Quench-protected, refrigerated superconducting magnet

Details Quench-protected, refrigerated superconducting magnet Quench-protected, refrigerated superconducting magnet

1994-02-25

1995-04-25

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Superconductive type

62 511, H01F 100, F25B 1900

Patent

active

054102863

ABSTRACT:
A superconducting magnet including a superconducting coil assembly having a magnet cartridge, a cryocooler coldhead having a cold stage in thermal contact with the magnet cartridge, and a thermal buffer assembly. The thermal buffer assembly includes an inlet tube and an outlet tube each having an end connected to a helium pressure container which is placed in thermal contact with the magnet cartridge. A first gas pressure regulator on the inlet tube supplies helium gas and a second gas pressure regulator on the outlet tube vents helium gas so as to maintain a generally constant pressure for the helium gas within the helium pressure container. The high specific heat per unit volume of the pressurized gaseous helium acts as a thermal buffer to extend the time the magnet can operate superconductively without the cryocooler before quenching, such as during an electric power outage.

REFERENCES:
patent: 3428926 (1969-02-01), Bogner et al.
patent: 3491547 (1970-01-01), Watkins
patent: 3823575 (1974-07-01), Parel
patent: 4080802 (1978-03-01), Annable
patent: 4689970 (1987-09-01), Ohguma
patent: 4782671 (1988-11-01), Breneman
patent: 4791241 (1988-12-01), Ando et al.
patent: 5287914 (1994-02-01), Hughes
patent: 5293752 (1994-03-01), Nagao

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