Cryogenic phonon-scintillation detectors with PMT readout for rare event search experiments

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• 作者：X. Zhang^a ; J. Lin^a ; V.B. Mikhailik^b ; H. Kraus^a ; ^{h.kraus@physics.ox.ac.uk" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Low-temperature ; Calorimeter ; Photomultiplier ; CaWO4 and CaMoO4
• 刊名：Astroparticle Physics
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：79
• 期：Complete
• 页码：31-40
• 全文大小：2010 K

文摘

Cryogenic phonon–scintillation detectors (CPSD) for rare event search experiments require reliable, efficient and robust photon detectors that can resolve individual photons in a scintillation event. We report on a cryogenic detector containing a scintillating crystal, equipped with an NTD-Ge phonon sensor and a photon detector based on a low-temperature photomultiplier tube (PMT) that is powered by a Cockcroft–Walton generator. Here we present results from the characterisation of two detector modules, one with CaWO₄, the other with CaMoO₄ as scintillator. The energy resolutions (FWHM) at 122.1 keV for the scintillation/PMT channel are 19.9% and 29.7% respectively for CaWO₄ and CaMoO₄ while the energy resolutions (FWHM) for the phonon channels are 2.17 keV (1.8%) and 0.97 keV (0.79%). These characteristics compare favourably with other CPSDs currently used in cryogenic rare-event search experiments. The detection module with PMT readout benefits from the implementation of a well-understood, reliable, and commercially available component and improved time resolution, while retaining the major advantages of conventional CPSD, such as high sensitivity, resolving power and discrimination ability.