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Time Evolution of Electric Fields in CDMS Detectors

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Abstract

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 V cm−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.

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Acknowledgements

This work is supported in part by the United States National Science Foundation (under Grant Nos. PHY-0847342, 0705052 , 0902182 and 1004714) and the United States Department of Energy (under contract DE-AC02-76SF00515).

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Authors and Affiliations

  1. Kavli Institute, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA

    S. W. Leman, E. Figueroa-Feliciano & K. A. McCarthy

  2. SLAC National Accelerator Laboratory/KIPAC, Menlo Park, CA, 94025, USA

    D. Brandt, P. L. Brink, E. Do Couto E Silva, R. Resch & A. Tomada

  3. Department of Physics, Stanford University, Stanford, CA, 94305, USA

    B. Cabrera, M. Cherry & M. Pyle

  4. School of Physics & Astronomy, University of Minnesota, Minneapolis, MN, 55455, USA

    H. Chagani, P. Cushman, V. Mandic & J. Zhang

  5. Department of Physics, The University of California at Berkeley, Berkeley, CA, 94720, USA

    T. Doughty, N. Mirabolfathi, B. Sadoulet, B. Serfass & K. M. Sundqvist

  6. Department of Physics, St. Olaf College, Northfield, MN, 55057, USA

    A. Reisetter

  7. Department of Physics, Santa Clara University, Santa Clara, CA, 95053, USA

    B. A. Young

Authors
  1. S. W. Leman
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  2. D. Brandt
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  3. P. L. Brink
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  4. B. Cabrera
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  5. H. Chagani
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  6. M. Cherry
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  7. P. Cushman
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  8. E. Do Couto E Silva
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  9. T. Doughty
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  10. E. Figueroa-Feliciano
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  11. V. Mandic
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  12. K. A. McCarthy
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  13. N. Mirabolfathi
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  14. M. Pyle
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  15. A. Reisetter
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  16. R. Resch
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  17. B. Sadoulet
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  18. B. Serfass
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  19. K. M. Sundqvist
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  20. A. Tomada
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  21. B. A. Young
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  22. J. Zhang
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Corresponding author

Correspondence to S. W. Leman.

Additional information

On behalf of the Cryogenic Dark Matter Search collaboration.

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Leman, S.W., Brandt, D., Brink, P.L. et al. Time Evolution of Electric Fields in CDMS Detectors. J Low Temp Phys 167, 1099–1105 (2012). https://doi.org/10.1007/s10909-012-0465-2

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  • DOI: https://doi.org/10.1007/s10909-012-0465-2

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