Frequency Multiplexed Transition Edge Sensors for Pileup and Background Rejection in CUPID-1T

Digitally frequency multiplexed arrays of transition-edge sensors (TES) have become an effective and established technology for instrumenting large numbers of cryogenic bolometers used in multiple Cosmic Microwave Background telescope experiments. The technique has the benefits of both large resistivity to temperature sensitivity when the TES are held in the transition region by voltage biased electrothermal feedback and the practical utility of frequency multiplexing many TES on a single cable. A future ton-scale implementation of a CUPID-like experiment could make use of this technique for instrumenting the ~1500 necessary light detectors. Applying this technology to a calorimetric measurement for light detection has different constraints than radiant power measurements made by CMB experiments. We will discuss the status of research being done to adopt digital frequency multiplexing to a low-Tc and kHz-bandwidth application viable for pileup and background rejection in a ton-scale version of CUPID.