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The CCAT-prime project's first light array will be deployed in Mod-Cam, asingle-module testbed and first light cryostat, on the Fred Young SubmillimeterTelescope (FYST) in Chile's high Atacama desert in late 2022. FYST is asix-meter aperture telescope being built on Cerro Chajnantor at an elevation of5600 meters to observe at millimeter and submillimeter wavelengths.1 Mod-Camwill pave the way for Prime-Cam, the primary first generation instrument, whichwill house up to seven instrument modules to simultaneously observe the sky andstudy a diverse set of science goals from monitoring protostars to probingdistant galaxy clusters and characterizing the cosmic microwave background(CMB). At least one feedhorn-coupled array of microwave kinetic inductancedetectors (MKIDs) centered on 280 GHz will be included in Mod-Cam at firstlight, with additional instrument modules to be deployed along with Prime-Camin stages. The first 280 GHz detector array was fabricated by the QuantumSensors Group at NIST in Boulder, CO and includes 3,456 polarization-sensitiveMKIDs. Current mechanical designs allow for up to three hexagonal arrays to beplaced in each single instrument module. We present details on this first lightdetector array, including mechanical designs and cold readout plans, as well asintroducing Mod-Cam as both a testbed and predecessor to Prime-Cam.

CCAT-prime: Designs and status of the first light 280 GHz MKID array and Mod-Cam receiver