초록 ▼

Two pair of thermal shield axial supports are provided. Each support includes a strand of wire brazed on either end into threaded studs. One stud is threaded into a topped hole in the end of the magnet cartridge. The stud on the other end extends through a clearance hole on the end flange of the the

Two pair of thermal shield axial supports are provided. Each support includes a strand of wire brazed on either end into threaded studs. One stud is threaded into a topped hole in the end of the magnet cartridge. The stud on the other end extends through a clearance hole on the end flange of the thermal shield. Belleville spring washers are compressed against the shield by a nut. Prior to cool down, the Belleville washers are compressed. As the shield and magnet cool down, the shield contracts axially with respect to the magnet cartridge, thus relaxing the washer stack compression. The wire tension relaxes from the maximum pretension to a nominal tension at operating temperature.

대표청구항 ▼

A superconductive MR magnet comprising: a generally cylindrical vacuum vessel defining an axially extending bore; a magnet cartridge having a cylindrical shape and situated in the vacuum vessel concentric with and spaced away from the bore of the magnet; a thermal shield surrounding said magnet cart

A superconductive MR magnet comprising: a generally cylindrical vacuum vessel defining an axially extending bore; a magnet cartridge having a cylindrical shape and situated in the vacuum vessel concentric with and spaced away from the bore of the magnet; a thermal shield surrounding said magnet cartridge and spaced away from said magnet cartridge and said vacuum vessel; and a pair of thermal shield axial supports, each support comprising a wire tensioned between an end of the magnet cartridge and an adjacent end of the thermal shield, and means for securing said wire to said thermal shield so that as the end thermal shield and the end of the magnet cartridge move towards one another, the tension in the wire is reduced elastically.