Adiabatic expansion of 3He in 4He

A.T.A.M. de Waele

doi:10.1016/j.cryogenics.2018.10.007

Adiabatic expansion of ³He in ⁴He

A.T.A.M. de Waele

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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 language	English
Pages (from-to)	83-89
Number of pages	7
Journal	Cryogenics
Volume	96
DOIs	https://doi.org/10.1016/j.cryogenics.2018.10.007
Publication status	Published - 1 Dec 2018

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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.",

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AB - 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.

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ER -

Adiabatic expansion of ³He in ⁴He

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