Speaker
Description
A C-band parallel-coupled accelerating structure overcomes the RF breakdown limit by reducing filling time. Unlike conventional traveling-wave designs, this architecture feeds each cavity cell simultaneously through a parallel network of coupling irises, distribution waveguides, and a power divider, eliminating inter-cell power transit delays. The cavity geometry is optimized to maximize shunt impedance (5.67 MΩ, Q₀=13024) while maintaining π‑mode synchronization for a relativistic beam. The accelerating structure is designed for strong overcoupling (β=17), enabling rapid energy transfer such that a 50 ns input pulse is fully exploited before reflection occurs. A symmetric dual-waveguide feed network with periodic corrugations ensures equal amplitude and precise phase advance across all ten cells, verified by time-domain simulations showing less than 5% cell-to-cell field variation. With a 150 MW input pulse, the on-axis electric field distribution yields an accelerating gradient of 80 MVm⁻¹, far exceeding typical C‑band performance. This work proves that parallel-coupled structures break the traditional trade-off between gradient and pulse length for compact high-gradient linacs.
Funding Agency
This work is supported by the Institute of High Energy, China Academy of Sciences (E3545AU2) and the Key Laboratory of Accelerator RF Technology of Dongguan, Guangdong, China.
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