Time evolution of electric fields in CDMS detectors

S. W. Leman*, D. Brandt, P. L. Brink, B. Cabrera, H. Chagani, M. Cherry, P. Cushman, E. Do Couto E Silva, T. Doughty, E. Figueroa-Feliciano, V. Mandic, K. A. McCarthy, N. Mirabolfathi, M. Pyle, A. Reisetter, R. Resch, B. Sadoulet, B. Serfass, K. M. Sundqvist, A. TomadaB. A. Young, J. Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The Cryogenic Dark Matter Search (CDMS) utilizes large mass, 3'' diameter×1'' thick target masses as particle detectors. The target is instrumented with both phonon and ionization sensors, the later providing a ∼1 Vcm-1 electric field in the detector bulk. Cumulative radiation exposure which creates ∼200 × 106 electron-hole pairs could be sufficient to produce a comparable reverse field in the detector thereby degrading the ionization channel performance, if it was not shielded by image charges on the electrodes. To study this, the existing CDMS detector Monte Carlo has been modified to allow for an event by event evolution of the bulk electric field, in three spatial dimensions. Surprisingly, this simple model is not sufficient to explain the degradation of detector performance. Our most recent results and interpretation are discussed.

Original languageEnglish (US)
Pages (from-to)1099-1105
Number of pages7
JournalJournal of Low Temperature Physics
Issue number5-6
StatePublished - Jun 2012


  • Charge transport
  • Cryogenic
  • Dark matter search
  • Germanium

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics


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