Speaker
Description
We review envelope and self-field models for space-charge dominated injectors and low-energy transport, with emphasis on their practical use in photoinjector design. Starting from Carlsten’s thin-lens compensation picture, we summarise the associated slice-based conditions and recast them in a compact bracket form that highlights when static linear optics can and cannot reduce slice dependence. We then compare Kim’s analytic 3D Gaussian self-field model with space-charge fields obtained from OPAL’s mesh-based solver and two in-house solvers, Coulomb and FFT-based Green-function convolution for a 100 pC, gaussian bunch in the bunch rest frame. All solvers show very good agreement for the transverse electric fields, while the longitudinal comparison exposes small, systematic differences traceable to bunch asymmetry and boundary treatment. These benchmarks clarify the practical validity and limitations of commonly used space-charge models and support the combined use of Kim’s formulas and modern particle–in–cell solvers as reliable tools for modelling space-charge dominated injectors.
| In which format do you inted to submit your paper? | LaTeX |
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