Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Superconductive type
Patent
1993-12-17
1994-11-01
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Superconductive type
361 19, 361141, H01F 100, H02H 700, H01H 4700
Patent
active
053610555
ABSTRACT:
A persistent switch system for protecting a large superconducting magnet coil during quench while providing the necessary different resistances needed for operation of the system in coil charging, discharging, persistent and quench modes while minimizing the heat load on the system refrigerator. The system includes a circuit having a combined persistent switch and shunt heater coil using two superconductor coils in parallel with a normal resistive thermal shunt coil thermally linked to the superconducting magnet coil. Switch superconducting coils can be driven normal to provide the switch resistance needed for efficient charging/discharging or the resistance needed to drive sufficient current through the shunt resistor coil during a quench. The quench operation uses shunt coil heating to enhance normal zone growth in the main coil, limiting the maximum quench temperatures reached. This system eliminates the heat leaks resulting from mechanical switches and allows the use of removable charge/discharge leads and their associated high heat leaks to significantly reduce the heat load on the refrigeration system, which typically operates at liquid helium temperatures.
REFERENCES:
patent: 4763221 (1988-08-01), Takechi
patent: 4764837 (1988-08-01), Jones
patent: 4930034 (1990-05-01), Kusserow
patent: 5021914 (1991-06-01), Tsurunaga
patent: 5093645 (1992-03-01), Dorri
patent: 5153804 (1992-10-01), Pham
patent: 5204650 (1993-04-01), Nemoto
patent: 5210674 (1993-05-01), Yamaguchi
patent: 5227755 (1993-07-01), Westphal
Duncan John R.
General Dynamics Corporation
Gilliam Frank D.
Picard Leo P.
Ryan Stephen T.
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