Patent ID: 6396377
Filing Date: 2002-05-28
Classification: H01F,Y10S

Abstract:
A superconducting magnet assembly comprising in combination:two separate toroidally shaped superconducting magnet coils positioned in spaced apart relationship to define access to a magnetic field along an X, Y, and Z axis originating from the center of the magnetic field, each of said magnet coils contained within and spaced apart from an outer vacuum jacket; at least one radiation shield disposed within each of said vacuum jackets between each of said magnet coils and its vacuum jacket; and two separate two stage closed cycle refrigerators, each of said two stage closed cycle refrigerators having a second stage, with said second stage of each of said two stage closed cycle refrigerators directly connected to a different one of said magnet coils to cool said magnet coils to a temperature at which superconductivity takes place, and a first stage of each of said two stage closed cycle refrigerators directly connected to a radiation shield for said magnet coil cooled by said second stage of said two stage closed cycle refrigerator to cool said radiation shield to a temperature above said temperature at which superconductivity takes place.