Studies on equivalent circuit approach to design waveguide break for 14.45 GHz ECR ion source

In this article an equivalent circuit approach based on transmission line theory is proposed to design the waveguide break for 14.45 GHz ECR ion source. The parameters of three designs of waveguide break are first obtained using equivalent circuit approach. These designs are then simulated using a commercial FEM software ANSYS HFSS. Furthermore, all the designs are fabricated and reflected power for all the designs are measured at a forward power of 200W. Finally, a comparison is drawn among the results of equivalent circuit approach, HFSS simulation and measurements. It is demonstrated first time in this work that equivalent circuit approach is quite effective in the design of waveguide break and can estimate reflected power with an error less than 4% as compared to the measurement results.