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Proceedings Paper

Far sidelobe effects from panel gaps of the Atacama Cosmology Telescope
Author(s): Pedro Antonio Fluxa Rojas; Rolando Dünner; Loïc Maurin; Steve K. Choi; Mark J. Devlin; Patricio A. Gallardo; Shuay-Pwu P. Ho; Brian J. Koopman; Thibaut Louis; Jeffrey J. McMahon; Federico Nati; Michael D. Niemack; Laura Newburgh; Lyman A. Page; Maria Salatino; Alessandro Schillaci; Benjamin L. Schmitt; Sara M. Simon; Suzanne T. Staggs; Edward J. Wollack
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Paper 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.

Paper Details

Date Published: 19 July 2016
PDF: 11 pages
Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 99142Q (19 July 2016); doi: 10.1117/12.2231421
Show Author Affiliations
Pedro Antonio Fluxa Rojas, Pontificia Univ. Católica de Chile (Chile)
Rolando Dünner, Pontificia Univ. Católica de Chile (Chile)
Loïc Maurin, Pontificia Univ. Catolica de Chile (Chile)
Steve K. Choi, Princeton Univ. (United States)
Mark J. Devlin, Univ. of Pennsylvania (United States)
Patricio A. Gallardo, Cornell Univ. (United States)
Shuay-Pwu P. Ho, Princeton Univ. (United States)
Brian J. Koopman, Cornell Univ. (United States)
Thibaut Louis, Univ. of Oxford (United Kingdom)
Jeffrey J. McMahon, Univ. of Michigan Ann Arbor (United States)
Federico Nati, Univ. of Pennsylvania (United States)
Michael D. Niemack, Cornell Univ. (United States)
Laura Newburgh, Univ. of Toronto (Canada)
Lyman A. Page, Princeton Univ. (United States)
Maria Salatino, Princeton Univ. (United States)
Alessandro Schillaci, Pontificia Univ. Catolica de Chile (Chile)
Benjamin L. Schmitt, Univ. of Pennsylvania (United States)
Sara M. Simon, Princeton Univ. (United States)
Suzanne T. Staggs, Princeton Univ. (United States)
Edward J. Wollack, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 9914:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII
Wayne S. Holland; Jonas Zmuidzinas, Editor(s)

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