Thermal coupling, condenser and cryostat incorporating thermal coupling and/or condenser

摘要

A cryostat including a source of refrigeration (44) disposed within an evacuated chamber containing a reservoir (14) of liquified cryogen wherein refrigeration is directed to heat stations (24,26) disposed in the access tube to the reservoir to intercept heat leak into said reservoir and to recondense cryogen boil-off from said reservoir. Thermal couplings (32, 34) are used to cool the heat stations (24, 26) and to minimize heat leakage in the event the refrigeration source is disabled. Cryogen boil-off is condensed in an apparatus (36) utilizing low thermal conductive conduits to direct the vapors to a refrigeration zone and return the condensed cryogen to the reservoir (14).