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Characterization of aliased noise in the Advanced ACTPol receiver

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arxiv 1912.02902 v1 pith:GG7J4ONX submitted 2019-12-05 astro-ph.IM

Patricio A. Gallardo , Michael D. Niemack , Jason E. Austermann , James A. Beall , Nick F. Cothard , Cody J. Duell , Shannon M. Duff , Shawn W. Henderson
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Gene C. Hilton Shuay-Pwu Patty Ho Johannes Hubmayr Carl D. Reintsema Maria Salatino Joel Ullom Jeff Van Lanen Michael Vissers Edward J. Wollack
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keywords actpoladvancednoisereceiveraliaseddetectormultiplexingreadout
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abstract

Advanced ACTPol is the second generation polarization-sensitive upgrade to the $6\, \rm m$ aperture Atacama Cosmology Telescope (ACT), which increased detector count and frequency coverage compared to the previous ACTPol receiver. Advanced ACTPol utilizes a new two-stage time-division multiplexing readout architecture based on superconducting quantum interference devices (SQUIDs) to achieve a multiplexing factor as high as 64 (rows), fielding a 2,012 detector camera at 150/220 GHz and two 90/150 GHz cameras containing 1,716 detectors each. In a time domain system, aliasing introduces noise to the readout. In this work we present a figure of merit to measure this noise contribution and present measurements of the aliased noise fraction of the Advanced ACTPol receiver as deployed.

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