Speaker
Description
Next-generation XFELs require electron beams with reproducible current profiles, reduced longitudinal curvature, and stable compression behavior. At LCLS-II, we employ a hybrid programmable-laser architecture: combining IR-domain programmable shaping with dispersion-controlled nonlinear synthesis (DCNS)*, to generate tuned flattop ultraviolet (UV) temporal profiles that reshape the longitudinal phase space upstream of collective effects. Using tens of picoseconds UV flattops, we obtain smooth, uniform, low-curvature current distributions at 80 pC. The shaping supports strong, linear compression and reproducible 1.9–2.0 kA peak currents without downstream re-optimization. These results establish source-level flattop shaping as a practical route to improved stability, compression tolerance, and brightness in MHz-class XFELs, and a flexible tool for future adaptive beam-delivery modes.
Footnotes
Hao, et al. HPLSE 12 (2024)
*Lemons, et al. Ultrafast Science 4 (2025)
Funding Agency
Work supported by US DOE Contract No.’s DE-AC02-76SF00515, DE-SC0022559, DE-SC0022464, DE-FOA-0002859; NSF Contract No. 2231334, 2436343; and US DOD Contract No. FA9550-23-1-0409.
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