Electro-optic sampling based characterization of broad-band high efficiency THz-FEL
Accelerator Physics
2022-09-14 v1
Abstract
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. In this paper we report on the first electro-optic sampling (EOS) based measurements of the broadband THz FEL radiation pulses emitted in this regime. The THz field waveforms are reconstructed in the spatial and temporal domains using multi-shot and single-shot EOS schemes respectively. The measurements are performed varying the input electron beam energy in the undulator providing insights on the complex dynamics in a waveguide FEL.
Keywords
Cite
@article{arxiv.2206.13572,
title = {Electro-optic sampling based characterization of broad-band high efficiency THz-FEL},
author = {Maximilian Lenz and Andrew Fisher and Youna Park and Alexander Ody and Pietro Musumeci},
journal= {arXiv preprint arXiv:2206.13572},
year = {2022}
}