Speaker
Description
Insertion devices with longitudinally periodic fields—such as undulators, damping wigglers, and polarizing wigglers—play a central role in several stages of the FCC-ee injection chain. Accurate field models and efficient long-term tracking are required, as the strong longitudinal field variation cannot be captured reliably with standard multipole expansions. We introduce in the Xsuite simulation toolkit a general model for such devices based on a Maxwell-consistent series expansion of the magnetic field. The expansion is constructed from the on-axis field and its transverse derivatives and is implemented in BPMETH, which provides a direct interface to Xsuite. Particle tracking is performed using the Boris integrator. We assess the approach by comparing Boris integration with a multipole expansion and compare the convergence of the resulting tracking. This framework enables detailed optics and beam-parameter studies for synchrotron light sources, damping rings, and polarization systems.
| Paper status | Resubmitted proceeding files received and assigned to an editor. Accepted by Submitter. |
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