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System for warming-up and cooling-down a superconducting magnet

  • US 10,704,809 B2
  • Filed: 12/20/2016
  • Issued: 07/07/2020
  • Est. Priority Date: 12/20/2016
  • Status: Active Grant
First Claim
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1. A servicing system for servicing a target object disposed in a target object cryostat, the servicing system comprising:

  • one or more expanders and one or more compressors for cooling-down the target object to a cryogenic temperature;

    one or more heaters for warming-up the target object from the cryogenic temperature;

    a fan and a fan circuit, the fan circulating gas through the fan circuit; and

    a refrigerator cryostat housing the one or more expanders and the fan which are surrounded by a vacuum;

    a plurality of heat exchangers for transferring heat from the heater to the gas in the fan circuit during warm-up of the target object and for transferring heat from the target object to the gas in the fan circuit during cool-down of the target object;

    a controller and a plurality of sensors, the plurality of sensors for measuring a temperature and a pressure in the fan circuit, the controller responsive to the plurality of sensors controlling at least a speed of the fan, a speed of the expanders, and a power of the heaters;

    a removable supply transfer line for bringing gas from the fan circuit to the target object cryostat;

    a removable return transfer line for returning gas from the target object to the fan circuit, the transfer lines being interchangeably connected to the target object cryostat;

    a pressure relief valve for relieving excess pressure in the fan circuit; and

    a vent valve that can be actuated to open to one of atmospheric pressure and a gas recovery system.

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