High-brightness, high-current electron guns for energy recovery linac light sources and high repetition rate X-ray free-electron lasers require an exit beam energy of ≥ 500 keV to reduce space-charge induced emittance growth in the drift space from the gun exit to the following superconducting accelerator entrance. At the Japan Atomic Energy Agency, we have developed a DC photoemission gun employing a segmented insulator to mitigate the field emission problem, which is a major obstacle for operation of DC guns at ≥ 500 kV. The first demonstration of generating a 500-keV electron beam with currents up to 1.8 mA is presented.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)