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Current large-aperture cosmic microwave background (CMB) telescopes havenearly maximized the number of detectors that can be illuminated whilemaintaining diffraction-limited image quality. The polarization-sensitivedetector arrays being deployed in these telescopes in the next few years willhave roughly $10^4$ detectors. Increasing the mapping speed of futureinstruments by at least an order of magnitude is important to enable preciseprobes of the inflationary paradigm in the first fraction of a second after thebig bang and provide strong constraints on cosmological parameters. The CMBcommunity has begun planning a next generation "Stage IV" CMB project that willbe comprised of multiple telescopes with between $10^5$ - $10^6$ detectors topursue these goals. This paper introduces new crossed Dragone telescope andreceiver optics designs that increase the usable diffraction-limitedfield-of-view, and therefore the mapping speed, by an order of magnitudecompared to the upcoming generation of large-aperture instruments. Polarizationsystematics and engineering considerations are presented, including apreliminary receiver model to demonstrate that these designs will enable highefficiency illumination of $>10^5$ detectors in a next generation CMBtelescope.

Designs for a large-aperture telescope to map the CMB 10X faster