“The Future Circular Collider (FCC) is at the stage of the feasibility study to become the next flagship project after the High Luminosity upgrade of the LHC. It would be installed in a 91 km long tunnel, used for two configurations of the machine: first, a lepton collider stage (FCC-ee) followed by a hadron collider stage (FCC-hh). The FCC-ee will implement a crab-waist configuration, resulting in a very dense Machine Detector Interface (MDI). The current design, very elegant but also very complex, integrates two cryostats going inside the detector while containing accelerator components. These components (final focusing quadrupoles, beam position monitors, luminometers, ...) and the cryostat will be supported by a skeleton from outside the detector in a cantilever configuration. Conditions around these components (space, temperature, radiations, magnetic fields) will be harsh. The state of the art in terms of alignment and monitoring in other similar MDIs is far from what is required for the FCC-ee and a new system is needed to be designed.
This talk aims to expose, clarify, and tackle the different challenges around the alignment and monitoring of components of the MDI. New and innovative systems, based on Frequency Scanning Interferometry, as well as simulations and experimentations will be presented.”