A compact, low field, broadband matching section for externally-powered X-band dielectric-loaded accelerating structures

Yelong Wei, A. Grudiev, B. Freemire, C. Jing
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引用次数: 3

Abstract

It has been technically challenging to efficiently couple external radiofrequency (RF) power to cylindrical dielectric-loaded accelerating (DLA) structures, especially when the DLA structure has a high dielectric constant. This paper presents a novel design of matching section for coupling the RF power from a circular waveguide to an X-band DLA structure with a dielectric constant epsilon_r=16.66 and a loss tangent tan_delta=0.0000343. It consists of a very compact dielectric disk with a width of 2.035 mm and a tilt angle of 60 degree, resulting in a broadband coupling at a low RF field which has the potential to survive in the high-power environment. To prevent a sharp dielectric corner break, a 45 degree chamfer is also added. A microscale vacuum gap, caused by metallic clamping between the thin coating and the outer thick copper jacket, is also studied in detail. Through optimizations, more than 99% of RF power is coupled into the DLA structure, with the maximum electromagnetic fields located at a DLA structure. Tolerance studies on the geometrical parameters and mechanical design of the full-assembly structure are also carried out as a reference for realistic fabrication.
一个紧凑,低场,宽带匹配部分,用于外部供电的x波段介电负载加速结构
如何有效地将外部射频(RF)功率耦合到圆柱形介电负载加速(DLA)结构上一直是一个技术挑战,特别是当DLA结构具有高介电常数时。本文提出了一种新的匹配截面设计,用于将圆形波导的射频功率耦合到介电常数epsilon_r=16.66,损耗tan_delta=0.0000343的x波段DLA结构。它由一个非常紧凑的介质盘组成,宽度为2.035 mm,倾斜角度为60度,在低射频场下产生宽带耦合,具有在高功率环境下生存的潜力。为了防止尖锐的电介质角破裂,还增加了45度倒角。本文还详细研究了由于金属夹紧薄涂层与外层厚铜套之间产生的微尺度真空间隙。通过优化,99%以上的射频功率耦合到DLA结构中,最大的电磁场位于DLA结构中。并对整体结构的几何参数和机械设计进行了公差研究,为实际制造提供参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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