Neutron Guide System of the Ultracold Neutron Source for the PIK Nuclear Reactor

IF 0.5 Q4 PHYSICS, PARTICLES & FIELDS

Physics of Particles and Nuclei Letters Pub Date : 2026-02-08 DOI:10.1134/S1547477125701894

A. P. Serebrov, V. A. Lyamkin, A. K. Fomin, A. O. Koptyukhov, D. V. Prudnikov, G. O. Borodinov, S. N. Ivanov, A. N. Murashkin, P. A. Khazov, A. V. Sirotin

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Abstract

The optimization of the neutron guide system of a new ultracold neutron source based on superfluid helium for fundamental interaction physics research at the PIK reactor is considered. In the current configuration, it is planned to achieve a UCN density of 950 cm^–3 in the closed converter chamber. After the upgrade, replacing the steel heat exchanger with a copper one can increase the UCN density in the closed converter chamber to 3400 cm^–3. Monte Carlo simulations for the new source to calculate the UCN densities in the closed converter chamber and at the splitter outlet for future users planning experiments at this source are performed. In the simulations, the entire geometry and components of the neutron guide system are taken into account. The results show a steady-state density in the 10-L trap at the splitter outlet of 340 cm^–3 after the heat exchanger upgrade.

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PIK核反应堆超冷中子源的中子导向系统

研究了基于超流氦的新型超冷中子源在PIK反应堆基础相互作用物理研究中的导中子系统优化问题。在目前的配置中，计划在封闭的变流器室中实现950 cm-3的UCN密度。升级后，将钢制换热器更换为铜制换热器，可使封闭转炉室内UCN密度达到3400 cm-3。对新源进行了蒙特卡罗模拟，以计算封闭变换器腔室和分离器出口的UCN密度，以便将来用户计划在该源进行实验。在模拟中，考虑了中子导导系统的整体几何形状和组成。结果表明：换热器升级后，分离器出口340 cm-3处的10-L疏水阀密度达到稳态；

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来源期刊

Physics of Particles and Nuclei Letters PHYSICS, PARTICLES & FIELDS-

CiteScore

0.80

自引率

20.00%

发文量

108

期刊介绍： The journal Physics of Particles and Nuclei Letters, brief name Particles and Nuclei Letters, publishes the articles with results of the original theoretical, experimental, scientific-technical, methodological and applied research. Subject matter of articles covers: theoretical physics, elementary particle physics, relativistic nuclear physics, nuclear physics and related problems in other branches of physics, neutron physics, condensed matter physics, physics and engineering at low temperatures, physics and engineering of accelerators, physical experimental instruments and methods, physical computation experiments, applied research in these branches of physics and radiology, ecology and nuclear medicine.