Self-Amplified Spontaneous Emission Free-Electron Laser with an Energy-Chirped Electron Beam and Undulator Tapering
- Giannessi, L
- Bacci,A
- Bellaveglia,M
- Briquez,F
- Castellano,M
- Chiadroni,E
- Cianchi,A
- Ciocci,F
- Couprie,M
- 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
- Ronsivalle,C
- Rosenzweig, J
- Rossi,A
- Rossi Albertini,V
- Sabia,E
- Serluca,M
- Spampinati,S
- Spassovsky,I
- Spataro,B
- Surrenti,V
- Vaccarezza,C
- Vicario, C
DOIAbstract
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 selfamplified 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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