Crosstalk Effects in Microwave SQUID Multiplexed TES Bolometer Readout

Groh, John C.; Ahmed, Zeeshan; Henderson, Shawn W.; Hubmayr, Johannes; Mates, John A. B.; Silva-Feaver, Maximiliano; Ullom, Joel; Yu, Cyndia

doi:10.1007/s10909-024-03126-w

Crosstalk Effects in Microwave SQUID Multiplexed TES Bolometer Readout

Journal Article · Sat May 04 00:00:00 EDT 2024 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/s10909-024-03126-w· OSTI ID:2446559

Groh, John C. ^[1]; Ahmed, Zeeshan ^[2]; Henderson, Shawn W. ^[2]; Hubmayr, Johannes ^[3]; Mates, John A. B. ^[3]; Silva-Feaver, Maximiliano ^[4]; Ullom, Joel ^[5]; Yu, Cyndia ^[6]

National Inst. of Standards and Technology (NIST), Boulder, CO (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC
Stanford Univ., CA (United States). Kavli Institute for Particle Astrophysics & Cosmology; SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
Yale Univ., New Haven, CT (United States)
National Inst. of Standards and Technology (NIST), Boulder, CO (United States); Univ. of Colorado, Boulder, CO (United States)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford Univ., CA (United States)

Transition-edge sensor (TES) bolometers are broadly used for background-limited astrophysical measurements from the far-infrared to mm-waves. Many planned future instruments require increasingly large detector arrays, but their scalability is limited by their cryogenic readout electronics. Microwave SQUID multiplexing offers a highly capable scaling solution through the use of inherently broadband circuitry, enabling readout of hundreds to thousands of channels per microwave line. As with any multiplexing technique, the channelization mechanism gives rise to electrical crosstalk which must be understood and controlled so as to not degrade the instrument sensitivity. Here, in this study, we explore implications relevant for TES bolometer array applications, focusing in particular on upcoming mm-wave observatories such as the Simons Observatory and AliCPT. We model the relative contributions of the various underlying crosstalk mechanisms, evaluate the difference between fixed-tone and tone-tracking readout systems, and discuss ways in which crosstalk nonlinearity will complicate on-sky measurements.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 2446559

Journal Information:: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 1-2 Vol. 216; ISSN 0022-2291

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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