Field distribution analysis in deflecting structures

TL;DR

This paper analyzes the field distribution in deflecting structures, focusing on aberrations and nonlinear effects that impact beam quality, and proposes criteria for designing structures with minimized distortions, validated through simulations.

Contribution

It introduces criteria for selecting and designing deflecting structures with reduced aberrations, considering nonlinear field components and hybrid wave modes.

Findings

Identified key nonlinear contributions affecting beam emittance

Developed criteria for minimizing aberrations in structure design

Validated results through numerical simulations

Abstract

Deflecting structures are used now manly for bunch rotation in emittance exchange concepts, bunch diagnostics and to increase the luminosity. The bunch rotation is a transformation of a particles distribution in the six dimensional phase space. Together with the expected transformations, deflecting structures introduce distortions due to particularities - aberrations - in the deflecting field distribution. The distributions of deflecting fields are considered with respect to non linear additions, which provide emittance deteriorations during a transformation. The deflecting field is treated as combination of hybrid waves HE 1 and HM_1. The criteria for selection and formation of deflecting structures with minimized level of aberrations are formulated and applied to known structures. Results of the study are confirmed by comparison with results of numerical simulations.