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The optical design of the six-meter CCAT-prime and Simons Observatory telescopes
Author(s): Stephen C. Parshley; Michael Niemack; Richard Hills; Simon R. Dicker; Rolando Dünner; Jens Erler; Patricio A. Gallardo; Jon E. Gudmundsson; Terry Herter; Brian J. Koopman; Michele Limon; Frederick T. Matsuda; Philip Mauskopf; Dominik A. Riechers; Gordon J. Stacey; Eve M. Vavagiakis
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Paper Abstract

A common optical design for a coma-corrected, 6-meter aperture, crossed-Dragone telescope has been adopted for the CCAT-prime telescope of CCAT Observatory, Inc., and for the Large Aperture Telescope of the Simons Observatory. Both are to be built in the high altitude Atacama Desert in Chile for submillimeter and millimeter wavelength observations, respectively. The design delivers a high throughput, relatively flat focal plane, with a field of view 7.8 degrees in diameter for 3 mm wavelengths, and the ability to illuminate >100k diffraction-limited beams for < 1 mm wavelengths. The optics consist of offset reflecting primary and secondary surfaces arranged in such a way as to satisfy the Mizuguchi-Dragone criterion, suppressing first-order astigmatism and maintaining high polarization purity. The surface shapes are perturbed from their standard conic forms in order to correct coma aberrations. We discuss the optical design, performance, and tolerancing sensitivity. More information about CCAT-prime can be found at and about Simons Observatory at

Paper Details

Date Published: 6 July 2018
PDF: 13 pages
Proc. SPIE 10700, Ground-based and Airborne Telescopes VII, 1070041 (6 July 2018); doi: 10.1117/12.2314073
Show Author Affiliations
Stephen C. Parshley, Cornell Univ. (United States)
Michael Niemack, Cornell Univ. (United States)
Richard Hills, Univ. of Cambridge (United Kingdom)
Simon R. Dicker, Univ. of Pennsylvania (United States)
Rolando Dünner, Pontificia Univ. Católica de Chile (Chile)
Jens Erler, Rheinische Friedrich-Wilhelms-Univ. Bonn (Germany)
Patricio A. Gallardo, Cornell Univ. (United States)
Jon E. Gudmundsson, Stockholm Univ. (Sweden)
Terry Herter, Cornell Univ. (United States)
Brian J. Koopman, Cornell Univ. (United States)
Michele Limon, Univ. of Pennsylvania (United States)
Frederick T. Matsuda, The Univ. of Tokyo (Japan)
Philip Mauskopf, Arizona State Univ. (United States)
Dominik A. Riechers, Cornell Univ. (United States)
Gordon J. Stacey, Cornell Univ. (United States)
Eve M. Vavagiakis, Cornell Univ. (United States)

Published in SPIE Proceedings Vol. 10700:
Ground-based and Airborne Telescopes VII
Heather K. Marshall; Jason Spyromilio; Roberto Gilmozzi, Editor(s)

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