| 摘要 |
Apparatus for maintaining a superconducting magnet (4) which is refrigerated within a cryostat (2) at or near its operating temperature in the event of the cryostatic refrigerator ceasing to operate comprising a heat sink within the cryostat and in thermal communication with the magnet (4) and means automatically to transfer heat from the heat sink out of the cryostat. The heat sink comprises a small gas vessel (8) containing helium anchored to the magnet (4). The vessel (8) is connected to a large vessel (10), outside the cryostat (2) by a small bore tube (12). A regulator (16) in the tube (12) restricts the flow of helium gas from vessel (10) to vessel (8) but permits the gas to flow freely in the opposite direction. In the event of failure of the refrigerator, gas is expelled from vessel (8) taking up heat as it does so. <IMAGE>
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