Speaker
Description
Intrabeam scattering (IBS) increases emittance and energy spread in low-emittance beams. In angular-dispersion-induced microbunching (ADM) beam lines, nanometre-scale density peaks cannot be represented reliably by a single smooth rms bunch length. This work separates the classical local IBS source from the microbunching spectrum: the former supplies the lattice and phase-space scattering kernel, whereas the latter modifies only the local pair-density weight. Rest-frame smoothing and a microbunching-dependent Coulomb-logarithm correction are introduced to exclude density structures below the collision resolution. For a 26 m branch line, the model gives single-pass microbunching-induced enhancements of 5.630% in the vertical-emittance source and 8.330% in the energy-spread-variance source. The additional source is concentrated in two intervals where the microbunching weight overlaps the local IBS kernel.
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