NASA NTRS · 20230010022
A Four-Stage Continuous ADR for Space Missions
Abstract
The cryogenics group at NASA-Goddard has provided adiabatic demagnetization refrigerators (ADRs) for cooling detectors to sub-Kelvin temperatures in space. These ADRs were single-shot devices that produced cooling at 0.05 K for tens of hours before needing to be recycled. Our group also developed a four-stage laboratory ADR system which holds one stage continuously at 0.05K, or colder, while using the other stages to pump heat from the continuous stage up to a heat sink near 4K. This continuous ADR (CADR) provides a useful cooling power that is more than 10 times greater at 0.050 K than what was required by the single-shot space systems. Over the past several years, this system was updated so that it can withstand the rigors of a launch into space. We describe this development process and report its final results.
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Jim Tuttle, Amir Jahromi, Mark Kimball, Richard Ottens, Evan Sheehan, Ed Canavan, Mike DiPirro, Peter Shirron. A Four-Stage Continuous ADR for Space Missions. https://ntrs.nasa.gov/citations/20230010022
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