Closed cycle cooling of infrared detectors to 250 mK

R. S. Bhatia, S. T. Chase, W. C. Jones, B. G. Keating, A. E. Lange, P. V. Mason, B. J. Philhour, G. Sirbi

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We have designed and built a cryogenic system which uses no expendable liquid cryogens and consists of a three-stage cryocooler together with a three-stage sorption cooler to achieve a base temperature of 239 mK. We achieve a temperature of 250 mK at the expected 0.5 μW loading. The duty cycle of the sorption cooler alone is 93%. The cryogenic system is designed for autonomous cycling and operation, and will be used to cool the detectors and optics on the Polatron instrument to observe the 2.7 K cosmic microwave background.

Original languageEnglish (US)
Pages (from-to)113-122
Number of pages10
Issue number2
StatePublished - Feb 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • General Physics and Astronomy


  • Gifford-McMahon
  • He Systems
  • Infrared detectors
  • Joule-Thomson Coolers
  • Sorption Coolers


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