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Description
The FCC-ee, a future 91 km circumference lepton collider planned for operation in the coming decades, requires the relative alignment of neighbouring accelerator components to be maintained better than 0.15 mm. The installation of the components in the FCC-ee arcs therefore requires a geometrical network throughout the entire tunnel to enable both the initial positioning and the precise alignment of the components. The determination of such a network, located approximately 200 m underground, is particularly challenging due to the propagation of uncertainties over the 11.3 km distances separating adjacent shafts.
Previous studies identified a Laser Tracker network as a promising solution for transferring positional information, providing satisfactory uncertainty levels in the longitudinal and vertical directions but showing limitations in the radial direction. This paper presents the benefits of combining Laser Tracker networks with wire offset measurements.
