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A cryogenic system for studying the properties of He3 between 1 and 15 mK

✍ Scribed by T.A. Alvesalo; Yu.D. Anufriyev; P. Buch Lund; H.K. Collan; M.T. Loponen

Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
725 KB
Volume
14
Category
Article
ISSN
0011-2275

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✦ Synopsis

A cryogenic system for studying the properties of He 3 between I and 15 mK is described. The apparatus has been utilized for measurements of viscosity and heat capacity of liquid He 3 along the melting curve. He 3 is refrigerated in two steps. For temperatures down to about 15 mK a rather powerful dilution refrigerator, with a circulation rate of 70 pmoles s" 1, is used. This machine has sintered copper heat exchangers of novel design. Below 15 mK He 3 is self-cooled through adiabatic compression of a liquid/solid mixture (Pomeranchuk's method). A description of constructional details and performance characteristics of the dilution refrigerator and the compressional cooling cell is given. Some aspects of thermometry are also discussed.

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