Speaker
Description
Downscaling particle accelerators is crucial to expanding their range of applications. Dielectric-lined waveguides (DLWs) can support hybrid modes with a strong accelerating component. Excited by terahertz (THz) frequency pulses, DLWs can deliver high accelerating gradients over cm-scale interaction lengths, promising the development of future compact electron accelerators. By precisely tailoring the waveguide geometry, the modal field profile and phase velocities can be tuned to maintain synchronisation between the weakly relativistic bunches and the accelerating mode over extended distances. Here, we design and evaluate THz-driven tapered DLWs delivering high-quality, MeV-level electron bunches in two types of symmetrical DLW waveguides: rectangular and cylindrical. The hybrid optimisation process is presented here based on an analytic model of accelerating modes in DLW and on detailed particle-in-cell simulations. We simulate transport and acceleration of an externally injected 100 keV electron beam for various DLW geometries. A genetic algorithm is employed to identify Pareto-optimal geometries based on final bunch qualities such as emittance, energy spread, and charge.
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