An adiabatic demagnetization refrigerator for SIRTF

Details An adiabatic demagnetization refrigerator for SIRTF An adiabatic demagnetization refrigerator for SIRTF

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989itns...36..898t&link_type=abstract

(IEEE, DOE, NIST, et al., 1988 Nuclear Science Symposium, Orlando, FL, Nov. 9-11, 1988) IEEE Transactions on Nuclear Science (IS

Physics

2

Adiabatic Demagnetization Cooling, Infrared Detectors, Refrigerators, Space Infrared Telescope Facility, Balloon-Borne Instruments, Bolometers, Feedback Control, High Temperature Superconductors, Thermal Stability

Scientific paper

An adiabatic demagnetization refrigerator (ADR) has been proposed to cool bolometric infrared detectors on the multiband imaging photometer of the Space Infrared Telescope Facility (SIRTF). One such refrigerator has been built which uses a ferric ammonium alum salt pill suspended by nylon threads in a 3-T solenoid. The resonant modes of this suspension are above 100 Hz. The heat leak to the salt pill is less than 0.5 microW. The system has a hold time at 0.1K of more than 12 h. The cold stage temperature is regulated with a feedback loop that controls the magnetic field. A second, similar refrigerator is being built at a SIRTF prototype to fly on a ballon-borne telescope. It will use a ferromagnetic shield. The possibility of using a high-Tc solenoid-actuated heat switch is also discussed.

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