Measuring the impact ionization and charge trapping probabilities in SuperCDMS HVeV phonon sensing detectors

Ponce, F.; Stanford, C.; Yellin, S.; Page, W. A.; Fink, C. W.; Pyle, M.; Sadoulet, B.; Serfass, B.; Watkins, S. L.; Brink, P. L.; Cherry, M.; Partridge, R.; Cabrera, B.; Kurinsky, Noah; Young, B. A.

doi:10.1103/physrevd.101.031101

Cited by 12 publications

(11 citation statements)

References 8 publications

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“…As an example of the systematic effect on measured Fano factor, we consider here the effect of finite charge collection. In this case, the probability of observing n − k final charges given n initial charges is [49,50]…”

Section: Appendix A: Fano Factor Systematicsmentioning

confidence: 99%

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Ionization yield in silicon for eV-scale electron-recoil processes

Ramanathan

Kurinsky

2020

Phys. Rev. D

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The development of single charge resolving, macroscopic silicon detectors has opened a window into rare processes at the O(eV) scale. In order to reconstruct the energy of a given event, or model the charge signal obtained for a given amount of energy absorbed by the electrons in a detector, an accurate charge yield model is needed. In this paper we review existing measurements of charge yield in silicon, focusing in particular on the region below 1 keV. We highlight a calibration gap between 12-50 eV (referred to as the "UV-gap") and employ a phenomenological model of impact ionization to explore the likely charge yield in this energy regime. Finally, we explore the impact of variations in this model on a test case, that of dark matter scattering off electrons, to illustrate the scientific impact of uncertainties in charge yield.

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Section: Appendix A: Fano Factor Systematicsmentioning

confidence: 99%

“…Ref. [50]), promise to significantly reduce these systematics, and should be able to produce much more accurate measurements of intrinsic Fano factor. In particular, the recent measurement of Ref.…”

Section: Appendix A: Fano Factor Systematicsmentioning

confidence: 99%

Ionization yield in silicon for eV-scale electron-recoil processes

Ramanathan

Kurinsky

2020

Phys. Rev. D

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“…The fill-in between the laser peaks can be explained via both charge trapping and impact ionization as charges propagate across the crystal [34]. In the former case, a charge is trapped in the crystal lattice, reducing the amount of phonon energy produced by shortening the drift length through the crystal.…”

Section: A Small Signal Responsementioning

confidence: 99%

“…The charge trapping and impact ionization probabilities were evaluated for this detector by fitting the laser data with the model described in Ref. [34]. From these fits, we obtain a charge trapping of 12.7% and an impact ionization of 0.6% with the data acquired at TUNL.…”

Section: A Small Signal Responsementioning

confidence: 99%

Design and characterization of a phonon-mediated cryogenic particle detector with an eV-scale threshold and 100 keV-scale dynamic range

Ren¹,

Bathurst²,

Chang³

et al. 2021

Phys. Rev. D

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We present the design and characterization of a cryogenic phonon-sensitive 1-gram Si detector exploiting the Neganov-Trofimov-Luke effect to detect single-charge excitations. This device achieved 2.65(2) eV phonon energy resolution when operated without a voltage bias across the crystal and a corresponding charge resolution of 0.03 electron-hole pairs at 100 V bias. With a continuous-readout data acquisition system and an offline optimum-filter trigger, we obtain a 9.2 eV threshold with a trigger rate of the order of 20 Hz. The detector's energy scale is calibrated up to 120 keVusing an energy estimator based on the pulse area. The high performance of this device allows its application to different fields where excellent energy resolution, low threshold, and large dynamic range are required, including dark matter searches, precision measurements of coherent neutrino-nucleus scattering, and ionization yield measurements.

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“…With the advent of the single-charge sensitive HVeVs, a number of interesting microscopic detector phenomena are able to be studied in new ways. For example, the distribution of events with energy between e/h peaks ("non-quantized" events) allows measurement of impact ionization and trapping probabilities [243]. The ability to differentiate quantized and non-quantized events has also allowed closer study of possible sources of leakage current when HV is applied.…”

Section: Pulse Burstsmentioning

confidence: 99%

Cryogenic Detector Development for SuperCDMS

Mast

2020

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Completing this work has certainly been a journey. Along the way there were triumphs and setbacks, tremendous gains and devastating losses. Many things are quite different now than they were over six years ago when I first found myself a fresh grad student in old Tate hall. The research presented here has all taken place against a backdrop of changing personal, political, and societal conditions. I have only managed to navigate this all due to aid of many people, and I owe each of them my thanks for the influence they have had in my life. Because you are so numerous and I so forgetful, I am certain to neglect some of you, but here goes... First I thank Prisca Cushman and Vuk Mandic who have together steered the course of the SuperCDMS group at UMN. Their scientific, professional, and personal guidance have helped shape me into a better physicist. In particular I thank my advisor Vuk for his calm and insightful manner and superb mentorship. Your steady hand has been a great help and comfort to me at many times, certainly more than I have let show. Thanks also to the post-docs I had the pleasure of working with at UMN, including Hassan Chagani, Matt Fritts, and Anthony Villano. Hassan and Matt, you helped me learn how to operate a dilution fridge with enough confidence to only occasionally wake bolt upright in the middle of the night in fear that I had left some important valve open and lost all the mix! From what I understand now, that is actually a sign of a reasonable level of competence, so thank you! Matt and Anthony, you helped me to learn many of the nuts and bolts of the particular blend of astrophysical, solid state, and experimental particle physics that is DM research. You have also shown through your diligent work and attention to detail how essential, but also how hard it is to produce good, solid, and valuable scientific results. While I am a better researcher for having worked with each of you, more importantly, I value you both as friends.

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Measuring the impact ionization and charge trapping probabilities in SuperCDMS HVeV phonon sensing detectors

Cited by 12 publications

References 8 publications

Ionization yield in silicon for eV-scale electron-recoil processes

Ionization yield in silicon for eV-scale electron-recoil processes

Design and characterization of a phonon-mediated cryogenic particle detector with an eV-scale threshold and 100 keV-scale dynamic range

Cryogenic Detector Development for SuperCDMS

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