Abstract:

Besides high temperature plasma heated to millions of degrees, there are 4.5 K supercritical helium provided by cryogenic system in the “artificial sun” EAST device to cool the superconducting magnets to below the critical temperature. At present, EAST cryogenic system is still the largest cryogenic helium system in China and its equivalent refrigerating capacity at 4.5 K is over 2 kW. This paper introduces the working principle and system composition of EAST cryogenic system, describes compressor station, refrigerator, distribution system and cryogenic measurement and control system. Finally, the operation of EAST cryogenic system is briefly described.