Pair Production and Hadron Photoproduction Backgrounds at the Cool Copper Collider

Electron-positron pair production and hadron photoproduction are the most important beam-induced backgrounds at linear electron-positron colliders. Predicting them accurately governs the design and optimization of detectors at these machines and, ultimately, their physics reach. With the proposal, adoption, and first specification of the C3 collider concept, it is of primary importance to estimate these backgrounds and begin the process of tuning existing linear collider detector designs to exploit the parameters of the machine fully. We will report on the status of estimating both of these backgrounds at C3 using the SiD detector concept, and discuss the effects of the machine parameters on preliminary detector and electronics design.