The unique electron gun that Filippetto and his team are using is a part of Berkeley Lab's APEX (Advanced Photo - injector EXperiment), which has served as a prototype system for LCLS - II, a next - generation X-ray laser project underway at SLAC National Acceleratory Laboratory in Menlo Park, Calif..
A team at Berkeley Lab has designed, built, and delivered a
unique version of a device, called an injector
gun, that can produce a steady stream of these
electron bunches.