✦ LIBER ✦

Closed cycle liquid helium refrigerators

✍ Scribed by G. Claudet; R. Lagnier; A. Ravex

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 292 KB
Volume: 32
Category: Article
ISSN: 0011-2275
DOI: 10.1016/0011-2275(92)90107-l

No coin nor oath required. For personal study only.

✦ Synopsis

We have developed closed cycle liquid helium refrigerators using a Joule Thomson circuit precooled by commercially available two staged Gifford Mac Mahon cryocoolers. The Joule Thomson counterflow heat exchangers are modular and have been thermo-hydraulically characterized. Fully automatic cool down and operation are achieved by two pneumatically driven by pass and expansion valves. Several apparatus have been built or are under assembly with cooling power ranging from 100 mW up to 5 Watt, for temperature ranging from 2.8 K up to 4.5 K. A trouble free operation with several warm up and cool down cycles has been proven over 7000 hours.

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