Abstract
During the last decades, photocathode rf gun has been proven to besuccessful in generating the high brightness electron beam(~1nC,~1πmmmrad,~1 ps) which is required by the ILC,XFEL, Thomson scattering x-ray source, etc. A photocathode rf gun systemis built to develop electron source for the Thomson scattering x-raysource at Accelerator Laboratory of Tsinghua University. The systemconsists of a BNL/ATF-type 1.6 cell S-band rf cavity, a solenoid foremittance compensation, a laser system and some simple equipments forbeam diagnosis. The first beam measurements of the photocathode rf gun,including the dark current, transverse beam profile, charge and quantumefficiency, are reported.
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