A three-stage helium sorption refrigerator for cooling of infrared detectors to 280 mK
✍ Scribed by R.S. Bhatia; S.T. Chase; S.F. Edgington; J. Glenn; W.C. Jones; A.E. Lange; B. Maffei; A.K. Mainzer; P.D. Mauskopf; B.J. Philhour; B.K. Rownd
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 460 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0011-2275
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✦ Synopsis
We review some of the applications of submillimetre instruments for astronomy and Earth atmospheric sciences where helium sorption refrigerators have been used. We describe a three-stage helium refrigerator which uses a 4 He± 3 He double-stage refrigerator to precool and intercept the parasitic heatload on a ®nal 3 He single-stage refrigerator. This multi-stage con®guration permits operation of the refrigerator system without externally pumping on a 4 He bath. This results in simpler integration with the instrument and allows scienti®c observations to be more easily made. We have achieved a base temperature of 234 mK for a hold time of 20.4 h. The heat lift at 280 mK is 15 lW.