Thermal and gas flow calculations of low-temperature part of the UCN source at WWR-M reactor

Abstract

Thermal and gas flow calculations of low-temperature part of the UCN source at WWR-M reactor are presented. The calculations were made on the basis of previously developed design documentation. Calculations show that the standard refrigerator Linde TCF-50 is able to maintain the operating temperature of the thermal screens and the condensation of 50 liters of the deuterium premoderapor in the chamber. Calculations of the temperature field of the thermal shield of the low-temperature part of the UCN source were used to select the location of the support structures for a superfluid helium vessel. Based on the above calculations, an estimate of heat inflows at the UCN source chamber was made, which amounted to P = 35 W. The capacity of the vacuum system for pumping helium vapor and helium liquefier is sufficient to maintain 35 liters of the superfluid UCN converter. At present, the UCN source is at the manufacturing stage.

Keywords

• ultracold neutron source
• superfluid helium
• wwr-m reactor