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Description
Charged particle bunches excite wakefields in acceler-ating cavities, and the transverse components of these wakefields can degrade beam stability. Since these effects are mainly driven by higher-order modes (HOMs), effec-tive HOM suppression is essential for accelerator opera-tion. The choke-mode structure is one of the approaches used for HOM damping.
This study presents the design of a 2856 MHz S-band choke-mode travelling-wave accelerating structure. The fundamental-mode parameters of the single cell and cavi-ty chain are optimized using electromagnetic simula-tions. HOM characteristics and wakefields are analyzed using HFSS and CST simulations, and a two-step optimi-zation of the choke geometry is performed. The results show a clear reduction in transverse wake impedance, demonstrating effective HOM suppression.
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