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
TL;DR
This paper characterizes aliased noise in the Advanced ACTPol receiver, a sophisticated polarization-sensitive instrument with high detector count and multiplexing, providing a new metric to quantify noise contributions from aliasing.
Contribution
It introduces a figure of merit to measure aliased noise and presents measurements of this noise fraction in the Advanced ACTPol receiver as deployed.
Findings
Aliased noise fraction measured for Advanced ACTPol receiver.
A new figure of merit for quantifying aliased noise.
Quantitative assessment of noise contribution in high multiplexing systems.
Abstract
Advanced ACTPol is the second generation polarization-sensitive upgrade to the 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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