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Possibility of increase of transformer ratio TR in the case of the profiledsequence of bunches at their injection in a two-beam electron-positrondielectric-resonator collider is considered. Unlike considered earlier thewaveguide case, for which TR is equal to the doubled number of bunches ofsequence which provide a contribution to the total wakefield, and which islimited by the effect of the group velocity, in a resonator this limitation isabsent. For deri-vation in the case of resonator of TR, proportional to thenumber of bunches, as well as in the waveguide, the ratio of bunch charges isselected to be equal 1:3:5: ..., lengths of bunches, equal to the half ofwavelength, interval be-tween bunches is multiple to the wavelength. The effectof transition radiation and dispersion spreading on the transformer ratio isstudied by numerical simulation.

Effect of transition radiation and dispersion spreading at achievement  of a large transformer ratio of driver-bunch energy into wakefield in a  dielectric resonator accelerator