A high-power relativistic magnetron of new conception: simulation and experiment

Investigations on increasing the power and efficiency of a relativistic magnetron microwave generator with "large anode" are presented. General parameters of the installation are: wavelength /spl lambda/=10 cm (S-band), anode-cathode gap is 1 cm, high voltage pulse of 150 ns duration V/sub 0/=500 kV and axial pulsed magnetic field B/sub 0/=0.5 T. Microwave power of P/sub /spl sim///spl sim/1 GW is emitted through a cylindrical waveguide with TM/sub 01/ mode and a horn with a 28-cm output diameter. The first magnetron version VF-1 was limited to a microwave power level of 0.3 GW. It was determined primarily by RF-breakdown inside the cavities and the output space mode RF-converter (resonator structure-coaxial emitter). The new magnetron contains 12 resonators of the open saw-shape type. To eliminate the storage of electrons inside resonator cavities, we use additional permanent magnets in all vanes of the resonators. Finally, we changed the classical Boot-Pickering spatial RF-converter. The new semi-transparent RF-converter transforms both symmetrical and non-symmetrical magnetron modes to travelling waves of the output waveguide.