Speaker
Description
Using short radiofrequency (RF) pulses is a promising method for increasing achievable accelerating gradients while significantly suppressing RF breakdown probability. However, short-pulse operation requires a structure with a commensurately low filling time to ensure efficient gradient buildup. To achieve this, we utilize a distributed power coupling scheme that delivers RF power to each cavity simultaneously through a waveguide array. This parallel feeding mechanism drastically reduces the filling time of the entire accelerating structure compared to traditional series-fed designs. Furthermore, this topology allows for greater flexibility in cavity optimization and yields higher shunt impedance.This work presents the design and simulation of a novel septum power splitter specifically engineered to drive an accelerating structure in this short-pulse regime. The splitter is integrated with a four-cell prototype, enabling
each cavity to be powered individually and concurrently. The system is designed for short ๐-band RF pulses with peak powers up to 400 MW at 11.7 GHz. The four-cell structure is over-coupled and maintains a (2/3)๐ phase advance between adjacent cells. CST simulation results confirm the
performance of this design in achieving high accelerating gradients. Finally, we outline the experimental plan for the prototype demonstration at the Argonne Wakefield Accelerator.
Funding Agency
This research was supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics under Award DE-SC0021928.
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