MEMS measurement of position-dependent characteristics of HVeVs
ORAL
Abstract
We employed a micro-electro-mechanical system (MEMS) mirror-based calibration system to probe open device physics questions about SuperCDMS HVeV detectors with sub-eV phonon resolution. These HVeV devices utilize a parallel array of Quasiparticle-trap-assisted Electro- thermal-feedback Transition-edge sensors (QETs) with high voltage NTL effect amplification to achieve single charge sensitivity. The detector phonon response has been studied extensively; however, difficulties in event position reconstruction leave the problem of detector fiducialization unsolved. At SLAC, we have launched a program using the MEMS-based calibration system capable of programmable cryogenic optical beam steering across the surface of the detector to investigate the underlying spatial dependence of pulse shape, phonon collection efficiency, energy resolution, etc in HVeV detectors. In this talk, I will present the experimental setup and preliminary calibration results. This approach allows for a more complete understanding of the position dependence of detector response, with broad applications to various other superconducting systems, from dark matter experiments' event rejection to qubit characterization.
*This work was supported primarily by Dr. Kelly Stifter's Panofsky Fellowship and by funding from the Army Research Laboratory (ARL). Additional support was provided through the SuperCDMS HVeV program.
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Presenters
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Hope Fu
- Stanford University