Adiabatic expansion of 3He in 4He

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Abstract

In 1951 H. London proposed the adiabatic expansion of 3He in 4He to obtain cooling in the millikelvin range. In this paper the feasibility of the technique is investigated to provide a cooling power of 1 μW at 50 mK. Injecting 4He in a fixed amount of 3He is, in principle, a single-cycle method but it can produce continuous cooling by using two such expanders working in opposite phase. It is independent of gravity, so it may be a candidate for cooling in space. In contrast to the Planck mission it is a closed system which uses fixed amounts of 3He and 4He.

Original languageEnglish
Pages (from-to)83-89
Number of pages7
JournalCryogenics
Volume96
DOIs
Publication statusPublished - 1 Dec 2018

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