  Wakefield excitation by a single relativistic electron bunch in a
plasma-dielectric accelerating structure has been studied both analytically and
numerically. The structure represents a dielectric-loaded cylindrical metal
waveguide, which has partially plasma-filled channel (the hollow plasma
channel) to transport charged particles. Assuming the linear regime of
excitation, analytical expressions have been derived for the longitudinal and
radial wakefields generated by a finite-size electron bunch. Axial profiles of
wakefield component amplitudes have been studied, and their mode and spectrum
analyses have been performed. Furthermore, the electron bunch-driven wakefield
excitation has been PIC-simulated numerically for the quasi-linear regime. The
comparative analysis of the data resulting from analytical studies and the ones
obtained by numerical simulation has demonstrated qualitative agreement between
the results.
