of all 24 superconducting magnet cryostats, some of which contains more than one magnet. In this paper, we will discuss the key features of the whole cryogenic system include the cooling method, the refrigerator, and the cryogenic distribution system.