Speaker
Description
The electron-positron Future Circular Collider (FCC-ee) will initially operate at the Z-pole energy of 45.6 GeV with beams composed of 12'000 bunches, storing a total energy of 17.5 MJ per beam. Combined with small emittances, this results in extremely high beam energy densities that pose a significant damage risk to accelerator components. A comprehensive assessment of powering failure scenarios is therefore essential to ensure safe machine operation. This study evaluates the impact of a powering failure in one of the main dipole circuits using the LCC lattice configuration. Multi-turn bunch tracking simulations are performed to determine the beam response and assess failure criticality. We interpret these novel results with respect to already established results for the GHC lattice. Horizontal orbit excursions are found to develop over a significantly longer timescale than for the GHC lattice. The underlying physics of this behaviour is analysed in detail, with emphasis on the role of the modified sextupole configuration in the arcs. Based on these findings, the implications for machine protection system design, including interlocking requirements and detection strategies, are discussed and mitigation measures are proposed.
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