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We analyze radiation from a bunch that uniformly moves in a circularwaveguide and crosses the boundary between two areas: with a corrugated walland with a smooth wall. It is assumed that the corrugation period is much lessthan the wavelengths under consideration. However, in difference with ourpervious works, the corrugation depth is of the same order as the wavelength.The influence of corrugation on the electromagnetic field is investigated usingthe method of equivalent boundary conditions. At first, we consider a regularcorrugated waveguide. Then two cases of the waveguides with boundaries betweenthe corrugated and smooth regions is studied: first, when the bunch flies outof the corrugated part into the smooth one, and second, when the bunch fliesinto the corrugated part from the smooth one. We obtain and analyze theanalytical expressions for the field components in both areas and reveal themain physical peculiarities of the bunch radiation.

Radiation of a bunch in a waveguide having areas with deeply corrugated and smooth walls