Superconducting switch pack

Details Superconducting switch pack Superconducting switch pack

1988-02-25

1990-07-24

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Superconductive type

338325, H01F 772

Patent

active

049437925

ABSTRACT:
A superconducting switch pack has six switch elements arranged with three in each of two planes. Each switch element is made of a length of cupro-nickel matrix multi-filamentary superconducting wire which is formed into a serpentine shape so as to be bifilar. Primary and back-up heater elements are positioned between the planes of switch elements, and all of the switch elements and heater elements are encapsulated in a solid resin body, with their leads extending outside of the body for connection to electrical circuits. This construction results in a stable superconducting switch pack which is non-inductive, has a high current carrying capability and off resistance. This reduces cryogen boil off of the superconductive circuits connected to the switch pack and makes the switch pack particularly suited for the shim coils of an MR magnet. Each section of the switch pack can also keep magnetic field drifts of the individual superconductive coils to less than 0.1 ppm/Rour and a number of superconducting coil can be simultaneously switched.

REFERENCES:
patent: 3054978 (1962-09-01), Schmidlin et al.
patent: 3359394 (1967-12-01), Mains
patent: 3715703 (1973-02-01), Croso et al.
patent: 4010047 (1977-03-01), Frohmader
patent: 4164777 (1979-08-01), Kneip et al.
patent: 4586017 (1986-04-01), Laskaris
patent: 4602231 (1986-07-01), Purcell et al.
patent: 4635015 (1987-01-01), Franksen
"Critical Current and Stability Effects Between 0 and 6 Tesla in Mono and Multifilamentary NbTi Conductors Having A CuNi Matrix", HHJ ten Kate, AJM Roovers and LJM van de Klundert, IEEE Transactions on Magnetics, vol. MAG-21, pp. 363-365, Mar., 1985.

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