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Enhancing the accelerating gradient of electron linacs reduces facility size and cost. For the 100-km CEPC Higgs-factory ring, injector linac gradient is a critical parameter because, once final beam energy is fixed, accelerating gradient determines linac length and strongly influences overall system design. C-band accelerating structures are considered for the CEPC high-energy injector section to accelerate the beam to 30 GeV. A robust high-gradient design requires optimization of a constant-gradient traveling-wave structure with suitable phase advance and iris thickness from 3.5 mm to 6.0 mm to balance wakefield suppression, RF efficiency, and RF breakdown stability. This work systematically analyzes four operating modes and optimizes key RF and geometric parameters. The results reveal important trade-offs among accelerating efficiency, wakefield control, and breakdown mitigation, providing a practical design baseline for elliptical-iris C-band high-gradient linacs for future CEPC applications.
Footnotes
- Work carried out at IHEP, Beijing, China
** CEPC C-band accelerating structure study
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