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Updated: Jun 2, 2026

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
Self-amplified spontaneous emission free-electron laser with an energy-chirped electron beam and undulator tapering
L Giannessi1, A Bacci, M Bellaveglia
1ENEA C.R. Frascati, Via E. Fermi,45 00044 Frascati (RM), Italy. luca.giannessi@enea.it
Abstract:
We report the first experimental implementation of a method based on simultaneous use of an energy chirp in the electron beam and a tapered undulator, for the generation of ultrashort pulses in a self-amplified spontaneous emission mode free-electron laser (SASE FEL). The experiment, performed at the SPARC FEL test facility, demonstrates the possibility of compensating the nominally detrimental effect of the chirp by a proper taper of the undulator gaps. An increase of more than 1 order of magnitude in the pulse energy is observed in comparison to the untapered case, accompanied by FEL spectra where the typical SASE spiking is suppressed.
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