1. Closed cycle cooling of infrared detectors to 250 mK
- Author
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Bhatia, R.S., Chase, S.T., Jones, W.C., Keating, B.G., Lange, A.E., Mason, P.V., Philhour, B.J., and Sirbi, G.
- Subjects
- *
INFRARED detectors , *ABSORPTION , *LOW temperature engineering - 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 0.5μ 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. [Copyright &y& Elsevier]
- Published
- 2002
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