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The normal temperature drift tube linac, serving as an injector for medical synchrotrons, is typically based on APF and KONUS beam dynamics within IH-mode cavities to achieve cost-effectiveness and operational stability. While the APF structure combines acceleration and focusing through phase adjustment, its relatively low accelerating gradient results in a lengthy cavity. Conversely, the KONUS scheme offers a high accelerating gradient and compact design by operating near a zero-degree synchronous phase. However, it requires internal quadrupole triplets for transverse focusing, increasing both cost and mechanical complexity. To address these limitations, this paper proposes a novel acceleration structure that employs flat plate electrodes instead of conventional cylindrical drift tubes. Integrated into a CH-mode cavity with vanes to optimize the electric field and RF performance, this design is combined with KONUS dynamics to enable transverse focusing during near-zero-degree acceleration, leading to a more compact and efficient system. This paper presents the design, fabrication, and preliminary test results of this innovative structure.
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