Simulation study of Improved Compact MILO

In the present paper, an improvement has been employ to increasethe efficiency ofcompact MILO [Cousin 2005]. This can be done by changing the length of collector covering the cathode, that helps in modifying the geometry of output waveguide. RF circuit of improved compact MILO comprised of six cavity SWS designed for pi mode operation at 2.8 GHz preceded by a two cavity choke section that acts as an inphase reflector and coaxial extractor whose center conductor serves as a beam dump. The load region is comprised of a beam dump disk and the inner conductor of the output coaxial transmission line. In order to maximize the output power, one has to improve the coupling section between the output waveguide and periodic resonator. The inner conductor of output coaxial transmission line is grounded to the anode by conducting rods, which provide return path for the load current. During simulation, high power microwave is generated with peak power of 3 GW, frequency of 2.8 GHz, and power conversion efficiency of 20% when the voltage is 450kV and the current is 33kA. In Improved compact MILO the length of the cathode is reduced and a beam dump disk is employed as improvement, so that the generated load current can be used properly for magnetic insulation and for the generation of RF power.