The Effect of Electron Lens as Landau Damping Device on Single Particle Dynamics in HL-LHC

TL;DR

This paper investigates how an electron lens influences single particle dynamics in HL-LHC, comparing its effects to traditional octupole magnets to assess its effectiveness in suppressing instabilities.

Contribution

It provides a numerical analysis of the electron lens's impact on particle motion, highlighting its potential as an alternative nonlinear focusing element in high-energy colliders.

Findings

Electron lens induces a significant tune spread comparable to octupoles.

The nonlinear effects of the electron lens are characterized through numerical simulations.

Potential benefits for beam stability in HL-LHC are discussed.

Abstract

An electron lens can serve as an effective mechanism for suppressing coherent instabilities in high intensity storage rings through nonlinear amplitude dependent betatron tune shift. However, the addition of a strong localized nonlinear focusing element to the accelerator lattice may lead to undesired effects in particle dynamics. We evaluate the effect of a Gaussian electron lens on single particle motion in HL-LHC using numerical tracking simulations, and compare the results to the case when an equal tune spread is generated by conventional octupole magnets.