Actively shielded magnetic resonance magnet without cryogens

Details Actively shielded magnetic resonance magnet without cryogens Actively shielded magnetic resonance magnet without cryogens

1990-04-05

1991-09-03

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

335299, 335216, 335302, 505879, 174 154, 324318, H01F 722

Patent

active

050458264

ABSTRACT:
An actively shielded refrigerated superconductive magnet is provided. The magnet includes a generally cylindrical vacuum vessel having an axially extending bore. A plurality of superconductive main coils are positioned in the vacuum vessel concentrically surrounding and spaced away from the bore. A pair of superconductive shield coils having a larger diameter than the superconductive main coils are situated in the vacuum vessel, concentric with the superconductive main coils. The superconductive shield coils are situated at either end of the superconductive main coils. The superconductive shield coils and the superconductive main coils are electrically connected to one another so that the superconductive shield coils and the superconductive main coils are capable of carrying current in opposite circumferential directions. A thermal shield encloses the superconductive main and shield coils, with the thermal shield spaced away from the vacuum vessel and superconductive main and shield coils. A two stage cryocooler is provided for cooling the superconductive main and shield coils, and the thermal shield.

REFERENCES:
patent: 4771256 (1988-09-01), Laskaris
patent: 4782671 (1988-11-01), Breneman
patent: 4837541 (1989-06-01), Pelc
patent: 4895831 (1990-01-01), Laskaris
patent: 4924198 (1990-05-01), Laskaris
patent: 4935714 (1990-06-01), Vermilyea

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