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Paramagnetic salt pill design for magnetic refrigerators used in space applications.

Author(s) : HAGMANN C., BENFORD D. J., RICHARDS P. L.

Type of article: Article

Summary

An adiabatic demagnetization refrigerator is described which was designed for use in the multiband imaging photometer for the Space Infrared Telescope Facility. This refrigerator was required to cool bolometric detectors for infrared and millimeter waves to 0.1 K. An unusual paramagnetic salt, chromic caesium alum (CCA), is used. The cycle time for the refrigerator has been reduced to about 30 minutes by attention to thermal time constants and by growing the CCA salt directly onto an array of gold wires. Crystal growing procedures were developed to overcome problems with the low solubility of CCA in water. The salt pill is sealed in stainless steel to retain water of hydration and is constructed of materials which are not corroded by commonly used paramagnetic salts.

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