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Cold optical design for the large aperture Simons' Observatory telescope

Spyromilio, Jason, Marshall, Heather K., Gilmozzi, Roberto, Vavagiakis, Eve M., Ullom, Joel N., Thornton, Robert, Staggs, Suzanne T., Simon, Sara M., Salatino, Maria, Piccirillo, Lucio, Orlowski-Scherer, John L., Niemack, Michael D., Ho, Shuay-Pwu P., Galitzki, Nicholas, Devlin, Mark J., Coppi, Gabriele, Ashton, Peter, Ali, Aamir, Mauskopf, Phillip, Gudmudsson, Jon E., Gallardo, Patricio A., Zhu, Ningfeng, Xu, Zhilei, Wollack, Edward J., McMahon, Jeff, Matsuda, Frederick, Limon, Michele, Lee, Adrian T., Keating, Brian, Hubmayr, Johannes, Hill, Charles A. and Dicker, Simon R. 2018. Cold optical design for the large aperture Simons' Observatory telescope. Presented at: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, TX, USA, 10-15 June 2018. Ground-based and Airborne Telescopes VII. SPIE, p. 122. 10.1117/12.2313444

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The Simons Observatory will consist of a single large (6 m diameter) telescope and a number of smaller (∼0.5 m diameter) refracting telescopes designed to measure the polarization of the Cosmic Microwave Background to unprecedented accuracy. The large aperture telescope is the same design as the CCAT-prime telescope, a modified Crossed Dragone design with a field-of-view of over 7.8 degrees diameter at 90 GHz. This paper presents an overview of the cold reimaging optics for this telescope and what drove our choice of 350–400 mm diameter silicon lenses in a 2.4 m cryostat over other possibilities. We will also consider the future expandability of this design to CMB Stage-4 and beyond.

Item Type: Conference or Workshop Item (Paper)
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Publisher: SPIE
Date of First Compliant Deposit: 24 August 2018
Last Modified: 06 Aug 2019 15:58

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