Simulation and measurement of a W-band circular TE62 mode generator for gyrotrons

In this paper, a circular TE62 mode generator is simulated and measured in order to test the quasi-optical mode converter system, which would be used in a W-band gyrotron with TE62 mode. The mode generator sequence is rectangular waveguide TE10 - coaxial waveguide TE61 - cylindrical waveguide TE61 - rotating TE61 mode - rotating TE62 mode. Simulation and calculation of the mode generator has been achieved. The optimum converting efficiency of the desired mode is approximately 90%. The output field pattern of the mode generator is presented in a temperature-sensitive liquid crystal display (LCD) sheet by the low-power microwave.