Speaker
Description
We present a novel linac topology based on the distributed-coupling paradigm, operating with a 3pi/4 phase advance. Distributed coupling 3pi/4 phase advance structures require four manifolds to supply RF power to the cavities while maintaining a π phase shift between cavities connected to each manifold to ensure equal power distribution. In the topology presented here, the number of physical manifolds is reduced to two by employing over-moded manifolds, each operate with two modes. Although this approach introduces additional RF-design complexity, it simplifies the mechanical structure; it can be manufactured from only two copper slabs. We also describe the coupling mechanism to the manifolds, which allows the system to function as a 3 dB hybrid, resulting in operation with no reflections back to the source; the system, effectively, behaves as a traveling-wave accelerator. Reflected power during the filling period is absorbed in loads integrated into the coupler. Through extensive cavity-shape optimization and the use of the optimal phase advance, the structure achieves the maximum shunt impedance attainable for any linac.
Funding Agency
Work supported by the US department of energy, ASU
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