“APEX, the focus of the Advanced Photon Injector Experiment at DOE’s Lawrence Berkeley National Laboratory, is an electron gun specifically designed for the front end of superconducting accelerators that will power the next generation of light sources based on free electron lasers, or FELs. FELs are undulators that wiggle electron bunches to produce pulses of coherent light. What makes APEX special is that it will continually produce well-shaped, ultrashort packages of electrons at rates of up to a million bunches per second.”
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The APEX electron gun.