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.
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BibTeX
@misc{chen2026intrabeam,
title = {{Intrabeam scattering of chirped electron bunches with non-Gaussian longitudinal distributions and slice mismatch}},
author = {Xiuji Chen and Wencai Cheng and Si Chen and Duan Gu and Haixiao Deng},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.38268},
eprint = {2610.38268},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.38268},
}
RIS
TY - UNPB
TI - Intrabeam scattering of chirped electron bunches with non-Gaussian longitudinal distributions and slice mismatch
AU - Xiuji Chen
AU - Wencai Cheng
AU - Si Chen
AU - Duan Gu
AU - Haixiao Deng
PY - 2026
DA - 2026/10/28
PB - arXiv
DO - 10.48550/arxiv.2610.38268
UR - https://arxiv.org/abs/2610.38268
AB - 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.
ER -