Speaker
Description
The luminosity performance of FCC-ee is sensitive to spurious optics errors at the Interaction Point (IP), notably to nonzero waist shift, vertical dispersion, and transverse coupling. Using the code Xsuite, we study how these aberrations influence beam sizes, luminosity, and beamstrahlung power, for the FCC-ee baseline parameters. Multi-turn simulations have been carried out to study the equilibrium distribution/dynamics. Simulated sensitivities for linear lattice descriptions allow an assessment regarding the impact of strong-strong beam-beam effects on IP tuning. By scanning the amplitude of individual linear IP optics aberrations, we infer tolerance estimates for which the simulated performance remains compatible with the design expectations. We compare these with the results of earlier (single-pass) simulations by the code GUINEA-PIG and with analytical calculations. Our study aims at providing a consistent picture of beam–beam behaviour at the FCC-ee IP, so as to help devise future strategies for luminosity optimisation and IP tuning.
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