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Effects of the mechanical performance and alignment of the Atacama Cosmology Telescope on the sensitivity of microwave observations.

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Title: Effects of the mechanical performance and alignment of the Atacama Cosmology Telescope on the sensitivity of microwave observations.
Author: Burger, Bryce; Hasselfield, Matthew; Halpern, Mark; Amiri, Mandana
Issue Date: 2008
Publicly Available in cIRcle 2011-09-13
Publisher Society of Photo-Optical Instrumentation Engineers
Citation: Hincks, Adam D.; Ade, Peter A. R.; Allen, C.; Amiri, Mandana; Appel, John W.; Battistelli, Elia S.; Burger, Bryce; Chervenak, James A.; Dahlen, Alex J.; Denny, S.; Devlin, Mark J.; Dicker, Simon R.; Doriese, William B.; Dünner, Rolando; Thomas M. Essinger-Hileman, Fisher, Ryan P.; Fowler, Joseph W.; Halpern, Mark; Hargrave, Peter C.; Hasselfield, Matthew; Hilton, Gene C.; Irwin, Kent D.; Jarosik, Norman C.; Kaul, Madhuri; Klein, Jeffery; Lau, Judy M.; Limon, Michele; Lupton, Robert H.; Marriage, Tobias A.; Martocci, Krista L.; Mauskopf, Philip D.; Moseley, S. Harvey; Netterfield, C. Barth; Niemack, Michael D.; Nolta, Michael R.; Page, Lyman A.; Parker, Lucas P.; Audrey J. Sederberg Staggs, Suzanne T.; Stryzak, Omelan R.; Swetz, Daniel S.; Switzer, Eric R.; Thornton, Robert J.; Tucker, Carole E.; Wollack, Edward J.; Zhao, Yue. Effects of the mechanical performance and alignment of the Atacama Cosmology Telescope on the sensitivity of microwave observations. Millimeter and Submillimeter Detectors and Instrumentation for Astronomy IV, edited by William D. Duncan, Wayne S. Holland, Stafford Withington, Jonas Zmuidzinas Proceedings of SPIE Volume 7020, 70201P, 2008. http://dx.doi.org/10.1117/12.790020
Abstract: The Atacama Cosmology Telescope is a six meter, off-axis Gregorian telescope for measuring the cosmic microwave background at arcminute resolutions. The Millimeter Bolometer Array Camera (MBAC) is its current science instrument. Erected in the Atacama Desert of Chile in early 2007, it saw first light with the MBAC on 22 October 2007. In this paper we review its performance after one month of observing, focusing in particular on issues surrounding the alignment of the optical system that impact the sensitivity of the experiment. We discuss the telescope motion, pointing, and susceptibility to thermal distortions. We describe the mirror alignment procedure, which has yielded surface deviations of 31 μm rms on the primary and 10 μm rms on the secondary. Observations of planets show that the optical performance is consistent with the telescope design parameters. Preliminary analysis measures a solid angle of about 215 nanosteradians with a full width at half maximum of 1.44 arcminutes at 145 GHz. Copyright 2008 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited
Affiliation: Physics and Astronomy, Dept of
URI: http://hdl.handle.net/2429/37293
Peer Review Status: Reviewed
Scholarly Level: Faculty

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