Modern gyrotron beam tunnels are rather complicated structures designed to enhance the suppression of the parasitic oscillations, which may be excited there. In some beam tunnel designs, azimuthal corrugations are engraved on their walls to further improve the suppression of these oscillations. In this work, we investigate the effect of the geometrical properties of the corrugations on the propagation characteristics of TE modes for the simplified model of a smooth waveguide with an azimuthally corrugated region. For this structure, the scattering parameters are calculated and the mode conversion is investigated with the in-house FDTD code COCHLEA.

中文翻译：

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使用 FDTD 方法研究由 TE 模式激发的具有周期性楔形方位角波纹的圆柱形波导

现代回旋束隧道是相当复杂的结构，旨在增强对可能在那里激发的寄生振荡的抑制。在一些梁隧道设计中，方位角波纹刻在其壁上以进一步改善对这些振荡的抑制。在这项工作中，我们研究了波纹的几何特性对具有方位角波纹区域的平滑波导的简化模型的 TE 模式传播特性的影响。对于这种结构，计算散射参数并使用内部 FDTD 代码 COCHLEA 研究模式转换。