The Bayreuth nuclear demagnetization refrigerator

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 1987 English Publisher:Springer Science and Business Media LLCJournal:Journal of Low Temperature Physics, volume 73, pages 101-136 (issn: 0022-2291, eissn: 1573-7357,

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Authors: P. Smeibidl; K. Gloos; C. J. Kennedy; R. M. Mueller; F. Pobell; P. Sekowski; A. Singsaas;

doi: 10.1007/bf00681746 , 10.7567/jjaps.26s3.1715

The Bayreuth nuclear demagnetization refrigerator

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Abstract

In this letter we report on the construction and operation of the new nuclear refrigerator at the University of Bayreuth. It contains two Cu stages of 103.5 moles in 8 Tesla and 2 moles in 9 Tesla, respectively. After demagnetization the first stage has cooled a Pt-NMR thermometer in the field free experimental region to 15 µK. The large heat capacity of the stage has enabled us to hold this low temperature for 50 h without any sign of warming. In a preliminary test under nonideal conditions the second stage has cooled another Pt-NMR thermometer in the high field region to 12 µK.

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University of Bayreuth
Germany

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