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Using SQUIDs to Detect Charge in Cryogenic Germanium Detectors

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Abstract

This paper describes an impedance matching network which allows charge impulses to be measured by a SQUID amplifier with an RMS charge noise of less than 100 e, assuming the SQUID amplifier has a current noise of 2 \(\mathrm{pA}/\sqrt{\mathrm{Hz}}\), and the current pulse has a duration of about 1 μs or shorter. The component values are provided for an example system which has an RMS charge noise of 91 e, assuming all dissipative circuit elements are cooled to a temperature of 100 mK.

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Notes

  1. The input may be approximated by a delta function as long as its frequency spectrum is nearly constant within the bandwidth of the transfer function, T(ω).

References

  1. T.A. Shutt, A dark matter detector based on the simultaneous measurement of phonons and ionization at 20 mK. Dissertation. University of California, Berkeley (1993)

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Acknowledgements

This work was supported in part by the US Department of Energy under grant number DE-FG02-04ER41295 and by the National Science Foundation under grant number PHY-0801712. Robert Moffatt is also thankful for financial support from The Robert and Marvel Kirby Stanford Graduate Fellowship.

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Authors and Affiliations

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

    R. A. Moffatt, B. Cabrera, F. Kadribasic, M. Pyle, D. Wesenberg, J. J. Yen & B. A. Young

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

    B. A. Young

Authors
  1. R. A. Moffatt
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  2. B. Cabrera
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  3. F. Kadribasic
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  4. M. Pyle
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  5. D. Wesenberg
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  6. J. J. Yen
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  7. B. A. Young
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Correspondence to R. A. Moffatt.

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Moffatt, R.A., Cabrera, B., Kadribasic, F. et al. Using SQUIDs to Detect Charge in Cryogenic Germanium Detectors. J Low Temp Phys 167, 638–644 (2012). https://doi.org/10.1007/s10909-012-0593-8

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  • DOI: https://doi.org/10.1007/s10909-012-0593-8

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