We report, with an unequivocal time-domain measurement, that an appropriately chosen undulator taper can compensate for an electron beam longitudinal energy-chirp in a free-electron laser amplifier, leading to the generation of single-spike radiation close to the Fourier limit. The measurements were taken using the frequency-resolved optical gating technique by employing an advanced transient-grating diagnostic geometry. The reconstructed longitudinal radiation characteristics are compared in detail to prediction from time-dependent three-dimensional simulations. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4754612]
Time-domain measurement of a self-amplified spontaneous emission free-electron laser with an energy-chirped electron beam and undulator tapering / Marcus, G.; Artioli, M.; Bacci, A.; Bellaveglia, M.; Chiadroni, E.; Cianchi, A.; Ciocci, F.; Del Franco, M.; Di Pirro, G.; Ferrario, M.; Filippetto, D.; Gatti, G.; Giannessi, L.; Labat, M.; Mostacci, Andrea; Petralia, A.; Petrillo, V.; Quattromini, M.; Rau, J. v.; Rossi, A. r.; Rosenzweig, J. b.. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - ELETTRONICO. - 101:13(2012), p. 134102. [10.1063/1.4754612]
Time-domain measurement of a self-amplified spontaneous emission free-electron laser with an energy-chirped electron beam and undulator tapering
E. Chiadroni;MOSTACCI, Andrea;
2012
Abstract
We report, with an unequivocal time-domain measurement, that an appropriately chosen undulator taper can compensate for an electron beam longitudinal energy-chirp in a free-electron laser amplifier, leading to the generation of single-spike radiation close to the Fourier limit. The measurements were taken using the frequency-resolved optical gating technique by employing an advanced transient-grating diagnostic geometry. The reconstructed longitudinal radiation characteristics are compared in detail to prediction from time-dependent three-dimensional simulations. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4754612]I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
