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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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