Patent ID: 7323963

Claim:
A MRI superconductive magnet having a superconductive coil, a liquid vessel containing the superconductive coil and liquid helium used to cool the superconductive coil, a heat shield to accommodate the liquid vessel therein, a vacuum chamber accommodating the heat shield therein, a load supporting body supporting the liquid vessel in the vacuum chamber, and a multi-stage refrigerator extending through said heat shield and into said liquid vessel, the multi-stage refrigerator having a first cold part and a second cold part for cooling a heat exchanger in the liquid vessel for condensing evaporated helium gas, characterized in that: a magnetic shield is provided inside of the heat shield extending from the first cold part of the multi-stage refrigerator to an outer periphery of the second cold part of the multi-stage refrigerator, and a thermal anchor is provided, arranged to directly interconnect thermally the magnetic shield and the liquid helium in the liquid vessel, wherein said magnetic shield is made of aluminum.