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To improve the operation of cryostat for superconducting magnet system,it is an effective approach to employ a cryocooler to cool down the superconducting magnet and condense the helium vapor.Pulse tube (PT) cryocooler has no moving parts in the low-temperature region compared with traditional refrigerators such as Gifford-McMahon (GM) and Stirling cryocooler.