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Wakefield excitation by a single relativistic electron bunch in aplasma-dielectric accelerating structure has been studied both analytically andnumerically. The structure represents a dielectric-loaded cylindrical metalwaveguide, which has partially plasma-filled channel (the hollow plasmachannel) to transport charged particles. Assuming the linear regime ofexcitation, analytical expressions have been derived for the longitudinal andradial wakefields generated by a finite-size electron bunch. Axial profiles ofwakefield component amplitudes have been studied, and their mode and spectrumanalyses have been performed. Furthermore, the electron bunch-driven wakefieldexcitation has been PIC-simulated numerically for the quasi-linear regime. Thecomparative analysis of the data resulting from analytical studies and the onesobtained by numerical simulation has demonstrated qualitative agreement betweenthe results.

Bunch-excited wakefield in dielectric waveguide with hollow plasma channel