SUPERCONDUCTING DEVICE

Japanese Patent JPH01149406

A

PURPOSE:To facilitate the work of mounting a refrigerator to and dismounting it from a cryostat as well as to reduce the maintenance period of the refrigerator by a method wherein a radiant shielding plate is thermally connected to the gas piping of the freezing container containing a superconducting conductor, and the cooling pipe of the refrigerator is inserted into the gas piping. CONSTITUTION:After a refrigerator has been evacuated from A valve 22 in the state wherein a valve 21 is closed, helium gas is filled in and the valve 22 is closed. Then, liquid nitrogen is filled into a freezing medium container 4 from a freezing medium filling pipe 6, a superconducting coil 1 is cooled down to the temperature of the liquid nitrogen, and the operation of a refrigerator 11 is started. Subsequently, the liquid nitrogen collected in the cooling medium container is driven out, liquid helium 2 is filled into the cooling medium container. As a result, even when helium gas leaks a little from the casing of the refrigerator, the evaporated gas is always replenished, and an 80K shield 9 and a 20K shield can be cooled in the refrigerator casing. When a maintenance work is conducted on the refrigerator, it can be done easily without evacuating the refrigerator casing, because it is always filled up with the helium gas.

NEMOTO TAKEO
OGATA HISANAO
SAEKI MITSURU
KIKUCHI KENICHI

JP30753687A

June 12, 1989

December 07, 1987

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HITACHI LTD
HITACHI CABLE

F17C3/08; H01F6/04; H01L39/04; (IPC1-7): F17C3/08; H01F7/22; H01L39/04

Katsuo Ogawa (1 person outside)

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