Large-bandwidth two-color free-electron laser driven by a comb-like electron beam

• Published in: New journal of physics Vol. 16; no. 3; pp. 33018 - 13
• Main Authors: Ronsivalle, C, Anania, M P, Bacci, A, Bellaveglia, M, Chiadroni, E, Cianchi, A, Ciocci, F, Dattoli, G, Di Giovenale, D, Di Pirro, G, Ferrario, M, Gatti, G, Giannessi, L, Mostacci, A, Musumeci, P, Palumbo, L, Petralia, A, Petrillo, V, Pompili, R, Rau, J V, Rossi, A R, Vaccarezza, C, Villa, F
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 14-03-2014
• Subjects: 74.20.-z; Adjustable; Amplifiers; bunch train; Color; Compressing; Electron beams; Flexibility; Free electron lasers; free-electron laser; high brightness electron beams; Laser beams; Lasers; Linear accelerators; Physics; two-color radiation; velocity bunching
• ISSN: 1367-2630; 1367-2630
• DOI: 10.1088/1367-2630/16/3/033018

We discuss a two-color SASE free-electron laser (FEL) amplifier where the time and energy separation of two separated radiation pulses are controlled by manipulation of the electron beam phase space. Two electron beamlets with adjustable time and energy spacing are generated in an RF photo-injector illuminating the cathode with a comb-like laser pulse followed by RF compression in the linear accelerator. We review the electron beam manipulation technique to generate bunches with time and energy properties suitable for driving two-color FEL radiation. Experimental measurements at the SPARC-LAB facility illustrate the flexibility of the scheme for the generation of two-color FEL spectra.