Metrological requirements and practical aspects of heat flux calculations in ultracold neutron converters
Sauleyeva A. Korshikov Y. Turlybekuly K. Aldiyarov A. Yerezhep D.
1 November 2025American Institute of Physics
Low Temperature Physics
2025#51Issue 111393 - 1397 pp.
This article presents a comprehensive set of experimental and computational methods aimed at determining heat transfer regimes in superfluid helium-4, evaluating thermal resistance at various temperatures, and developing a scalable model for analyzing the performance of an ultracold neutron (UCN) converter. The results obtained constitute an essential part of the scientific foundation required for the development and optimization of modern UCN sources, which operate on the principle of neutron thermalization through inelastic interactions with the medium. This study is fundamental in nature and is oriented toward addressing strategically important problems in neutron physics, such as refining the neutron lifetime and searching for the neutron electric dipole moment. These challenges are crucial for advancing our understanding of nucleosynthesis and the formation of matter in the early Universe. The advancement of heat transfer models in cryogenic environments, particularly in superfluid helium, plays a key role in ensuring the stability and efficiency of UCN sources. The paper discusses approaches to the metrological verification of thermal parameters and provides recommendations for applying the results in future engineering and design developments.
heat transfer , metrology , neutron physics , scaling , superfluid helium , thermal resistance , ultracold neutrons
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Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Institute of Nuclear Physics, Ministry of Energy of the Republic of Kazakhstan, Almaty, 050032, Kazakhstan
Department of Science and Innovation, Mukhametzhan Tynyshpayev ALT University, Almaty, 050012, Kazakhstan
Al-Farabi Kazakh National University
Institute of Nuclear Physics
Department of Science and Innovation
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