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Nuclear refrigeration and thermometry at microkelvin temperatures

✍ Scribed by Frank Pobell

Book ID
104625993
Publisher
Springer US
Year
1992
Tongue
English
Weight
685 KB
Volume
87
Category
Article
ISSN
0022-2291

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✦ Synopsis

The present status and problems of refrigeration and thermometry at micro. kelvin temperatures will be discussed. It will be shown that a better understanding of internal, time dependent heat leaks and of thermal boundary resistances as well as further progress in thermometry are necessary to reduce the present minimum temperature of about IO I~K to which matter has been refrigerated.

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In order to avoid possible sources of heat leaks into liquid 3He-4He mixtures we have constructed an experimental setup using only materlals of high purity. The inner part of an Ag-cell was furnished with a 700~-Ag sinter (A = llOm 2) and two vlbratlng wires. The temperature of the cell wall was mea