CUPID is a next-generation neutrinoless double-beta decay experiment that will require cryogenic light detectors to improve background suppression, via the simultaneous readout of heat and light channels from its scintillating crystals. In this work we showcase light detectors based on a novel Ir-Pt bilayer transition edge sensor. We have performed a systematic study to improve the thermal coupling between the photon absorber and the sensor, and thereby its responsivity. Our first devices meet CUPID's baseline noise requirement of <100~eV rms. Our detectors have risetimes of ∼180 μs and measured timing jitter of <20 μs for the expected signal-to-noise at the Q-value of the decay, which achieves the CUPID's criterion of rejecting two-neutrino double-beta decay pileup events. The current work will inform the fabrication of future devices, culminating in the final TES design and a scaleable readout scheme for CUPID.
@article{arxiv.2210.15619,
title = {Large area photon calorimeter with Ir-Pt bilayer transition-edge sensor for the CUPID experiment},
author = {V. Singh and G. Benato and M. Beretta and C. Capelli and C. L. Chang and B. K. Fujikawa and E. V. Hansen and Yu. G. Kolomensky and WK. Kwok and M. Lisovenko and L. Marini and V. Novosad and J. Pearson and B. Schmidt and K. J. Vetter and G. Wang and B. Welliver and U. Welp and V. Yefremenko and J. Zhang},
journal= {arXiv preprint arXiv:2210.15619},
year = {2022}
}