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, betatron tunes, luminosity, and beamstrahlung power, for the FCC-ee baseline parameters. Simulations are carried out over 1000s of turns to reach a stable equilibrium state. Simulated sensitivities for both linear and complete nonlinear lattice descriptions allow an assessment regarding the impact of nonlinear lattice 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 behavior at the FCC-ee IP, so as to help devise future strategies for luminosity optimisation and IP tuning.
| In which format do you inted to submit your paper? | LaTeX |
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