Imposing strong correlated energy spread on relativistic bunches with transverse deflecting cavities

TL;DR

This paper introduces a new method using transverse deflecting cavities to impose and remove large energy chirps on relativistic electron bunches, enhancing control over beam energy spread for accelerator applications.

Contribution

The paper presents a novel scheme for energy chirp manipulation using transverse-to-longitudinal mixing with deflecting cavities, including analysis and compensation of nonlinear effects.

Findings

Effective energy spread control demonstrated through numerical simulations.

Nonlinear effects can be mitigated by optimizing Twiss parameters.

Longitudinal space charge effects are analyzed and considered.

Abstract

We demonstrate a novel scheme for imposing and removing large energy chirp on relativistic electron bunches relying on the transverse-to-longitudinal mixing accomplished with a set of transverse deflecting cavities. The working principles of the new concept are explained using the first order matrix formalism in the approximation of the linear single-particle dynamics. The scheme demonstrates versatility regarding the average beam energy, and hence, positioning along the accelerator beamline. The performance of the scheme is numerically investigated with the elegant particle tracking code. It is shown that the associated nonlinear effects, causing emittance deterioration for the extreme quantities of the total energy spread can be effectively compensated by optimization of the Twiss parameters while relying on the eigen-emittance analysis. The impact of the longitudinal space charge effects on the beam dynamics in the proposed scheme is also investigated.