MIRC-X is an upgrade of the six-telescope infrared beam combiner at the CHARA telescope
array, the world's largest baseline interferometer in the optical/infrared, located
at the Mount Wilson Observatory in Los Angeles. The upgraded instrument features an
ultra-low noise and fast frame rate infrared camera (SAPHIRA detector) based on e-APD
technology. We report the MIRC-X sensitivity upgrade work and first light results
in detail focusing on the detector characteristics and software architecture.
