Abstract
High-purity germanium (HPGe) is a vibration-sensitive, high-resolution detector. It has been found that microphonic noise induced by vibration and electromagnetic interference from EMC causes energy resolution degradation in HPGe detectors. In this paper, to enhance the energy resolution of a pulse tube-cooled high purity germanium detector, a passive vibration isolation system for the portable pulse tube cooler (PTC) was employed and investigated. In order to evaluate the performance of the vibration isolation system, micro-vibration tests of the compressor with a vibration isolation kit and detector mounting interface were performed. Meanwhile, detector energy resolution and detector signal noise were tested, respectively, under the PTC, with the isolation system switched to either an on or off condition. The test results indicate that the effectiveness of passive vibration isolation techniques is confirmed, and no degradation was induced by PTC vibration on detector energy resolution.
Highlights
High-purity germanium (HPGe) detectors are the laboratory standard for high-resolution gamma-ray spectroscopy and are used extensively in a wide range of application areas, such as environmental monitoring, medicine, geology and scientific research [1]
In order to reduce the leakage of current-induced noise from thermal generation of charge carriers, HPGe detectors need to operate at a temperature range of 90~120 K
Mechanical vibrations inherent in EMC cause electrical noise induced at the preamplifier input and periodic changes of structural capacitances between the HPGe detector and components
Summary
HPGe detectors are the laboratory standard for high-resolution gamma-ray spectroscopy and are used extensively in a wide range of application areas, such as environmental monitoring, medicine, geology and scientific research [1]. In order to reduce the leakage of current-induced noise from thermal generation of charge carriers, HPGe detectors need to operate at a temperature range of 90~120 K. To achieve these temperatures, liquid nitrogen (LN2), a cryogen, was commonly used with a cryostat. Mechanical vibrations inherent in EMC cause electrical noise induced at the preamplifier input and periodic changes of structural capacitances between the HPGe detector and components. Riabzev et al [5] developed the ultra-low vibration cryogenic cooler by. Riabzev et al [5] developed the ultra-low vibration cryogenic cooler by utiuoltftihzitleihinzetgientceaghcncahoinqcmiouqmbeusienbisiasntiiasmotmniaoianoniflnoyplfyarpesrafselsiflevsceietvcetaedenaddinnidnatchatthcievetieavaxesxiuaisalpulpdpdripirererseecscstitiosioiononnntoeotfcfehtctnhhhieenqicucqooeuoose.lleesT.rr.h.TReRhiieeaafbbfeezzffceeetvvicvteeietvtnaeaelnsl..es[s6[o6s]f] pprrooppoosseeddaammuullttiiddiimmeennssiioonnaall,, ttrriippllee--ssttaaggee,, ppaassssiivvee vviibbrraattiioonn iissoollaattoorroonntthheeccooldldtitpipoof fa asmsmalalllcrcyryogoegneinciccocooloelre.rT. The results indicate that the passive isolation method can meet HPGe detector requirements
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