Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session Y14: Detector R&D III
1:30 PM–3:18 PM,
Tuesday, April 16, 2019
Sheraton
Room: Plaza Court 3
Sponsoring
Unit:
DPF
Chair: Young-Kee Kim
Abstract: Y14.00009 : Impact Ionization in SuperCDMS HVeV Detectors
3:06 PM–3:18 PM
View Presentation Abstract
Presenter:
Francisco Ponce
(Stanford University)
Authors:
Francisco Ponce
(Stanford University)
Paul Brink
(SLAC National Accelerator Laboratory)
Blas Cabrera
(Stanford University)
Matthew A. Cherry
(SLAC National Accelerator Laboratory)
Caleb Fink
(University of California, Berkeley)
Noah Kurinsky
(Stanford University)
William Page
(University of California, Berkeley)
Richard Allan Partridge
(SLAC National Accelerator Laboratory)
Matt Pyle
(University of California, Berkeley)
Bernard Sadoulet
(University of California, Berkeley)
Bruno Christian Serfass
(University of California, Berkeley)
Chris C Stanford
(Stanford University)
Samuel Watkins
(University of California, Berkeley)
Steven J. Yellin
(Stanford University)
Betty Young
(Santa Clara University)
The existence of Dark Matter (DM) is supported by astronomical data and observations; however, to date there is no confirmed direct detection of DM. The SuperCDMS collaboration has expanded its capabilities with the development of the prototype HVeV detector. The HVeV detector uses a high voltage applied across the Si (or Ge) crystal to accelerate charges, which scatter off the crystal lattice generating additional phonons via the Neganov-Trofimov-Luke (NTL) effect. The total energy of the generated phonons is equal to the number of e-h+ pairs times the applied voltage, thus the detector response is quantized from the discrete e-h+ pair production. Unfortunately, the accelerated charges can (with some probability) free other loosely bound charges throughout the crystal, referred to as impact ionization. The observed energy from events that undergo impact ionization will not be quantized due to an incomplete NTL effect on the freed charges. These types of events will lie between the quantized peaks and appear as a flat high energy background. Here we discuss a technique for studying the effect of impact ionization on the SuperCDMS HVeV detector using a pulsed laser at ultra-low intensity.
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