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Schematic of the XLEAP sub-fs experiment. A short high-current spike is generated in the electron bunch by interaction of the beam with a high-power laser. The electron beam is kicked transversely to suppress lasing in all but the last eight undulator sections, allowing space charge to introduce a large energy chirp. Finally, the orbit is straightened and the electron beam is sent through a tapered undulator for the generation of sub-femtosecond pulses. (Online version in colour.)
