@inproceedings{b7a768149a544dab8a6156877053ecde,
title = "Far sidelobe effects from panel gaps of the Atacama Cosmology Telescope",
abstract = "The Atacama Cosmology Telescope is a 6 meter diameter CMB telescope located at 5200 meters in the Chilean desert. ACT has made arc-minute scale maps of the sky at 90 and 150 GHz which have led to precise measurements of the fine angular power spectrum of the CMB fluctuations in temperature and polarization. One of the goals of ACT is to search for the B-mode polarization signal from primordial gravity waves, and thus extending ACT's data analysis to larger angular scales. This goal introduces new challenges in the control of systematic effects, including better understanding of far sidelobe effects that might enter the power spectrum at degree angular scales. Here we study the effects of the gaps between panels of the ACT primary and secondary reflectors in the worst case scenario in which the gaps remain open. We produced numerical simulations of the optics using GRASP up to 8 degrees away from the main beam and simulated timestreams for observations with this beam using real pointing information from ACT data. Maps from these simulated timestreams showed leakage from the sidelobes, indicating that this effect must be taken into consideration at large angular scales.",
keywords = "B-modes, Cosmic Microwave Background, Cosmology, Diffraction, Electromagnetic simulations, Farsidelobes, Optical Simulations, Polarization",
author = "{Flux{\'a} Rojas}, {Pedro Antonio} and Rolando D{\"u}nner and Lo{\"i}c Maurin and Choi, {Steve K.} and Devlin, {Mark J.} and Gallardo, {Patricio A.} and Ho, {Shuay Pwu P.} and Koopman, {Brian J.} and Thibaut Louis and McMahon, {Jeffrey J.} and Federico Nati and Niemack, {Michael D.} and Laura Newburgh and Page, {Lyman A.} and Maria Salatino and Alessandro Schillaci and Schmitt, {Benjamin L.} and Simon, {Sara M.} and Staggs, {Suzanne T.} and Wollack, {Edward J.}",
note = "Publisher Copyright: {\textcopyright} 2016 SPIE.; Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII ; Conference date: 28-06-2016 Through 01-07-2016",
year = "2016",
doi = "10.1117/12.2231421",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Jonas Zmuidzinas and Holland, {Wayne S.}",
booktitle = "Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII",
address = "United States",
}