Resonant Island Trapping in a Fourth-Generation Synchrotron Light Source
E. C. Cort\'es Garc\'ia, N. Carmignani, F. Ewald, S. A. Antipov, K. Scheidt, S. White, and I. V. Agapov

TL;DR
This paper reports the first direct observation of nonlinear resonance island trapping in a fourth-generation synchrotron light source, providing insights into beam dynamics and potential applications in photon science.
Contribution
It presents the first direct observation of resonance island trapping in a modern light source and explores its implications for beam dynamics and machine characterization.
Findings
Observation of nonlinear resonance island trapping
Insights into bunch purity and halo formation
Potential for nonlinear machine optics characterization
Abstract
We report the first direct observation of nonlinear resonance island trapping in a fourth-generation light source with working points far from the excited resonance and examine the nonlinear dynamics and properties of the trapped beam. The discovered dynamics of island trapping may help understand bunch purity and halo formation issues, create additional experimental capabilities for photon science applications, and present means of nonlinear characterization of the machine optics.
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