Design optimization of non linear tapers for high power gyrotrons using hybrid space mapping techniques

In this paper, the design and optimization of a nonlinear taper, connecting the output section of a gyrotron cavity to the uniform waveguide section, is presented. Non linear Tapers for 170 GHz and 140 GHz gyrotrons operating in TE_31,11 and TE_28,12 modes are taken as a case study. Such gyrotrons find applications in thermonuclear fusion experiments. Hybrid Space Mapping techniques are used for design optimization of the taper in order to reduce computational time and to achieve global optimum. The optimum design of the taper shows the effectiveness of the presented methods.