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This work presents the design, simulation, and validation plan of a C-band spherical pulse compressor for the CEPC linac. The study is based on the RF power scheme in which one 80 MW klystron drives four accelerating structures. To meet this requirement, the compressor is designed to achieve an energy multiplication factor of M ≥ 1.9, enabling stable operation at 64 MW input power and supporting the 40 MV/m accelerating-gradient target.
Compared with conventional pulse compressors, the spherical structure provides a compact geometry, high unloaded quality factor, relatively uniform surface field distribution, and improved high-power reliability. The research includes CST-based optimization of a dual-mode 3 dB circular-polarization coupler, eigenmode analysis of the TE₁₁₄ spherical cavity modes, integrated frequency- and time-domain simulations, machining-error analysis, and multiphysics evaluation. Fabrication, cold testing, and high-power testing will be conducted to verify the prototype performance.
Keywords: C-band; spherical pulse compressor; CEPC linac; 80 MW klystron; energy multiplication factor.
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