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Publikācija: Development and Computational Fluid Dynamics (CFD) Simulation of Cryostat Thermal Shielding for a Portable High Purity Germanium (HPGe) Gamma Spectrometer

Publication Type Scientific article indexed in SCOPUS or WOS database
Funding for basic activity Research project
Defending: ,
Publication language English (en)
Title in original language Development and Computational Fluid Dynamics (CFD) Simulation of Cryostat Thermal Shielding for a Portable High Purity Germanium (HPGe) Gamma Spectrometer
Field of research 2. Engineering and technology
Sub-field of research 2.3 Mechanical engineering
Research platform Materials, Processes, and Technologies
Authors Vladislavs Malgins
Alan Tkaczyk
Oļegs Jakovļevs
Marti Jeltsov
Priit Priimagi
Keywords Computational fluid dynamics, high purity germanium (HPGe), portable gamma spectrometer, thermal shield
Abstract The effect of vacuum degradation in cryostat of a gamma spectrometer on the steady-state temperature of thermal shield and its efficiency are analyzed in this study. Considering the thermal load due to radiation, the thermal conductivity of residual gases and shield supports, the steady-state temperature of the shield is determined based on the differential energy balance equation for a simplified thermal model of the cryostat. A more complex model corresponding to the design of a real cryostat is simulated using computational fluid dynamics. The obtained temperature distribution is presented. The simulated results are compared with experimental data measured on an operating cryostat with a cryocooler in the temperature stabilization mode. The same measurements were carried out for a cryostat with and without a thermal shield, as well as with multilayer insulation. The obtained results confirm that the thermal shield provides decreasing heat transfer even for a vacuum degradation in a cryostat.
DOI: 10.1080/10739149.2020.1715424
Hyperlink: https://www.tandfonline.com/doi/full/10.1080/10739149.2020.1715424 
Reference Malgins, V., Tkaczyk, A., Jakovļevs, O., Jeltsov, M., Priimagi, P. Development and Computational Fluid Dynamics (CFD) Simulation of Cryostat Thermal Shielding for a Portable High Purity Germanium (HPGe) Gamma Spectrometer. Instrumentation Science & Technology, 2020, Vol. 48, No. 1, pp.1-17. ISSN 1073-9149. e-ISSN 1525-6030. Available from: doi:10.1080/10739149.2020.1715424
Additional information Citation count:
  • Scopus  0
ID 30712