Application of a Superfluid Valve in a Variable-Temperature Dewar
The study of properties of materials at low temperatures is facilitated by an apparatus which can conveniently vary the temperature of an experimental sample. One simple method in common use is to suspend the sample from a cold finger in the vacuum or inner-wall space of a liquid-helium dewar. This paper describes a modified version of this method. Two useful innovations are a demountable outer glass shell and the use of a superfluid valve f1] for transferring helium from the dewar reservoir to a cold-finger reservoir.
KeywordsOuter Shell Copper Foil Radiation Shield Superfluid Helium Cold Finger
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