Speakers
Description
With the development of superconductivity technology, more and more large scale superconducting coils or magnets are used in the scientific installation like tokomaks, particle accelerators and colliders. Before installation, each coil is needed to cold test at nominal operating current to minimize the risk of malfunction. Hence, a helium refrigerator with an equivalent cooling capacity of 5 kW at 4.5 K for large scale coil test facility is proposed. It can provide 3.7 K, 4.5 K supercritical helium for coil, 50 K cold helium with a 10 g/s flow rate for High Temperature superconducting (HTS) current leads and 50 K cold helium with a cooling capacity of 1.5 kW for thermal shield. This article presents the conceptual design of cryogenic system for large scale superconducting coil test, including system process, thermal cycle, operation modes, compressors station system, cold box, distribution system and cryogenic control system.
