Speaker
Description
Integrating corrector coils into quadrupole magnets offers compact steering for high-current ERLs, but the quadrupole yoke distorts the corrector field, especially at large transverse offsets. In PERLE’s injector/merger region the beam is space-charge dominated, and the focusing must be kept weak to limit emittance growth. This creates a balance: a tighter beam increases space-charge effects, while a wider beam enters regions where the corrector field becomes strongly nonlinear and can drive halo formation.
Beam-based mapping of a similar magnet was performed at cERL. The beam was steered across the transverse plane using an upstream corrector, and the resulting trajectories were observed on a downstream screen to produce a practical kick map. These measurements guided the design of quadrupoles with embedded correctors for PERLE using OPERA. Complementary BMAD tracking studies evaluated the impact of the nonlinear fields on emittance, steering efficiency, and halo growth. Together, these efforts form the basis for identifying suitable magnet parameters and acceptable lattice locations for PERLE.
Funding Agency
Supported by EU Horizon Staff Exchange programme EAJADE (101086276), by the France–Japan TYL-FJPPL programme and by ANR France 2030 (ANR-24-RRII-0001).
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