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The optical design of the six-meter CCAT-prime and Simons Observatory telescopes

Spyromilio, Jason, Marshall, Heather K., Gilmozzi, Roberto, Vavagiakis, Eve M., Stacey, Gordon J., Riechers, Dominik A., Mauskopf, Philip, Matsuda, Frederick T., Limon, Michele, Koopman, Brian J., Herter, Terry, Gudmundsson, Jon E., Gallardo, Patricio A., Erler, Jens, Dunner, Rolando, Dicker, Simon R., Hills, Richard, Niemack, Michael D. and Parshley, Stephen C. 2018. The optical design of the six-meter CCAT-prime and Simons Observatory telescopes. Presented at: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, TX, USA, 10-15 June 2018. Proceedings Volume 10700, Ground-based and Airborne Telescopes VII; 1070041 (2018). p. 145. 10.1117/12.2314073
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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

Item Type: Conference or Workshop Item (Paper)
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Date of First Compliant Deposit: 24 August 2018
Date of Acceptance: 6 July 2018
Last Modified: 11 Sep 2018 14:44

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