Light detector development for CRESST II

F. Petricca, G. Angloher, C. Cozzini, T. Frank, D. Hauff, J. Ninković, F. Pröbst, W. Seidel, S. Uchaikin

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

CRESST-II detector modules rely on the ability to actively discriminate electron recoils from nuclear recoils via simultaneous measurement of phonons and scintillation light. The scintillation light produced in each target crystal is detected via an associated calorimeter consisting of a thin silicon wafer read out by a tungsten phase transition thermometer deposited on its surface. About 1% of the energy deposited in CaWO4 is detected as scintillation light; therefore, the sensitivity of the light detector is crucial for the discrimination of electron recoils from nuclear recoils at energies relevant for WIMP searches. We report the detector performance obtained using a thermometer geometry characterized by phonon collectors and a thin film thermal coupling to the heat sink (Fig. 1). This concept allows a high sensitivity by decoupling the area required for the collection of non-thermal phonons and the heat capacity of the sensor. With a 30×30×0.45mm3 light detector, energy thresholds below 5keV referred to energy deposition in CaWO4 have been obtained. Results achieved will be presented and an overview on further possibilities of development will be given.

Original languageEnglish
Pages (from-to)193-196
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume520
Issue number1-3
DOIs
Publication statusPublished - 11 Mar 2004

Keywords

  • CaWO
  • Dark matter
  • Light detector
  • Phonon collectors
  • Scintillation light

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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