Abstract
In the efforts of obtaining a more pronounced plasma shape, the HL-2A tokamak at the Southwestern Institute of Physics, China National Nuclear Corporation (CNNC-SWIP) is currently being upgraded to possess a more powerful, compact and efficient divertor. The now HL-2M tokamak is comprised of a 500 W/4.5 K helium refrigerator for the combined cooling of cryopumps, superconducting magnets and thermal shields. The construction of the helium management system was finished last year. The manufacturing and assembling of the refrigerator were finished in August of 2019, and the refrigerator will be commissioned toward the end of this year. The installation of the cryogenic distribution system will be finished in February of 2020. The first commissioning of the entire system will be soon after five months. This paper presents the design and the construction states of the HL-2M cryogenic system.
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