title: Experimental characterization of superradiance in a single-pass high-gain laser-seeded free-electron laser amplifier.
abstract: In this Letter we report the first experimental characterization of superradiance in a single-pass high-gain free-electron laser (FEL) seeded by a 150 femtosecond (FWHM) Ti:sapphire laser. The nonlinear energy gain after an exponential gain regime was observed. We also measured the evolution of the longitudinal phase space in both the exponential and superradiant regimes. The output FEL pulse duration was measured to be as short as 81 fs, a roughly 50% reduction compared to the input seed laser. The temporal distribution of the FEL radiation as predicted by a numerical simulation was experimentally verified for the first time.
authors.affiliation: National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000, USA. twatanabe@bnl.gov
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
authors.forename: X J
authors.initials: XJ
authors.lastname: Wang
authors.forename: J B
authors.initials: JB
authors.lastname: Murphy
authors.forename: J
authors.initials: J
authors.lastname: Rose
authors.forename: Y
authors.initials: Y
authors.lastname: Shen
authors.forename: T
authors.initials: T
authors.lastname: Tsang
authors.forename: L
authors.initials: L
authors.lastname: Giannessi
authors.forename: P
authors.initials: P
authors.lastname: Musumeci
authors.forename: S
authors.initials: S
authors.lastname: Reiche