Speaker
Description
The Future Circular electron-positron Collider (FCC-ee), with a circumference of approximately 91 km, is being rapidly developed by CERN and its collaborators. Two collider-ring optics proposals have been developed in parallel over recent years. Each proposal features its own strengths and challenges.
The Global Hybrid Correction optics (GHC) came first with a ring-distributed correction of the horizontal chromaticity generated in the Interaction Regions (IRs), using many sextupole pairs. A local conventional chromaticity correction section is used in the IR for the vertical plane.
The more recent Local Chromaticity Correction (LCC) scheme proposal uses both vertical and horizontal chromatic correction sections in the IRs and keeps a modular design.
A comparison process was carried out between late 2025 and early 2026 to prepare for the review process of the
FCC-ee baseline magnetic lattice and optics in view of the Technical Design Report. This contribution presents the comparison process of these two optics designs from the perspective of beam dynamics and performance.
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