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.
@article{arxiv.1808.05058,
title = {Cold optical design for the Large Aperture Simons Observatory telescope},
author = {S. R. Dicker and P. A. Gallardo and J. E Gudmundsson and P. D. Mauskopf and A. Ali and P. C. Ashton and G. Coppi and M. J. Devlin and N. Galitzki and S. P. Ho and C. A. Hill and J. Hubmayr and B. Keating and A. T. Lee and M. Limon and F. Matsuda and J. McMahon and M. D. Niemack and J. L. Orlowski-Scherer and L. Piccirillo and M. Salatino and S. M. Simon and S. T. Staggs and R. Thornton and J. N. Ullom and E. M. Vavagiakis and E. J. Wollack and Z. Xu and N. Zhu},
journal= {arXiv preprint arXiv:1808.05058},
year = {2019}
}