Superconducting coil device

Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Including superconductivity

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H01F 722, H01F 508

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active

046881379

ABSTRACT:
A superconducting coil device in accordance with the present invention includes a cryostat formed by accommodating liquid helium, a superconducting coil which is accommodated in the cryostat along with liquid helium, a persistent current switch for short-circuiting the ends of the superconducting coil, and a thyristor connected to both ends of the persistent current switch. The gate electrode of the thyristor and the intermediate tap of the superconducting coil are connected via a resistor and/or diode. To both ends of the persistent current switch there are connected each of one end of leads that are formed by superconducting wire, and on the other ends of lead wires there are provided terminals. In addition, in the exterios of the cryostat there is provided a power supply for charging and discharging the superconducting coil by being connected selectively to that terminals.

REFERENCES:
Article on the 31st Cryogenics Engineering Conference in Japan, 1984.
Abstract from vol. 8, No. 49 of Patent Abstracts of Japan, Mar. 6, 1984, "Protecting Circuit for Superconductive Magnet".
J. D. Taylor et al, "Quench Protection for A 2-MJ Magnet", IEEE Transactions on Magnetics, vol. Mag.-15, No. 1, Jan. 1979.
M. Masuda et al, "Superconducting Energy Storage Magnets", IEEE Transactions on Magnetics, vol. Mag.-15, No. 1, Jan. 1978.
"Research and Technical Notes", Cryogenics, vol. 19, No. 8, Aug. 1979, pp. 491-492.

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