Generate Uniform Transverse Distributed Electron Beam along a Beam Line

TL;DR

This paper proposes a method to generate and maintain a uniform transverse distributed electron beam along a beam line using octupoles and specific optics, enhancing free-electron laser efficiency.

Contribution

It introduces a novel approach for creating and preserving a uniform transverse electron beam distribution within undulators, verified through simulations.

Findings

Successful generation of UTD electron beam in simulations

Method enhances energy extraction efficiency in free-electron lasers

Design provides a practical way to maintain beam uniformity

Abstract

It has been reported that transverse distribution shaping can help to further enhance the energy extraction efficiency in a terawatt, tapered X-ray free-electron laser. Thus, methods of creating and keeping almost uniform transverse distributed (UTD) beam within undulators are required. This study shows that a UTD electron beam can be generated within evenly distributed drift sections where undulators can be placed, by means of octupoles and particular optics. A concrete design is presented, and numerical simulations are done to verify the proposed method.