A Compact Mode Conversion Configuration in Relativistic Magnetron With a TE10 Output Mode

A compact mode conversion configuration in A6 relativistic magnetron is proposed, and the magnetron operating in the π-mode can radiate axially with TE₁₀ mode through a rectangular waveguide which is designed to match the anode. This design, on the one hand, makes both the diameter and the axial length of the magnetron minimized, so that the volume of the coils of the applied magnetic field and the distance between the electron dump and the anode block can be reduced. On the other hand, it provides a much purer radiated mode in the output waveguide as a result of the limit to the dimension of the output waveguide for a certain frequency. In 3-D particle-in-cell simulation, the power conversion efficiency can reach 25.3%, corresponding to an output power of 436.0 MW and a resonant frequency of 2.52 GHz, at an applied voltage of 355 kV and an applied magnetic field of 0.4 T.