SUSPENSION SYSTEM FOR MAGNETIC RESONANCE CRYOSTAT

摘要

A cryostat (11) for a magnetic resonance magnet is provided comprising an outer closed cylindrical vacuum vessel (13) and a cylindrical helium vessel (23) concentrically situated in the cryostat. A first cylindrical shield (21) is situated in the cryostat surrounding the second shield (17). A plurality of tubular struts (75) are affixed to both the helium vessel circular end faces and the second shield (17). The tubular struts are circumferentially spaced and extend radially, parallel to the end shields of the helium vessel. The struts support the second shield spaced away from the helium vessel. Plate means (80) are circumferentially spaced about the circular end faces of the first shield and affixed thereto. The plates (80) extend radially, parallel to the end faces of the first shield and affixed to the inner circular end faces of the second shield, supporting the first shield spaced away from the second shield. The helium vessel (23) has on its outside surface radially extending trunnions (67) situated symmetrically on a horizontal plane passing through the center of the helium vessel and mounting supports on either circular end face of the helium vessel, with supports on each of the upper and lower portions. A plurality of straps (55) have one end of each strap looping about a respective one of the trunnions. The other end of each strap is rotatably secured to the circular end faces of the vacuum vessel, with the straps from the trunnions closest to an end face secured to that end face. Additional composite straps (31) with one end rotatably mounted to each end face; the other end is mounted to the helium vessel. The composite straps on each face are parallel to the circular end faces of the vacuum vessel and the helium vessel. The composite straps are symmetrically located about the vertical and horizontal axes of the helium vessel.