论文标题
开放式介电圆形波导处的衍射：严格的方法
Diffraction at the Open-Ended Dielectric-Loaded Circular Waveguide: Rigorous Approach
论文作者
论文摘要
提出了一种优雅，方便的严格方法，用于解决圆形开放式介电介电衍射衍射问题。它使用相应的Wiener-Hopf-fock方程的解决方案，并导致波导的反射系数（S-Parameter）的无限线性系统，可以使用还原技术在数值上有效地求解后者。作为一个基于介电衬里毛细管的直接适用于光束驱动的辐射源的特定示例，考虑了慢慢的TM对称模式在圆形波导的开放端具有均匀介电填充的圆端。一系列这样的模式形成了由带电粒子沿波导轴的带电粒子产生的韦克菲尔德（切伦科夫辐射场）。将计算出的S参数与从COMSOL模拟获得的S-参数进行了比较，并显示了出色的一致性。预计该方法将非常方便地用于分析对Terahertz（THZ）波的各种电磁相互作用（免费和指导）的各种电磁相互作用，并在现代的Beam-thz Emitter，THZ Emitters，THZ加速器和THZ基于THZ的束束操纵和Bunch-Bunch诊断系统中，具有慢波结构的带电粒子束前瞻性。
An elegant and convenient rigorous approach for solving circular open-ended dielectric-loaded waveguide diffraction problems is presented. It uses the solution of corresponding Wiener-Hopf-Fock equation and leads to an infinite linear system for reflection coefficients (S-parameters) of the waveguide, the latter can be efficiently solved numerically using the reducing technique. As a specific example directly applicable to beam-driven radiation sources based on dielectric-lined capillaries, diffraction of a slow TM symmetrical mode at the open end of a circular waveguide with uniform dielectric filling is considered. A series of such modes forms the wakefield (Cherenkov radiation field) generated by a charged particle bunch during its passage along the waveguide axis. Calculated S-parameters were compared with those obtained from COMSOL simulation and an excellent agreement is shown. This method is expected to be very convenient for analytical investigation of various electromagnetic interactions of Terahertz (THz) waves (both free and guided) and charged particle bunches with slow-wave structures prospective in context of modern beam-driven THz emitters, THz accererators and THz-based bunch manipulation and bunch diagnostic systems.
