Speaker
Description
High-brightness, ultra-low emittance electron beams are critical for X-ray free-electron lasers (XFELs), ultrafast electron diffraction (UED), and microscopy (UEM). Recent advances in cryogenic RF copper structures have achieved higher breakdown thresholds, enabling increased accelerating gradients and improved beam quality.
We present the design of a compact, fully cryogenic test platform integrating a C-band 5.712 GHz RF gun and matching accelerating structure, operating at 77 K. This represents the first all-cryogenic beam test facility aimed at exploring high-gradient limits and validating next-generation injector architectures.
Beam dynamics simulations using ASTRA and the NSGA-II genetic algorithm optimized for minimal transverse emittance while maintaining high peak current. The study systematically examined effects of high-gradient RF fields, laser pulse shaping, cathode properties, and accelerating gradients on beam quality. Exploiting cryogenic operation capabilities, we achieved a normalized transverse emittance of 0.106 mm·mrad at 100 pC bunch charge. Sensitivity to component misalignment and RF jitter was also evaluated, providing a foundation for ultra-bright electron injectors in compact XFELs and advanced accelerator applications.
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