Speaker
Description
High-quality electron beams are critical for imaging experiments that provide detailed microscopic structural insights into materials. The very-high-frequency (VHF) electron gun, capable of operating in continuous and pulsed modes, is a preferable option. In this paper, we employ a cold field emission cathode as the emitter in the VHF gun and measure the beam size, transverse emittance, and energy spread to characterize the beam quality. To minimize energy spread, we use apertures at different positions. The cathode plug is designed to integrate with a tungsten tip with an approximately 100 nm radius of curvature at the apex. A groove design on the plug's surface provides preliminary beam focusing, while subsequent refinement of the beam quality is achieved using solenoids. The combination of the VHF gun and a cold field emission cathode is expected to serve as a high-quality source for MeV electron imaging, enabling such experiments without reliance on laser systems.
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