The SuperCDMS HVeV Program: Progress and Results from HVeV@CUTE

by Kyle Kennard

Friday 7 Nov 2025, 11:30 → 13:00 America/New_York

 

Abstract: 

The SuperCDMS-HVeV (High-Voltage with eV resolution) program is an R&D project focused on developing detectors with excellent energy resolution to search for low-mass dark matter (< 1 GeV/c2), study charge-transport in cryogenically-cooled crystals, and probe unclassified backgrounds at low energy. The program utilizes gram-scale silicon detectors instrumented with TES (transition-edge sensor)-based phonon sensors. A high-voltage bias can be applied to the crystal to amplify phonon signals from ionizing interactions via the Neganov-Trofimov-Luke effect. Utilizing these tools, HVeV detectors have recently achieved sub-eV baseline energy resolutions and demonstrated competitive sensitivities to electron-recoil dark matter at masses below 1 MeV/c2. This talk will provide an overview of recent developments within the HVeV program. In particular, I will present preliminary results from a data-taking campaign conducted at the CUTE facility at SNOLAB using an HVeV detector with a sub-eV baseline resolution. Included in these results are observations of the Low Energy Excess and progress on an electron-recoil dark matter search.