Speaker
Description
We revisit the applicability of standard intrabeam scattering (IBS) theories to modern high-density, ultra-low-emittance beams in diffraction-limited storage rings. Classical IBS formalisms by Piwinski, Martini and Bjorken–Mtingwa are derived under assumptions of Gaussian phase-space distributions, small-angle diffusion and weak perturbations. For the parameter range of interest these premises fail: non-Gaussian cores and tails develop, longitudinal–transverse correlations become significant, and the IBS–Touschek continuum renders growth-rate predictions highly sensitive to the specific choice of Coulomb-log and tail-cut parameters. We quantify where these limitations are most severe for multi-bend achromat lattices and discuss consequences for reliable emittance and lifetime predictions in future high-brightness rings.
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