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A continuously operating dilution microcryostat

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Abstract

A dilution microcryostat based on the technology of sorption evacuation of 3He and 4He and condensation evacuation of a 3He + 4He mixture in a dilution cycle is described. A low temperature of ∼0.1 K during regeneration of sorbers is continuously maintained owing to the high specific heat of the cryostat unit, in which circulating helium condensates. The cryostat is manufactured in the form of an insert in an industrial 35-L portable Dewar flask for liquid helium. A cold sample holder is positioned in the upper part of the device, thus facilitating the access to it. The complete volume of liquid helium suffices for 6–7 days of operation including the consumption of 4He for preliminary cooling of the cryostat from nitrogen temperature. During this period, a low temperature of the sample holder can be maintained with an accuracy of ∼1 mK. The device operates under computer control.

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Authors and Affiliations

  1. Kapitza Institute for Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, Moscow, 117334, Russia

    V. S. Edelman

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  1. V. S. Edelman
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Correspondence to V. S. Edelman.

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Original Russian Text © V.S. Edelman, 2012, published in Pribory i Tekhnika Eksperimenta, 2012, No. 1, pp. 154–157.

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Edelman, V.S. A continuously operating dilution microcryostat. Instrum Exp Tech 55, 145–148 (2012). https://doi.org/10.1134/S0020441212010277

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  • DOI: https://doi.org/10.1134/S0020441212010277

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