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为了设计用于在4.2K获得0.5W的朱尔—汤姆森膨胀过程的深冷器,需要一个预冷系统,该系统用于进入朱尔—汤姆森阀门的氦气,它可以借助于两级吉福德—麦克梅宏(Gifford—McMahon)深冷器来实现。如同用一个类似的装置(尽管是小尺寸的)求得再热器热效率的大小一样,本文简要地说明用预冷装置样机求得的某些初步规格,提出逆流热交换和等温热交换预冷系统方案,并描述朱尔—汤姆森深冷器与吉福德—麦克梅宏深冷器连接的热开关。
In order to design a cryostat for obtaining a 0.5W Joule-Thomson expansion at 4.2K, a precooling system is required for helium entering the Juer-Thomson valve, which can be accomplished by means of two stages Gifford - McMahon (Gifford-McMahon) deep cooler to achieve. As with a similar device (albeit a small one), the thermal efficiency of the reheater is the same as the size of the thermal efficiency of the reheater. This article briefly describes some of the preliminary specifications obtained with the prototype of the precooler, proposing a countercurrent heat exchange and an isothermal heat exchange Cold system solution and describes the thermal switch that connects the Juer-Thomson cryocoil to the Gifford-MacMarcme cooler.