Abstract
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 4He-3He double-stage refrigerator to precool and intercept the parasitic heatload on a final 3He single-stage refrigerator. This multi-stage configuration permits operation of the refrigerator system without externally pumping on a 4He bath. This results in simpler integration with the instrument and allows scientific 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 μW.
Original language | English (US) |
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Pages (from-to) | 685-691 |
Number of pages | 7 |
Journal | Cryogenics |
Volume | 40 |
Issue number | 11 |
DOIs | |
State | Published - 2000 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Materials Science
- General Physics and Astronomy
Keywords
- Cryostats (F)
- He systems (E)
- Infrared detectors (D)
- Sorption coolers (E)