CMB-S4 Instrumentation

CMB-S4 is a major focus of the ground based CMB community. Three key science goals driving the technical requirements for CMB-S4 are: 1) searching for primordial gravitational waves resulting from an early period of accelerated expansion (inflation), 2) searching for new light relic particles in the early universe, and 3) providing a legacy survey of nearly half the sky at centimeter to millimeter wavelengths. Crossing critical thresholds for these science topics requires fielding the largest proposed payload of superconducting detectors on multiple telescopes across different sites. I will provide an overview of the CMB-S4 instrumentation plan with particular focus on its superconducting detector technology.