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Extremely high beam-to-radiation energy conversion efficiencies can be obtained in a THz FEL using a strongly tapered helical undulator at the zero-slippage resonant condition, where a circular waveguide is used to match the radiation group velocity to the electron beam longitudinal velocity. We report on single-shot Electro-Optic Sampling (EOS) based measurements of the broadband THz FEL radiation pulses emitted in this regime. The technique allows full reconstruction of the THz field waveform. The measurements are performed varying the input electron beam energy in the undulator providing insights on the complex dynamics in a waveguide FEL.
Pietro Musumeci andMaximillian Lenz
"Electro-optic-based characterization of a THz FEL", Proc. SPIE PC12870, Real-time Measurements, Rogue Phenomena, and Single-Shot Applications IX, PC128700C (13 March 2024); https://doi.org/10.1117/12.3010556
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Pietro Musumeci, Maximillian Lenz, "Electro-optic-based characterization of a THz FEL," Proc. SPIE PC12870, Real-time Measurements, Rogue Phenomena, and Single-Shot Applications IX, PC128700C (13 March 2024); https://doi.org/10.1117/12.3010556