Longitudinal Losses Due to Breathing Mode Excitation in Radiofrequency Linear Accelerators

TL;DR

This paper investigates how transverse breathing mode oscillations in particle beams can transfer energy to longitudinal oscillations, leading to beam losses, and develops a model to analyze this effect considering various beam parameters.

Contribution

The paper introduces a new model that explains the coupling mechanism between transverse breathing modes and longitudinal oscillations in RF linear accelerators.

Findings

Breathing mode oscillations can cause significant longitudinal losses.

Losses depend on mismatch size, space-charge effects, and RF parameters.

The model helps predict and mitigate beam losses in accelerators.

Abstract

Transverse breathing mode oscillations in a particle beam can couple energy into longitudinal oscillations in a bunch of finite length and cause significant losses. We develop a model that illustrates this effect and explore the dependence on mismatch size, space-charge tune depression, longitudinal focusing strength, bunch length, and RF bucket length.