Design and Simulation of a Novel High-Efficiency Magnetically Insulated Transmission Line Oscillator

Abstract

A novel high-efficiency magnetically insulated transmission line oscillator (MILO) is proposed and investigated in this article. It has three features. First of all, the widths of vanes are nonuniform while the width of resonant cavities in slow wave structure (SWS) remains unchanged. Second, the width of the first extract cavity shrinks and an extra extractor vane is added to enhance the power extraction. In addition, the emission surface of the cathode decreases, reducing the energy waste. The simulation results show that the novel high-efficiency MILO can generate high power microwave (HPM) with the output power of 6.3 GW and the frequency of 1.42 GHz when the applied voltage and current are 586 kV and 49 kA, respectively. The corresponding power efficiency is 22%. Given the same input, the conventional MILO generates the HPM with the same frequency but a lower power of 5.0 GW. The corresponding power efficiency is 17% smaller than that of our proposed MILO. Additionally, the maximum axial electric field in our proposed structure is 0.64 MV/cm after chamfering, which is lower than the breakdown threshold (1 MV/cm).