Calculation of impedance of azimuthal transmission line in induction voltage adder accelerator

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.