Speaker
Description
We benchmark analytic and numerical self-field models for a near-Gaussian photoinjector bunch. Kim's analytic three-dimensional Gaussian model is compared with OPAL's mesh-based space-charge solver and two in-house calculations: direct Coulomb summation and FFT-based Green-function convolution. The comparison is performed in the bunch rest frame for a 100 pC, $\gamma \approx 12$ Gaussian bunch. The transverse electric fields show strong agreement between Kim's model and OPAL, supporting the use of the analytic model as a fast benchmark for near Gaussian bunches. The longitudinal field is more sensitive to bunch asymmetry and boundary treatment, revealing small systematic differences between methods. These results clarify the practical limits of Gaussian analytic models and provide a controlled validation case for numerical space charge solvers.
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