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Abstract <p>A computational method for the rate of superfluid helium condensation in the chamber of an ultracold neutron source for the PIK reactor was described. The theoretical helium condensation rate of 5.36&#xa0;L/h was obtained. To evaluate the calculation results, a full-scale experiment on helium condensation in a closed vessel was carried out. The experiment was performed by using a KG60/300-1 helium cryostat connected to the technological complex of superfluid helium production for the ultracold neutron source. The temperature in the cryostat was maintained by evacuation. The liquefaction rate during the experiment was 1.64 L/h to confirm the proposed theoretical computational model predicting the liquefaction rate of 1.72&#xa0;L/h with a good precision. The time of attaining the operating regime temperature by the ultracold neutron source was estimated as 6.5 h at a total liquid helium consumption of 64 L. This estimate will be taken into account when planning the normal operation of the ultracold neutron source for the PIK reactor.</p>

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Computational Model of Superfluid Helium Condensation in the Chamber of an Ultracold Neutron Source for the PIK Reactor

  • 期刊论文

  • 发表日期：

    2025年12月21日

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  • V. A. Lyamkin,
  • A. P. Serebrov,
  • A. O. Koptyukhov,
  • A. V. Sirotin,
  • G. O. Borodinov,
  • A. A. Nedolyak,
  • D. V. Prudnikov,
  • P. A. Hazov

摘要

Abstract

A computational method for the rate of superfluid helium condensation in the chamber of an ultracold neutron source for the PIK reactor was described. The theoretical helium condensation rate of 5.36 L/h was obtained. To evaluate the calculation results, a full-scale experiment on helium condensation in a closed vessel was carried out. The experiment was performed by using a KG60/300-1 helium cryostat connected to the technological complex of superfluid helium production for the ultracold neutron source. The temperature in the cryostat was maintained by evacuation. The liquefaction rate during the experiment was 1.64 L/h to confirm the proposed theoretical computational model predicting the liquefaction rate of 1.72 L/h with a good precision. The time of attaining the operating regime temperature by the ultracold neutron source was estimated as 6.5 h at a total liquid helium consumption of 64 L. This estimate will be taken into account when planning the normal operation of the ultracold neutron source for the PIK reactor.