Speaker
Description
Structure Wakefield Acceleration (SWFA) powered by ultra-short RF pulses (~10 ns) generated by Two-Beam Acceleration (TBA) at the Argonne Wakefield Accelerator (AWA) has demonstrated effective suppression of RF breakdowns and achieved gradients exceeding 400 MV/m at X-band frequencies. To fully exploit the benefits of this short RF pulse operation, an accelerating structure must simultaneously achieve two goals: high group velocity (Vg) to ensure rapid RF filling (need for high efficiency), and simultaneously maintain high shunt impedance (R) (need for high accelerating gradient). Conventional accelerating structures involve inherent tradeoffs between these parameters, limiting their effectiveness in the short-pulse regime. To this end, we developed a hybrid structure composed of two co-optimized sub-structures fed by one coupler at the middle: one backward wave (BW) filling and one forward wave (FW) filling sub-sections. This design not only preserves the short-pulse advantage but also amplifies the beam’s energy gain by effectively doubling the acceleration length without requiring extended RF pulse duration. In this work, we present the full RF design, wavefield and transient analysis, and beam-dynamics optimization for high-brightness operation, demonstrating the performance and feasibility of this novel short-pulse BTW–FTW accelerating concept.
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