Speaker
Description
Accurate control of the transverse linear coupling is important for achieving the target luminosity in FCC-ee. We have implemented a simplified FCC-ee coupling model in Xsuite based on linear maps and on local lattice coupling matrices. This approach is benchmarked against the full FCC-ee optics model, showing good agreement in the behavior of betatron tunes, beta functions, and coupling-related quantities. The underlying coupling matrix transformations are derived, as a function of some coupling parameters, and checked for consistency by benchmarking against analytical calculations of resonance driving terms (RDT)s. The coupled FCC-ee models are then used to study changes to IP beam size and luminosity caused by controlled excitation of skew-quadrupole pairs in the interaction regions. The results from the full lattice are compared with those obtained by linearised maps. This work presents a practical framework for coupling studies and provides a basis for developing FCC-ee coupling correction and luminosity tuning procedures.
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