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The high-energy linac of the FCC-ee injector requires high-performance RF structures to accelerate beams up to 20 GeV efficiently and reliably. This work presents an updated 3 GHz traveling-wave design, including full 3D modeling of the linac with power couplers, enabling detailed electromagnetic, thermal, and mechanical analysis.
The structure geometry, particularly iris parameters, was optimized to maximize shunt impedance, minimize peak surface fields, and implement higher-order mode (HOM) detuning for wakefield suppression. A comparison with existing S-band linacs highlights the competitive performance of the proposed design in terms of gradient, efficiency, and wakefield control.
We address bunch-to-bunch energy spread under transient beam loading, introducing the concept of a “golden” RF pulse, an optimized waveform that balances fully loaded and unloaded conditions to reduce energy deviations across variable bunch charges.
Finally, 3D thermal and mechanical simulations ensure structural integrity and reliable operation at 100 Hz repetition rate, while integrated power couplers are analyzed for efficient RF delivery. This study provides a comprehensive framework for next-generation high-energy linac design for the FCC-ee.
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