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Compressional cooling of He3 to millidegree temperatures

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Abstract

A study of adiabatic compressional cooling of a two-phase mixture of solid and liquid He3 has been made. Details of the experimental arrangement are given. Using a flexible elastic low temperature He3 cell that is compressed by liquid He4 and precooled by a continuously operating dilution refrigerator, cooling to below 2 m°K was obtained from starting temperatures near 20 m°K. Frictional heating is remarkably low. Calculations are presented which investigate the fraction of solid formed and which suggest rather long thermal equilibrium times in the solid He3 nuclear spin system. Application of the method to the production of bulk polarized He3 nuclei is discussed.

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Additional information

This research was supported by the U.S. Atomic Energy Commission under contract AT(11-1)-34, P.A. 143.

This work is based on the thesis of R. T. Johnson, submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the University of Illinois.

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Johnson, R.T., Wheatley, J.C. Compressional cooling of He3 to millidegree temperatures. J Low Temp Phys 2, 423–448 (1970). https://doi.org/10.1007/BF00652512

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Keywords

  • Magnetic Material
  • Thermal Equilibrium
  • Spin System
  • Equilibrium Time
  • Nuclear Spin