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

TL;DR

This paper investigates how transition radiation and dispersion spreading influence the enhancement of the transformer ratio in a dielectric resonator accelerator using a tailored bunch sequence, through numerical simulations.

Contribution

It introduces a new approach to increase the transformer ratio in dielectric resonator accelerators by analyzing transition radiation and dispersion effects with a specific bunch configuration.

Findings

Transformer ratio can be proportional to the number of bunches in a resonator.

Transition radiation and dispersion spreading significantly affect the transformer ratio.

Numerical simulations confirm the potential for higher transformer ratios with optimized bunch sequences.

Abstract

Possibility of increase of transformer ratio TR in the case of the profiled sequence of bunches at their injection in a two-beam electron-positron dielectric-resonator collider is considered. Unlike considered earlier the waveguide case, for which TR is equal to the doubled number of bunches of sequence which provide a contribution to the total wakefield, and which is limited by the effect of the group velocity, in a resonator this limitation is absent. For deri-vation in the case of resonator of TR, proportional to the number of bunches, as well as in the waveguide, the ratio of bunch charges is selected to be equal 1:3:5: ..., lengths of bunches, equal to the half of wavelength, interval be-tween bunches is multiple to the wavelength. The effect of transition radiation and dispersion spreading on the transformer ratio is studied by numerical simulation.