Low energy Beam Tracking Under Scattering for a Cold Electron Source in Manchester

TL;DR

This paper models low-energy electron beam scattering in a novel cold electron source, focusing on mesh scattering effects and emittance growth, to improve high-resolution electron diffraction applications.

Contribution

It introduces new modeling tools for scattering in mesh-supported extraction fields of a cold electron source, emphasizing low-energy spread and emittance control.

Findings

Mesh wire thickness affects emittance growth.

Scattering modeling improves understanding of beam quality.

Tools developed aid in optimizing electron source design.

Abstract

High quality electron beams, with high spatial and tempo- ral resolution, have an important use in electron diffraction experiments to probe and study the constituents of matter. A cold electron source is being developed based on elec- tron ionisation from an atom cloud trapped by using AC magneto-optical methods in the University of Manchester. The technique will produce bunches of electrons well suited for high precision and single shot electron diffraction. In this paper issues of modelling at low energies for this state of art electron source with very low energy spread are presented, with a focus on newly developed tools to model the scat- tering in the meshes used to support the extraction electric fields. The dependence on emittance growth on mesh wire thickness is studied.