Speaker
Description
The FCC-ee aims at delivering high-precision particle-physics measurements over a wide beam-energy range, from the Z pole at 45.6 GeV up to 182.5 GeV, above the top-pair production threshold. Achieving the target physics precision requires an exceptionally accurate determination of the centre-of-mass energy and, consequently, of the beam energies. The baseline approach relies on resonant depolarization scan of dedicated, transversely polarized pilot bunches up to 80 GeV. By analysing the depolarization signatures with a 3D polarimeter, the spin tune can be extracted with a goal of reaching systematic uncertainties on the beam energy at the level of up to a few 10 keV.
This contribution presents the latest progress of the FCC-ee Energy Calibration and Polarization Working Group, covering recent developments in polarization build-up studies, resonant-depolarization techniques, machine-optics optimization, and polarimetry concepts. The current status is summarized, and the roadmap of technical and conceptual milestones required for the reference design is outlined.
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