Speaker
Description
A comprehensive impedance model is required to ensure beam stability and optimize performance in the FCC-ee main rings. The model integrates contributions from a wide range of components, accounting for both resistive-wall and geometric effects. In this paper, we discuss the main challenges introduced by the peculiar FCC-ee parameter regime. A first difficulty arises from the combination of large beam-pipe dimensions and very short bunch lengths, which drives wakefield simulations into an extremely demanding computational regime, where very fine spatial resolution is necessary to accurately capture the beam–environment interaction. In addition, the beam-pipe cut-off lies within the frequency range excited by the FCC-ee beam. As a consequence, several higher-order modes may propagate over long distances, leading to non-local impedance effects and possible crosstalk between different accelerator elements. This means that the impedance environment cannot be treated as purely local, but requires a distributed description and an assessment of how propagating power is transported and potentially absorbed within the machine.
| In which format do you inted to submit your paper? | LaTeX |
|---|