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Proceedings Paper

The effects of the mechanical performance and alignment of the Atacama Cosmology Telescope on the sensitivity of microwave observations
Author(s): A. D. Hincks; P. A. R. Ade; C. Allen; M. Amiri; J. W. Appel; E. S. Battistelli; B. Burger; J. A. Chervenak; A. J. Dahlen; S. Denny; M. J. Devlin; S. R. Dicker; W. B. Doriese; R. Dünner; T. Essinger-Hileman; R. P. Fisher; J. W. Fowler; M. Halpern; P. C. Hargrave; M. Hasselfield; G. C. Hilton; K. D. Irwin; N. Jarosik; M. Kaul; J. Klein; J. M. Lau; M. Limon; R. H. Lupton; T. A. Marriage; K. L. Martocci; P. Mauskopf; S. H. Moseley; C. B. Netterfield; M. D. Niemack; M. R. Nolta; L. Page; L. P. Parker; A. J. Sederberg; S. T. Staggs; O. R. Stryzak; D. S. Swetz; E. R. Switzer; R. J. Thornton; C. Tucker; E. J. Wollack; Y. Zhao
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Paper 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.

Paper Details

Date Published: 19 July 2008
PDF: 10 pages
Proc. SPIE 7020, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy IV, 70201P (19 July 2008); doi: 10.1117/12.790020
Show Author Affiliations
A. D. Hincks, Princeton Univ. (United States)
P. A. R. Ade, Cardiff Univ. (United Kingdom)
C. Allen, NASA Goddard Space Flight Ctr. (United States)
M. Amiri, The Univ. of British Columbia (Canada)
J. W. Appel, Princeton Univ. (United States)
E. S. Battistelli, Univ. of British Columbia (Canada)
Univ. of Rome La Sapienza (Italy)
B. Burger, Univ. of British Columbia (Canada)
J. A. Chervenak, NASA Goddard Space Flight Ctr. (United States)
A. J. Dahlen, Princeton Univ. (United States)
S. Denny, Princeton Univ. (United States)
M. J. Devlin, Univ. of Pennsylvania (United States)
S. R. Dicker, Univ. of Pennsylvania (United States)
W. B. Doriese, National Institute of Standards and Technology (United States)
R. Dünner, Pontificia Univ. Católica de Chile (Chile)
T. Essinger-Hileman, Princeton Univ. (United States)
R. P. Fisher, Princeton Univ. (United States)
J. W. Fowler, Princeton Univ. (United States)
M. Halpern, Univ. of British Columbia (Canada)
P. C. Hargrave, Cardiff Univ. (United Kingdom)
M. Hasselfield, Univ. of British Columbia (Canada)
G. C. Hilton, National Institute of Standards and Technology (United States)
K. D. Irwin, National Institute of Standards and Technology (United States)
N. Jarosik, Princeton Univ. (United States)
M. Kaul, Univ. of Pennsylvania (United States)
J. Klein, Univ. of Pennsylvania (United States)
J. M. Lau, Stanford Univ. (United States)
M. Limon, Columbia Astrophysics Lab. (United States)
R. H. Lupton, Princeton Univ. (United States)
T. A. Marriage, Princeton Univ. (United States)
K. L. Martocci, CUNY (United States)
P. Mauskopf, Cardiff Univ. (United Kingdom)
S. H. Moseley, NASA Goddard Space Flight Ctr. (United States)
C. B. Netterfield, Univ. of Toronto (Canada)
M. D. Niemack, Princeton Univ. (United States)
M. R. Nolta, Canadian Institute for Theoretical Astrophysics, Univ. of Toronto (Canada)
L. Page, Princeton Univ. (United States)
L. P. Parker, Princeton Univ. (United States)
A. J. Sederberg, Princeton Univ. (United States)
S. T. Staggs, Princeton Univ. (United States)
O. R. Stryzak, Princeton Univ. (United States)
D. S. Swetz, Univ. of Pennsylvania (United States)
E. R. Switzer, Princeton Univ. (United States)
R. J. Thornton, Univ. of Pennsylvania (United States)
C. Tucker, Cardiff Univ. (United Kingdom)
E. J. Wollack, NASA Goddard Space Flight Ctr. (United States)
Y. Zhao, Princeton Univ. (United States)


Published in SPIE Proceedings Vol. 7020:
Millimeter and Submillimeter Detectors and Instrumentation for Astronomy IV
William D. Duncan; Wayne S. Holland; Stafford Withington; Jonas Zmuidzinas, Editor(s)

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