Intrabeam scattering of chirped electron bunches with non-Gaussian longitudinal distributions and slice mismatch

Abstract

Intrabeam scattering (IBS) can significantly increase the uncorrelated energy spread of high-brightness electron bunches in linear accelerators. For chirped bunches transported through beamlines with dispersion, however, the commonly used simulation codes elegant and RF-Track give substantially different predictions. To investigate this discrepancy, a semi-analytical slice model is developed for bunches with non-Gaussian longitudinal distributions and slice-dependent transverse mismatch. The model predicts slice energy-spread evolution in beamlines with dispersion and provides an independent reference for assessing the simulation results. Benchmarks in an achromatic arc show good agreement with RF-Track for both ideal Gaussian and realistic mismatched bunches in the tested cases. The proposed model provides a practical tool for evaluating IBS in linacs beyond the ideal-Gaussian approximation. The comparison also suggests directions for improving the accuracy and efficiency of PIC-based IBS simulations.