| 摘要 |
A cryostat arrangement has an outer jacket, a first tank with a first cryogen, and a second tank with a second liquid cryogen which boils at a higher temperature than the first cryogen. The first tank comprises a neck tube, whose hot upper end is connected to the outer jacket at ambient temperature and whose cold lower end is connected to the first tank at a cryogenic temperature. The arrangement uses a riser pipe protruding into the second tank through which the second liquid cryogen can flow out of the second tank and into a first heat exchanger in thermal contact with the neck tube. An outflow line is provided through which second cryogen evaporating from the first heat exchanger can flow out and into an optional second heat exchanger. It is thus possible to greatly reduce heat input from the neck tube into the first tank. |
