A model is presented for a nuclear demagnetization cooling system in which the metallic refrigerant is distributed over a region where the magnetic field varies by a large amount. A method employing “quasi-steady-state” approximations is used to solve the problem in the framework of finite difference procedures. The predictions from the model are used to establish a number of design parameters in cryostats for studies of superfluid 3He and ultra-low-temperature metals physics.
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Work supported by the National Science Foundation under grants DMR 76-21370 and DMR76-05181.
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Shen, S.Y., Ketterson, J.B. & Halperin, W.P. Refrigeration by adiabatic demagnetization of nuclear spins. J Low Temp Phys 31, 193–222 (1978). https://doi.org/10.1007/BF00116237
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DOI: https://doi.org/10.1007/BF00116237