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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

Abstract

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
JournalCryogenics
Volume42
Issue number2
DOIs
StatePublished - Feb 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • General Physics and Astronomy

Keywords

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

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