학술논문
Freeform three-mirror anastigmatic large-aperture telescope and receiver optics for CMB-S4
Document Type
Working Paper
Author
Gallardo, Patricio A.; Puddu, Roberto; Harrington, Kathleen; Benson, Bradford; Carlstrom, John; Dicker, Simon R.; Emerson, Nick; Gudmundsson, Jon E.; Limon, Michele; McMahon, Jeff; Nagy, Johanna M.; Natoli, Tyler; Niemack, Michael D.; Padin, Stephen; Ruhl, John; Simon, Sara M.; collaboration, the CMB-S4
Source
Subject
Language
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.