Speaker
Description
High-brightness, ultra-low emittance electron beams are essential for XFELs, UED, and UEM. Cryogenic RF copper structures enable higher breakdown thresholds and accelerating gradients, opening new possibilities for ultra-bright sources.
We present the design and optimization of a compact, fully cryogenic injector integrating a C-band (5712 MHz) RF gun and accelerating structure at 77 K, representing a first concept of an all-cryogenic beam test facility. Beam dynamics optimization was performed using ASTRA with the NSGA-II algorithm, targeting low emittance and high peak current. The effects of RF gradient and laser pulse shaping were investigated.A normalized transverse emittance of 0.126 mm·mrad was achieved at 100 pC. Sensitivity to RF jitter and misalignment was also evaluated. These results demonstrate the potential of all-cryogenic injectors for compact XFELs and advanced accelerators.
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