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Journal of Low Temperature Physics

, Volume 184, Issue 3–4, pp 845–851 | Cite as

Pulse-Shape Analysis of Ionization Signals in Cryogenic Ge Detectors for Dark Matter

  • N. FoersterEmail author
  • A. Broniatowski
  • K. Eitel
  • S. Marnieros
  • B. Paul
  • M.-C. Piro
  • B. Siebenborn
  • The EDELWEISS Collaboration
Article
  • 139 Downloads

Abstract

The detectors of the direct dark matter search experiment EDELWEISS consist of high-purity germanium crystals operated at cryogenic temperatures (\(\mathrm {{<}20\,mK}\)) and low electric fields (\(\mathrm {{<}1\,V/cm}\)). The surface discrimination is based on the simultaneous measurement of the charge amplitudes on different sets of electrodes. As the rise time of a charge signal strongly depends on the location of an interaction in the crystal, a time-resolved measurement can also be used to identify surface interactions. This contribution presents the results of a study of the discrimination power of the rise time parameter from a hot carrier transport simulation in combination with time-resolved measurements using an EDELWEISS-type detector in a test cryostat at ground level. We show the setup for the time-resolved ionization signal read-out in the EDELWEISS-III experiment and first results from data taking in the underground laboratory of Modane.

Keywords

Dark matter Cryogenic germanium detector Hot carrier transport Pulse-shape analysis Event localization 

Notes

Acknowledgments

N. F. acknowledges funding by the DFG Excellence Initiative through the Karlsruhe School of Elementary Particle and Astroparticle Physics: Science and Technology (KSETA). A.B. thanks KSETA for supporting visits to KIT as KSETA guest scientist. This work has been funded in part by the P2IO LabEx (ANR-10-LABX-0038) in the framework “Investissements d’Avenir” (ANR-11-IDEX-0003-01) managed by the French National Research Agency (ANR).

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • N. Foerster
    • 1
    Email author
  • A. Broniatowski
    • 1
    • 2
  • K. Eitel
    • 3
  • S. Marnieros
    • 2
  • B. Paul
    • 4
  • M.-C. Piro
    • 2
    • 5
  • B. Siebenborn
    • 3
  • The EDELWEISS Collaboration
  1. 1.Institute of Experimental Nuclear Physics (EKP)Karlsruhe Institute of TechnologyKarlsruheGermany
  2. 2.Centre des Sciences Nucléaires et des Sciences de la Matière (IN2P3/CNRS)OrsayFrance
  3. 3.Institute of Nuclear Physics (IKP)Karlsruhe Institute of TechnologyKarlsruheGermany
  4. 4.CEA, Centre d’Etudes Saclay, IRFUGif-sur-Yvette CedexFrance
  5. 5.Department of Physics, Applied Physics and AstronomyRensselaer Polytechnic InstituteTroyUSA

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