Monitoring TES Loop Gain in Frequency Multiplexed Readout

Abstract

We present a method for precise monitoring of the loop gain of transition edge sensors (TES) under electrothermal feedback. The measurement is implemented on the ICE DfMux electronics and operates simultaneously with Digital Active Nulling (DAN). It uses one additional bias sinusoid per TES and does not require any additional readout channels. The loop gain monitor is being implemented on the Simons Array and is an integral part of the baseline calibration strategy for the upcoming LiteBIRD satellite.

References in corpus (5)

• Improved Performance of TES Bolometers using Digital Feedback
• Requirements for future CMB satellite missions: photometric and band-pass response calibration
• Commercially fabricated antenna-coupled Transition Edge Sensor bolometer detectors for next generation Cosmic Microwave Background polarimetry experiment
• Recent Advances in Frequency-Multiplexed TES Readout: Vastly Reduced Parasitics and an Increase in Multiplexing Factor with sub-Kelvin SQUIDs
• ICE: a scalable, low-cost FPGA-based telescope signal processing and networking system