Abstract
A high repetition rate, MHz, electron source is a key element in future FEL based light sources. The Advanced Photo-injector Experiment (APEX) at Lawrence Berkeley National Laboratory (LBNL) consists of a high repetition rate 186 MHz (VHF-band) CW electron gun, 1 MHz UV laser source, a pulsed 30 MeV linac, and the diagnostic components necessary to quantify the gun’s performance. The gun design is based on well-established, conventional RF cavity design, with a couple notable exceptions. The basis for the selection of this technology, novel design features, fabrication techniques and measured cavity performance are presented.
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