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 language | English (US) |
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Pages (from-to) | 113-122 |
Number of pages | 10 |
Journal | Cryogenics |
Volume | 42 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2002 |
Externally published | Yes |
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