Design and simulation of double ladder cathode magnetically insulated transmission line oscillator

As a combination of load-limited MILO and tapered MILO, a double ladder cathode MILO is presented in this paper. This new type of MILO has six vanes, the first two work as the RF chokes, the middle three work as the slow wave structure, and the last one works as a microwave extractor. As a distinguishing feature of the device, its cathode is constructed by three different radii cylinders in the beam emission region. According to Maxwell equations and Floquet’s theorem, the dispersion function of TM modes is derived, and its dispersion characteristic is analyzed through numerical calculation. 2.5 D particle simulation tells that, the operation frequency of the device is 1.21 GHz which agrees with the theoretical calculation, and the introduction of a double ladder cathode has little influe