CCAT Status, Characterization, and Calibration of KID Detector Arrays

The Fred Young Submillimeter Telescope (FYST) for the CCAT Observatory is a six-meter telescope to be situated at an altitude of 5,600 meters in the Atacama Desert. The CCAT facility is currently under construction, with first light expected in early 2026. Prime-Cam, one of the main instruments being developed for FYST, will utilize over 100,000 kinetic inductance detectors (KIDs) and Fabry-Perot interferometers, enabling highly sensitive broadband, polarimetric, and spectroscopic surveys across sub-millimeter to millimeter wavelengths. Coupled with a high-throughput, low-emissivity telescope, Prime-Cam will investigate the Epoch of Reionization, trace galaxy evolution, characterize the cosmic microwave background foreground, and support novel submillimeter time-domain observations. We present a status report on the FYST telescope design and fabrication as well as Prime-Cam instrument development.