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Small scale 4He liquefaction using a two-stage 4 K pulse tube cooler

✍ Scribed by G Thummes; C Wang; C Heiden

Book ID
104111421
Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
460 KB
Volume
38
Category
Article
ISSN
0011-2275

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✦ Synopsis

On the basis of previous results obtained with a two-stage pulse tube cooler that was able to provide a net cooling power of up to 0.37 W at 4.2 K, a somewhat modified version has been built to use it for small scale 4 He liquefaction. This paper presents first results obtained with this liquefier, which was operated with a GM-rotary valve and a GM-type compressor of 6 kW input power. After the initial cool down period of about two hours for the second stage, a steady liquefaction rate of 0.13 l/h at 4.2 K was obtained for 4 He gas entering the cooler under normal pressure at room temperature. The liquid was collected in a vacuum insulated pot surrounded by a radiation shield attached to the first stage. No precooling of the 4 He gas other than by the first and second stage was used.

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