Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Superconductive type
Patent
1988-07-05
1990-05-08
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Superconductive type
335299, 505 1, 174154, 324318, H01F 722
Patent
active
049241982
ABSTRACT:
A superconductive magnet for magnetic resonance imaging not requiring consumable cryogens or requiring cryogen liquid or vapor cooling of superconducting coils is provided having a resin impregnated coil of superconductor wire. Heat conductive means having a thermal conductivity greater than the resin, contact the impregnated coil along the length of at least one of the impregnated coil surfaces. A thermal radiation shield is spaced away from and surrounds the resin impregnated coil and heat conductive means. An evacuable housing is spaced away from and surrounds the shield. The housing supports the shield, heat conductive means and the impregnated coil. A multiple stage cryocooler is mounted in the housing with one stage of the cryocooler thermally coupled to the radiation shield and with another stage capable of achieving lower temperatures than the stage coupled to the shield, thermally coupled to the heat conductive means, so that superconductive operation in a vacuum can occur without the coil being immersed in cryogen liquid or vapor.
REFERENCES:
patent: 4726199 (1988-02-01), Takano et al.
J. E. Ostenson et al., "Performance of Nb.sub.3 Sn--Cu In Situ Conductor in a Superconducting Magnet", Advances In Cryogenic Engineering vol. 32 pp. 841-844 (1986), (ICMC Conference Aug. 12-16, 1985).
Davis Jr. James C.
General Electric Company
Harris George
Steinberg William H.
Webb II Paul R.
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