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The high-energy (HE) linac for the FCC-ee injector complex must deliver 20 GeV beams with high stability for top-up injection. Following an initial design at 2.8 GHz, the RF frequency has been updated to 3 GHz to align with the European S-band standard, enhancing compatibility with existing high-power RF components and industrial manufacturing for the Technical Design Report (TDR) phase.
This paper presents the updated design of 3 m traveling-wave (TW) accelerating structures operating at 3 GHz. A parametric optimization of the full structure geometry is performed, balancing effective shunt impedance and peak surface fields. Beam-loading compensation is applied via optimized RF pulse shaping for various bunch spacings. Detailed wakefield studies are conducted for various bunch spacings to ensure the transverse wake potential remains below the stringent 0.2 V/pC/mm/m threshold. Finally, tolerance studies quantify the sensitivity of wakefield suppression to manufacturing errors, establishing practical fabrication limits for the 3 GHz structures.
| Paper status | Resubmitted proceeding files received and assigned to an editor. Accepted by Submitter. |
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