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Publikācija: Modal Analysis of HPGe Detector Assembly in Gamma-ray Spectrometers

Publication Type Scientific article indexed in SCOPUS or WOS database
Funding for basic activity Unknown
Defending: ,
Publication language English (en)
Title in original language Modal Analysis of HPGe Detector Assembly in Gamma-ray Spectrometers
Field of research 2. Engineering and technology
Sub-field of research 2.3 Mechanical engineering
Authors Oļegs Jakovļevs
Vladislavs Malgins
Jānis Vība
Keywords Gamma-ray spectrometers, HPGe detectors, microphonic noise, modal analysis
Abstract The HPGe detector assembly of gamma-ray spectrometer cooled by Stirling cycle cryocooler is under consideration. Modal analysis based on the compiled dynamic model was carried out. The natural frequencies and modes shapes for HPGe detector with relative efficiency 15% mounted by supports made from composite G-Etronax and CESTILENE HD 1000 were calculated by Solidworks simulation. The frequencies of the axial mode are in range of 200-600 Hz where electrical interferences caused by mechanical vibrations (so-called microphone noise) has a large impact on the resolution of spectrometer. It is shown that for cryostat cap the lowest natural frequencies determined by the thickness of input window lay in higher frequency range. The validity of the adopted model was confirmed by the experiments. The calculated natural frequencies of the detector assembly are compared to the harmonics of cryocooler’s vibration. The results obtained are useful to identify the interferences source in electrical circuits of spectrometer at its adjusting.
DOI: 10.21595/vp.2017.19205
Hyperlink: http://www.jvejournals.com/Vibro/article/VP-19205.html 
Reference Jakovļevs, O., Malgins, V., Vība, J. Modal Analysis of HPGe Detector Assembly in Gamma-ray Spectrometers. Vibroengineering PROCEDIA, 2017, Vol.16, pp.61-66. ISSN 2345-0533. Available from: doi:10.21595/vp.2017.19205
Additional information Citation count:
  • Scopus  0
ID 25490