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Intrabeam Scattering (IBS) is a multiple Coulomb scattering phenomenon between charged particles within a beam, leading to emittance growth and consequent degradation of beam quality. Classical theoretical frameworks for IBS, such as the Piwinski and Bjorken-Mtingwa (BM) formalisms, predominantly rely on the assumption of a Gaussian particle distribution. However, in novel accelerator concepts combining storage rings with Free Electron Lasers (FEL), specifically Steady-State Micro-Bunching (SSMB), the primary bunch is modulated into a train of micro-bunches. In such scenarios, the longitudinal particle distribution deviates significantly from the Gaussian assumption, rendering conventional theories potentially inapplicable. This paper presents a comparative study of IBS effects using various theoretical models and Monte Carlo simulations. We propose a modified IBS model specifically tailored to the non-Gaussian phase-space structure of micro-bunches. Furthermore, the simulation results are discussed in the context of upcoming experimental verification plans aimed at validating the proposed model.
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