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Experimental Characterization of Space Charge in IZIP Detectors

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Abstract

Interleaved ionization electrode geometries offer the possibility of efficient rejection of near-surface events. The CDMS collaboration has implemented this interleaved approach for the charge and phonon readout for our germanium detectors. During a recent engineering run with negligible ambient radiation, the detectors were found to lose ionization stability more quickly than expected. This paper summarizes studies done in order to determine the underlying cause of the instability, as well as possible running modes that maintain stability without unacceptable loss of livetime. Additionally, first results are shown for the new version IZIP mask which attempts to improve the overall stability of the detectors.

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Acknowledgements

This work is supported by the United States Department of Energy grant DE-AC02-76SF00515 and the United States National Science Foundation awards 0705052, 0902182, 1004714, and 0802575.

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Authors and Affiliations

  1. University of California at Berkeley, Berkeley, CA, 94720, USA

    T. Doughty, N. Mirabolfathi, B. Serfass & B. Sadoulet

  2. Stanford University, Palo Alto, CA, 94305, USA

    M. Pyle & B. Cabrera

  3. Queen’s University, Kingston, Ontario, Canada

    O. Kamaev

  4. Massachusett’s Institute of Technology, Cambridge, MA, 02139, USA

    S. Hertel & S. W. Leman

  5. SLAC National Accelerator Laboratory, Menlo Park, CA, 94309, USA

    P. Brink

Authors
  1. T. Doughty
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  2. M. Pyle
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  3. N. Mirabolfathi
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  4. B. Serfass
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  5. O. Kamaev
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  6. S. Hertel
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  7. S. W. Leman
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  8. P. Brink
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  9. B. Cabrera
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  10. B. Sadoulet
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Corresponding author

Correspondence to T. Doughty.

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For the SuperCDMS Collaboration.

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Doughty, T., Pyle, M., Mirabolfathi, N. et al. Experimental Characterization of Space Charge in IZIP Detectors. J Low Temp Phys 167, 1087–1092 (2012). https://doi.org/10.1007/s10909-012-0587-6

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  • DOI: https://doi.org/10.1007/s10909-012-0587-6

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