Study of dark counts in optical superconducting transition-edge sensors
arxiv(2024)
Abstract
Superconducting transition-edge sensors (TESs), known for their high
single-photon detection efficiency and low background, are increasingly being
used in rare event searches. We present the first comprehensive
characterization of optical TES backgrounds, identifying three event types:
high-energy, electrical noise, and photon-like. We experimentally verify and
simulate the source of high-energy events in optical TESs. We develop methods
to isolate photon-like events, the expected signal in dark matter searches,
achieving record-low photon-like dark count rates in the 0.8-3.2 eV energy
range.
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