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.
Giannessi, L., Bacci, A., Bellaveglia, M., Briquez, F., Castellano, M., Chiadroni, E., et al. (2011). Self-Amplified Spontaneous Emission Free-Electron Laser with an Energy-Chirped Electron Beam and Undulator Tapering. PHYSICAL REVIEW LETTERS, 106(14), 144801 [10.1103/PhysRevLett.106.144801].
Self-Amplified Spontaneous Emission Free-Electron Laser with an Energy-Chirped Electron Beam and Undulator Tapering
CIANCHI, ALESSANDRO;
2011-04-05
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 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.File | Dimensione | Formato | |
---|---|---|---|
2011_PRL.pdf
solo utenti autorizzati
Licenza:
Copyright dell'editore
Dimensione
475.35 kB
Formato
Adobe PDF
|
475.35 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
Questo articolo è pubblicato sotto una Licenza Licenza Creative Commons