# Uniform transverse beam profile with a new type nonlinear magnet

## TL;DR

This paper introduces a novel nonlinear magnet design that achieves a uniform transverse beam profile with reduced particle loss, offering adjustable beam width and improved performance over traditional octupole magnets.

## Contribution

A new nonlinear magnet type is proposed and validated through simulations, providing a more efficient way to produce uniform beam profiles with adjustable width and lower particle loss.

## Key findings

- The new magnet produces a similar field to octupoles in the middle region.
- It has a faster decline in field strength at the edges.
- Numerical simulations show advantages over octupole magnets.

## Abstract

In this paper, a new type magnet is proposed and processed to uniform the transverse beam profile. Compeared to the octupole, the new type magnet can prove a similar octupole magnet field in the middle, but the rise rate declines quickly in the edge. So that, a same uniform beam is got with less particles loss. Besides that, a mechanical structure is added to adjust the width of the middle region to satisfy different transverse dimensions, and this whould further reduce particles loss. Some numerical simulations have been done respectively with the octupole and the new type of magnet to show the advantages of the new type magnet.

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Source: https://tomesphere.com/paper/1703.02729