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- V. Petrillo
Universita' degli Studi di Milano, Milano, Italy
- M.P. Anania, M. Bellaveglia, E. Chiadroni, D. Di Giovenale, G. Di Pirro, M. Ferrario, G. Gatti, R. Pompili, C. Vaccarezza, F. Villa
INFN/LNF, Frascati (Roma), Italy
- M. Artioli
ENEA-Bologna, Bologna, Italy
- A. Bacci, A.R. Rossi
Istituto Nazionale di Fisica Nucleare, Milano, Italy
- A. Cianchi
Università di Roma II Tor Vergata, Roma, Italy
- F. Ciocci, G. Dattoli, L. Giannessi, A. Petralia, M. Quattromini, C. Ronsivalle, E. Sabia
ENEA C.R. Frascati, Frascati (Roma), Italy
- A. Mostacci
Rome University La Sapienza, Roma, Italy
- P. Musumeci
UCLA, Los Angeles, California, USA
- J.V. Rau
ISM-CNR, Rome, Italy
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We present a direct and powerful method for generating train of radiation pulses based on the FEL radiation from a multi-peaked electron beam produced with a combed laser pulse accelerated and compressed in a linac by the velocity bunching technique. The electron beam, constituted by two bunches, can be extracted from the accelerating section when they are temporaly superimposed but separated in energy, so that each of them is characterized by a different value of the Lorentz factor. When driven in the FEL undulator, they emit two separate spectral lines, according to the FEL resonance condition, that interfere producing fringes in the time-domain. In this way a train of regular pulses can be obtained, without limitation in frequency, and with the perspective of reaching the attosecond domain in the X ray regime.
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