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Self-amplified spontaneous emission free-electron laser with an energy-chirped electron beam and undulator tapering |
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| Authors: | Giannessi L Bacci A Bellaveglia M Briquez F Castellano M Chiadroni E Cianchi A Ciocci F Couprie M E Cultrera L Dattoli G Filippetto D Del Franco M Di Pirro G Ferrario M Ficcadenti L Frassetto F Gallo A Gatti G Labat M Marcus G Moreno M Mostacci A Pace E Petralia A Petrillo V Poletto L Quattromini M Rau J V Ronsivalle C Rosenzweig J Rossi A R Rossi Albertini V Sabia E Serluca M Spampinati S Spassovsky I Spataro B Surrenti V Vaccarezza C Vicario C |
| Affiliation: | ENEA 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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