Aberration Corrected Emittance Exchange

TL;DR

This paper demonstrates an aberration-corrected emittance exchange line capable of exchanging transverse and longitudinal emittances differing by four orders of magnitude, enabling high-fidelity beam manipulation for advanced accelerator applications.

Contribution

It introduces a novel aberration correction method for emittance exchange systems with large emittance disparities, improving performance in complex RF-based imaging systems.

Findings

Achieved aberration-free emittance exchange with four orders of magnitude difference

Corrected dominant temporal and magnetic aberrations using higher order magnetic elements

Demonstrated exchange between 1 pm-rad transverse and 10 nm-rad longitudinal emittances

Abstract

Full exploitation of emittance exchange (EEX) requires aberration-free performance of a complex imaging system including active radio-frequency (RF) elements which can add temporal distortions. We investigate the performance of an EEX line where the exchange occurs between two dimensions with normalized emittances which differ by multiple orders of magnitude. The transverse emittance is exchanged into the longitudinal dimension using a double dog-leg emittance exchange setup with a five cell RF deflector cavity. Aberration correction is performed on the four most dominant aberrations. These include temporal aberrations that are corrected with higher order magnetic optical elements located where longitudinal and transverse emittance are coupled. We demonstrate aberration-free performance of an EEX line with emittances differing by four orders of magnitude, \textit{i.e.} an initial transverse emittance of 1~pm-rad is exchanged with a longitudinal emittance of 10~nm-rad.