Dispersion in dielectric-lined waveguides designed for terahertz-driven deflection of electron beams

Georgiadis, V. and Healy, A.L. and Hibberd, M. T. and Burt, Graeme and Jamison, Steven and Graham, D.M. (2021) Dispersion in dielectric-lined waveguides designed for terahertz-driven deflection of electron beams. Applied Physics Letters, 118 (14): 144102. ISSN 0003-6951

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Abstract

We have developed dielectric-lined rectangular waveguide structures for terahertz (THz)-driven ultrafast deflection of 100 keV electron beams. The structures were designed to achieve THz phase velocity matching with co-propagating electron bunches. The phase-matching capability was experimentally confirmed through time-frequency analysis of the broadband coherent THz transmission measured by electro-optic sampling. The analysis determined both the frequency dependent propagation constants in the electron interaction region, and the propagation characteristics of the integrated THz tapered coupler.