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New methods for nuclear cooling into the microkelvin regime

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Abstract

We describe the philosophy and practice of a new method of nuclear cooling in which the copper refrigerant is immersed directly in the3He sample to be cooled using a guard cell configuration. The method has been used to cool liquid3He to ∼120 µK. We also describe a variant of the method intended for cooling metallic samples, by which a platinum NMR thermometer has been cooled to ∼13 µK. Finally, in an appendix we suggest a very simple nuclear cooling method utilizing the copper flakes used in the manufacture of paint, which will cool liquid3He to around 1 mK with a minimum of cryogenic effort.

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Author notes

  1. D. I. Bradley

    Present address: Clarendon Laboratory, Oxford, UK

  2. W. P. Pratt Jr.

    Present address: Physics Department, Michigan State University, East Lansing, Michigan

Authors and Affiliations

  1. Department of Physics, University of Lancaster, Lancaster, UK

    D. I. Bradley, A. M. Guénault, V. Keith, C. J. Kennedy, I. E. Miller, S. G. Mussett, G. R. Pickett & W. P. Pratt Jr.

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  1. D. I. Bradley
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  2. A. M. Guénault
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  3. V. Keith
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  4. C. J. Kennedy
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  5. I. E. Miller
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  6. S. G. Mussett
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  7. G. R. Pickett
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  8. W. P. Pratt Jr.
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Bradley, D.I., Guénault, A.M., Keith, V. et al. New methods for nuclear cooling into the microkelvin regime. J Low Temp Phys 57, 359–390 (1984). https://doi.org/10.1007/BF00681199

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  • DOI: https://doi.org/10.1007/BF00681199

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