Freeform three-mirror anastigmatic large-aperture telescope and receiver optics for CMB-S4

Abstract

CMB-S4, the next-generation ground-based cosmic microwave background (CMB) observatory, will provide detailed maps of the CMB at millimeter wavelengths to dramatically advance our understanding of the origin and evolution of the universe. CMB-S4 will deploy large and small aperture telescopes with hundreds of thousands of detectors to observe the CMB at arcminute and degree resolutions at millimeter wavelengths. Inflationary science benefits from a deep delensing survey at arcminute resolutions capable of observing a large field of view at millimeter wavelengths. This kind of survey acts as a complement to a degree angular resolution survey. The delensing survey requires a nearly uniform distribution of cameras per frequency band across the focal plane. We present a large-throughput, large-aperture (5-meter diameter) freeform three-mirror anastigmatic telescope and an array of 85 cameras for CMB observations at arcminute resolutions, which meets the needs of the delensing survey of CMB-S4. A detailed prescription of this three-mirror telescope and cameras is provided, with a series of numerical calculations that indicate expected optical performance and mechanical tolerance.

References in corpus (6)

• CMB-S4 Science Case, Reference Design, and Project Plan
• Optical Design of the Atacama Cosmology Telescope and the Millimeter Bolometric Array Camera
• The Simons Observatory: Modeling Optical Systematics in the Large Aperture Telescope
• Performance and on-sky optical characterization of the SPTpol instrument
• Fabrication of a Monolithic 5-Meter Aluminum Reflector for Millimeter-Wavelength Observations of the Cosmic Microwave Background
• Sidelobe Modeling and Mitigation for a Three Mirror Anastigmat Cosmic Microwave Background Telescope

Cited by in corpus (5)

• The conceptual design of the 50-meter Atacama Large Aperture Submillimeter Telescope (AtLAST)
• Atacama Large Aperture Submillimeter Telescope (AtLAST) Science: Resolving the Hot and Ionized Universe through the Sunyaev-Zeldovich effect
• The Optical Design Concept for the Atacama Large Aperture Submillimeter Telescope (AtLAST)
• A physical optics characterization of the beam shape and sidelobe levels for the Atacama Large Aperture Submillimeter Telescope (AtLAST)
• The Hydrostatic Mass Bias and the ${\sigma }_8$ Tension: A Multi-Probe Forecast for Stage-IV/V Surveys