Advanced ACTPol is the second generation polarization-sensitive upgrade to the 6m 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.
@article{arxiv.1912.02902,
title = {Characterization of aliased noise in the Advanced ACTPol receiver},
author = {Patricio A. Gallardo and Michael D. Niemack and Jason E. Austermann and James A. Beall and Nick F. Cothard and Cody J. Duell and Shannon M. Duff and Shawn W. Henderson and Gene C. Hilton and Shuay-Pwu Patty Ho and Johannes Hubmayr and Carl D. Reintsema and Maria Salatino and Joel Ullom and Jeff Van Lanen and Michael Vissers and Edward J. Wollack},
journal= {arXiv preprint arXiv:1912.02902},
year = {2020}
}