Excitation of wake field and transition radiation in a semi-infinite waveguide by a relativistic electron bunch

Abstract

The theoretical investigations and simulation are performed for the emission of a relativistic electron bunch during the injection into a semi-infinite vacuum/dielectric waveguide. The power and the frequency spectrum of high intensity pulse of ultra-wideband transition radiation, excited by a finite size electron bunch in a vacuum waveguide, are calculated numerically. It is shown that in a dielectric waveguide the short pulse of Cherenkov wake field drifts behind the relativistic bunch with the group velocity.