Terahertz superradiance of an extended electron bunch moving in an oversized corrugated cylindrical waveguide

We consider superradiance from an extended relativistic electron bunch moving in a periodically corrugated cylindrical waveguide for the generation of multi-megawatt terahertz pulses. To study this process, we have developed a self-consistent, quasi-optical theory which includes a description of the formation of evanescent wave near a corrugated surface and its excitation by RF current induced in the electron bunch.