EXCITATION OF WAKE FIELD AND TRANSITION RADIATION IN A SEMI-INFINITE WAVEGUIDE BY A RELATIVISTIC ELECTRON BUNCH

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. PACS: 52.40.-w; 52.35.-g