In-flight gain monitoring of SPIDER's transition-edge sensor arrays
J. P. Filippini, A. E. Gambrel, A. S. Rahlin, E. Y. Young, P. A. R., Ade, M. Amiri, S. J. Benton, A. S. Bergman, R. Bihary, J. J. Bock, J. R., Bond, J. A. Bonetti, S. A. Bryan, H. C. Chiang, C. R. Contaldi, O. Dore, A., J. Duivenvoorden, H. K. Eriksen, M. Farhang, A. A. Fraisse
TL;DR
This paper introduces a non-intrusive, sensitive method for monitoring gain variations in TES arrays using small bias square waves, validated with SPIDER flight data, to improve observational efficiency in space and balloon experiments.
Contribution
A novel method for real-time TES gain monitoring using electrical response estimators, suitable for limited observing time and bandwidth scenarios.
Findings
Validated with SPIDER flight data
Effective in detecting gain variations
Applicable to future space-based instruments
Abstract
Experiments deploying large arrays of transition-edge sensors (TESs) often require a robust method to monitor gain variations with minimal loss of observing time. We propose a sensitive and non-intrusive method for monitoring variations in TES responsivity using small square waves applied to the TES bias. We construct an estimator for a TES's small-signal power response from its electrical response that is exact in the limit of strong electrothermal feedback. We discuss the application and validation of this method using flight data from SPIDER, a balloon-borne telescope that observes the polarization of the cosmic microwave background with more than 2000 TESs. This method may prove useful for future balloon- and space-based instruments, where observing time and ground control bandwidth are limited.
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