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20 April 2024

» arxiv » 1912.2902

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Characterization of aliased noise in the Advanced ACTPol receiver
Patricio A. Gallardo ; Michael D. Niemack ; Jason E. Austermann ; James A. Beall ; Nick F. Cothard ; Cody J. Duell ; Shannon M. Duff ; Shawn W. Henderson ; Gene C. Hilton ; Shuay-Pwu Patty Ho ; Johannes Hubmayr ; Carl D. Reintsema ; Maria Salatino ; Joel Ullom ; Jeff Van Lanen ; Michael Vissers ; Edward J. Wollack ;
Date:	5 Dec 2019
Abstract:	Advanced ACTPol is the second generation polarization-sensitive upgrade to the $6, m m$ 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.
Source:	arXiv, 1912.2902
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