First Beam Measurements of the S-Band photocathode Radio-Frequency Gun at Tsinghua University

摘要

During the last decades, photocathode rfgun has been proven to be successful 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 system is built to develop electron source for the Thomson scattering x-ray source at Accelerator Laboratory of Tsinghua University. The system consists of a BNL/ATF-type 1.6 cell S-band rf cavity, a solenoid for emittance compensation, a laser system and some simple equipments for beam diagnosis.The first beam measurements of the photocathode rf gun, including the dark current, transverse beam profile,charge and quantum efficiency, are reported.