Abstract
CCAT-prime is a new 6 m crossed Dragone telescope designed to characterize
the Cosmic Microwave Background (CMB) polarization and foregrounds, measure the
Sunyaev-Zel'dovich effects of galaxy clusters, map the CII emission intensity
from the Epoch of Reionization (EoR), and monitor accretion luminosity over
multi-year timescales of hundreds of protostars in the Milky Way. CCAT-prime
will make observations from a 5,600 m altitude site on Cerro Chajnantor in the
Atacama Desert of northern Chile. The novel optical design of the telescope
combined with high surface accuracy ($<$10 $\mu$m) mirrors and the exceptional
atmospheric conditions of the site will enable sensitive broadband,
polarimetric, and spectroscopic surveys at sub-mm to mm wavelengths. Prime-Cam,
the first light instrument for CCAT-prime, consists of a 1.8 m diameter
cryostat that can house seven individual instrument modules. Each instrument
module, optimized for a specific science goal, will use state-of-the-art
multichroic transition edge sensor (TES) or kinetic inductance detector (KID)
arrays operated at $\sim$100 mK, and Fabry-Perot interferometers (FPI) for the
EoR science. Prime-Cam will be commissioned with staged deployments to populate
the seven instrument modules. The full instrument will consist of 60,000
polarimetric KIDs at a combination of 220/280/350/410 GHz, 12,000 TES
bolometers at 250/350 GHz coupled with FPIs, and 21,000 polarimetric KIDs at
850 GHz. Prime-Cam is currently being developed, and the CCAT-prime telescope
is designed and under construction by Vertex Antennentechnik GmbH to achieve
first light in 2021. CCAT-prime is also a potential telescope platform for the
future CMB Stage-IV observations.
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