Abstract
A prototype adiabatic demagnetization refrigerator (ADR) operating between 2 K and 10 K has been built and tested. The refrigerant for the ADR is Gadolinium Gallium Garnet (GGG). In the design thick slices of single-crystal GGG are sandwiched together with strips of high-purity copper. The copper strips are used to transfer heat between the GGG and the 2 K and the 10 K heat switches. The heat switches employed in the ADR have no moving parts. The 10 K heat switch is a helium gas-gap heat switch; while, the 2 K heat switch is a He II-gap heat switch. Preliminary tests indicate that the prototype ADR can provide 27 mW of cooling at 2 K for 165 s; where, the cycle period is 12.6 minutes. The efficiency of the ADR relative to Carnot is 25%. Methods for improving the efficiency of the system are discussed.
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© 1995 Springer Science+Business Media New York
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Kashani, A., Helvensteijn, B.P.M., McCormack, F.J., Spivak, A.L., Kittel, P. (1995). Development of a Magnetic Refrigerator Operating between 2 K and 10 K. In: Ross, R.G. (eds) Cryocoolers 8. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9888-3_63
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DOI: https://doi.org/10.1007/978-1-4757-9888-3_63
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