Calculation of impedance of azimuthal transmission line in induction voltage adder accelerator
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摘要: 在进行感应电压叠加装置设计时, 为了使初级脉冲形成与传输系统产生的快前沿高压脉冲均匀耦合到次级传输线, 需要建立感应腔的二维电路模型对电磁波在角向传输线中的传播过程进行分析, 并基于电路计算结果优化设计角向传输线阻抗分布规律，使次级传输线中电流能够均匀分布。由于角向传输线结构复杂, 没有精确求解阻抗值的解析公式, 介绍了一种基于电报方程和瞬态电磁场仿真求解复杂结构传输线阻抗值的方法, 采用该方法对等宽度和变化宽度两种结构角向传输线阻抗值进行了评估。研究结果表明，相比于三平板传输线阻抗计算公式, 采用微带传输线阻抗计算公式对角向传输线阻抗值进行求解结果更加精确。Abstract: The impedance of an azimuthal transmission line should be accurately evaluated when we design and model the induction cavity of an induction voltage adder generator. Because of the complexity of the azimuthal transmission line, the impedance cannot be derived analytically. One method to calculate the impedance of a complex structure transmission line is introduced in this paper. This method is based on the telegraph equation and the transient EM simulation. The impedances of the azimuthal transmission lines with constant width and variable width are evaluated by using this method. The results show that the impedance of the azimuthal transmission line can be estimated by micro-strip transmission line formula, which is more accurate than the triplate transmission line formula.
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