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CCAT-prime will be a 6-meter aperture telescope operating from sub-mm to mmwavelengths, located at 5600 meters elevation on Cerro Chajnantor in theAtacama Desert in Chile. Its novel crossed-Dragone optical design will delivera high throughput, wide field of view capable of illuminating much largerarrays of sub-mm and mm detectors than can existing telescopes. We present anoverview of the motivation and design of Prime-Cam, a first-light instrumentfor CCAT-prime. Prime-Cam will house seven instrument modules in a 1.8 meterdiameter cryostat, cooled by a dilution refrigerator. The optical elements willconsist of silicon lenses, and the instrument modules can be individuallyoptimized for particular science goals. The current design enables bothbroadband, dual-polarization measurements and narrow-band, Fabry-Perotspectroscopic imaging using multichroic transition-edge sensor (TES) bolometersoperating between 190 and 450 GHz. It also includes broadband kinetic inductiondetectors (KIDs) operating at 860 GHz. This wide range of frequencies willallow excellent characterization and removal of galactic foregrounds, whichwill enable precision measurements of the sub-mm and mm sky. Prime-Cam will beused to constrain cosmology via the Sunyaev-Zeldovich effects, map theintensity of [CII] 158 $\mu$m emission from the Epoch of Reionization, measureCosmic Microwave Background polarization and foregrounds, and characterize thestar formation history over a wide range of redshifts. More information aboutCCAT-prime can be found at www.ccatobservatory.org.

Prime-Cam: A first-light instrument for the CCAT-prime telescope