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

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 ccatobservatory.org and about Simons Observatory at simonsobservatory.org.

arXiv commentEvent: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, USA; Proceedings Volume 10700, Ground-based and Airborne Telescopes VII; 1070041 (2018)

References in corpus (5)

• Optical Design of the Atacama Cosmology Telescope and the Millimeter Bolometric Array Camera
• The Cosmology Large Angular Scale Surveyor (CLASS): 40 GHz optical design
• Submillimeter Atmospheric Transparency at Maunakea, at the South Pole, and at Chajnantor
• Designs for a large-aperture telescope to map the CMB 10X faster
• Studies of Systematic Uncertainties for Simons Observatory: Optical Effects and Sensitivity Considerations

Cited by in corpus (21)

• The Simons Observatory: Science goals and forecasts
• CMB-S4 Science Case, Reference Design, and Project Plan
• CCAT-prime Collaboration: Science Goals and Forecasts with Prime-Cam on the Fred Young Submillimeter Telescope
• The Simons Observatory: Astro2020 Decadal Project Whitepaper
• The Simons Observatory Large Aperture Telescope Receiver
• The Simons Observatory: Modeling Optical Systematics in the Large Aperture Telescope
• Progress in the Design of the Atacama Large Aperture Submillimeter Telescope
• Cosmology from weak lensing, galaxy clustering, CMB lensing and tSZ: I. 10x2pt Modelling Methodology
• Full-sky beam convolution for cosmic microwave background applications
• The Simons Observatory: A fully remote controlled calibration system with a sparse wire grid for cosmic microwave background telescopes
• Optical modeling of systematic uncertainties in detector polarization angles for the Atacama Cosmology Telescope
• The Simons Observatory: Characterizing the Large Aperture Telescope Receiver with Radio Holography
• Freeform three-mirror anastigmatic large-aperture telescope and receiver optics for CMB-S4
• The Simons Observatory: Project Overview
• Geometrical and physical optics analysis for mm-wavelength refractor telescopes designed to map the cosmic microwave background
• Cold optical design for the Large Aperture Simons Observatory telescope
• The Simons Observatory: Dark Characterization of the Large Aperture Telescope
• The Atacama Cosmology Telescope: Systematic Transient Search of Single Observation Maps
• Modified crossed Dragone optical design of the LiteBIRD low-frequency telescope
• The Simons Observatory: HoloSim-ML: machine learning applied to the efficient analysis of radio holography measurements of complex optical systems
• Wide Field High Cadence CMB Survey Designs for Chilean Telescopes