Digital Frequency Multiplexed Transition-Edge Sensors for CUPID R&D

Digitally frequency multiplexed arrays of transition-edge sensors leverage the high sensitivity of TES as calorimeters with the scalability of a mature muliplexing scheme. Large arrays using this technique have been deployed for cosmic microwave background measurements and also have potential for background rejection via calorimetry in rare-event searches. A proposed ton-scale neutrinoless double beta decay search using 100Mo, like CUPID-1T, requires <~100 microsecond timing resolution to simultaneously tag alpha backgrounds and resolve two-neutrino double beta decay pileup to probe the neutrino mass hierarchy. We will cover the status of R&D towards applying the dfmux readout scheme to a calorimetric measurement, and how the constraints of a rare-event search affect the noise performance of the readout system in comparison to bolometric measurements.