Development of cryogenic light detectors with Neganov-Trofimov-Luke amplification for CUPID

The next-generation experiment CUPID (CUORE Upgrade with Particle IDentification) will search for the ¹⁰⁰Mo neutrinoless double beta decay (0ν2β) using enriched Li₂MoO₄ scintillating bolometers facing thin Ge cryogenic light detectors. The dual heat-light readout allows for the discrimination of α particles, an important background source in CUORE, CUPID’s predecessor, and improves the experimental sensitivity. In addition, the Ge light detectors will be equipped with Al electrodes to amplify their signal-to-noise ratio through the so-called Neganov-Trofimov-Luke (NTL) effect. The NTL technology will be the key to rejecting the pileup of ¹⁰⁰Mo two-neutrino double beta decay (2ν2β), a significant background to the 0ν2β search due to the relatively fast 2ν2β decay rate of ¹⁰⁰Mo. Currently, various developments are being pursued within the collaboration to obtain the best performance from these NTL light detectors and a reliable production process. The presentation will focus on the status of these activities, mainly focused on the study of NTL light detector production and the maximization of the production success rate.