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.
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Fisher, A. ; Park, Y. ; Lenz, M. ; Ody, A. ; Agustsson, R. ; Hodgetts, T. ; Murokh, A. ; Musumeci, P. ( , Nature Photonics)
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Aidala, C. A. ; Altaf, S. ; Belmont, R. ; Boose, S. ; Cacace, D. ; Connors, M. ; Desmond, E. ; Frantz, J. ; Gamez, E. A. ; Grau, N. ; et al ( , IEEE Transactions on Nuclear Science)null (Ed.)
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Aidala, C. A. ; Bailey, V. ; Beckman, S. ; Belmont, R. ; Biggs, C. ; Blackburn, J. ; Boose, S. ; Chiu, M. ; Connors, M. ; Desmond, E. ; et al ( , IEEE Transactions on Nuclear Science)