Abstract
The spectacular development of Laser-Plasma Accelerators (LPA) appears very promising for a free electron laser application. The handling of the inherent properties of those LPA beams already allowed controlled production of LPA–based spontaneous undulator radiation. Stepping further, we here unveil that the forthcoming LPA–based seeded FELs will present distinctive spatio-spectral distributions. Relying on numerical simulations and simple analytical models, we show how those interferometric patterns can be exploited to retrieve, in single-shot, the spectro-temporal content and source point properties of the FEL pulses.
Highlights
Free Electron Lasers (FELs) [1, 2] deliver ultrashort, narrow-band and ultrabright pulses down to the hard x-ray range [3,4,5], enabling breakthrough experiments in chemical, physical, and biological sciences. These light sources rely on relativistic electron beams wiggling in the periodic magnetic field of an undulator as gain medium
Chicanes as dispersive elements are used to speed up the electron beam energy to density modulation conversion [9, 10]
Associated to electron beam energy chirping in the Radio-Frequency Accelerators (RFAs) structures producing those beams and to frequency chirped seeds, they opened the door to FEL wavelength tunability [11], two-color operation [12], amplitude and phase control [13, 14], spectro-temporal shaping [15], chirped-pulse compression [16, 17] and temporal reconstruction [18]
Summary
Free Electron Lasers (FELs) [1, 2] deliver ultrashort, narrow-band and ultrabright pulses down to the hard x-ray range [3,4,5], enabling breakthrough experiments in chemical, physical, and biological sciences. These light sources rely on relativistic electron beams wiggling in the periodic magnetic field of an undulator as gain medium. Interacting with the spontaneous radiation of the undulator or an external seed, the electrons experience an energy modulation at the resonance wavelength which is further transformed into a density modulation by dispersive elements. Associated to electron beam energy chirping in the Radio-Frequency Accelerators (RFAs) structures producing those beams and to frequency chirped seeds, they opened the door to FEL wavelength tunability [11], two-color operation [12], amplitude and phase control [13, 14], spectro-temporal shaping [15], chirped-pulse compression [16, 17] and temporal reconstruction [18]
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