Generation of Relativistic Electron Bunches with Arbitrary Current Distribution via Transverse-to-Longitudinal Phase Space Exchange

TL;DR

This paper introduces a versatile method to precisely shape the current distribution of relativistic electron bunches by leveraging phase space exchange, enabling tailored microbunch trains and ramped profiles for advanced accelerator applications.

Contribution

A novel technique that uses phase space exchange to customize electron bunch current profiles, including microbunch trains and ramped distributions, with potential broad applications.

Findings

Successfully simulated generation of microbunch trains with tunable spacing.

Demonstrated creation of linearly-ramped current profiles.

Showed the method's flexibility to produce arbitrary current distributions.

Abstract

We propose a general method for tailoring the current distribution of relativistic electron bunches. The technique relies on a recently proposed method to exchange the longitudinal phase space emittance with one of the transverse emittances. The method consists of transversely shaping the bunch and then converting its transverse profile into a current profile via a transverse-to-longitudinal phase-space-exchange beamline. We show that it is possible to tailor the current profile to follow, in principle, any desired distributions. We demonstrate, via computer simulations, the application of the method to generate trains of microbunches with tunable spacing and linearly-ramped current profiles. We also briefly explore potential applications of the technique.