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Mod-Cam is a first light and commissioning instrument for the CCAT-primeproject's six-meter aperture Fred Young Submillimeter Telescope (FYST),currently under construction at 5600 m on Cerro Chajnantor in Chile's AtacamaDesert. Prime-Cam, a first-generation science instrument for FYST, will deliverover ten times greater mapping speed than current and near-term facilities forunprecedented 280-850 GHz broadband and spectroscopic measurements withmicrowave kinetic inductance detectors (MKIDs). CCAT-prime will address a suiteof science goals, from Big Bang cosmology to star formation and galaxyevolution over cosmic time. Mod-Cam deployment on FYST with a 280 GHzinstrument module containing MKID arrays is planned for early scienceobservations in 2024. Mod-Cam will be used to test instrument modules forPrime-Cam, which can house up to seven instrument modules. We discuss thedesign and status of the 0.9 m diameter, 1.8 m long Mod-Cam receiver and 40 cmdiameter 280 GHz instrument module, with cold stages at 40 K, 4 K, 1 K, and 100mK. We also describe the instrument module's cryogenic readout designs toenable the readout of more than 10,000 MKIDs across 18 networks.

CCAT-prime: Design of the Mod-Cam receiver and 280 GHz MKID instrument module