Space Charge and Future Light Sources

TL;DR

This paper investigates how space charge effects, traditionally considered negligible at ultrarelativistic energies, become significant in next-generation light sources with extremely small emittance, impacting their injection, stability, and aperture.

Contribution

It demonstrates the influence of space charge effects on the dynamics and stability of advanced light sources nearing the diffraction limit.

Findings

Space charge affects injection dynamics.

Space charge impacts dynamical aperture.

Space charge influences collective beam stability.

Abstract

It is a truth universally acknowledged, that space charge effects in ultrarelativistic electron storage rings are irrelevant due to the steep inverse dependence of their strength on the Lorentz factor. Yet, with the push towards the diffraction limit, the state-of-the-art light sources are approaching the point where their emittance becomes so small that the space charge force can no longer be ignored. In this paper, we demonstrate how space charge effects affect the injection dynamics, dynamical aperture, and collective beam stability on the example of 4th generation light sources PETRA IV and SOLEIL II.