Speaker
Description
Attosecond FEL pulses can be generated by limiting lasing to a single high-current spike with a duration comparable to the FEL coherence length. At LCLS-II, the XLEAP program generates such a distribution by overlapping a short laser pulse onto the conventional cathode drive laser. Here, we demonstrate that this initial density perturbation drives a pair of counter-propagating space-charge waves that split and travel along the bunch within the low-energy injector. Tuning of the modulation delay and amplitude allow us to select a single spike suitable for downstream compression and attosecond SXR lasing.
Funding Agency
This work was supported by the Basic Energy Sciences Accelerator and Detector Research program under Contract No. DE-AC02-76SF00515, and the Office of Basic Energy Science Accelerator and Detector Res
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