Harmonic frequency generation in the multi-frequency recirculating planar magnetron

The Multi-Frequency Recirculating Planar Magnetron (MFRPM) is a variant of the Recirculating Planar Magnetron (RPM), a crossed-field, high power microwave (HPM) source developed at the University of Michigan1. The MFRPM geometry offers potential advantages over traditional cylindrical cavity magnetrons, such as a large cathode area, with the added benefit of producing multiple frequencies using a single HPM source. Previous research involved the design, fabrication, and demonstration of the MFRPM-6+8, a prototype consisting of a 6-cavity 1-GHz slow-wave structure (SWS) and an 8-cavity 2-GHz SWS. Experiments have successfully extracted simultaneous dual-frequency oscillations (1-GHz, 20 MW and 2-GHz, 7 MW) from the MFRPM-6+8 prototype driven by the Michigan Electron Long Beam Accelerator with a Ceramic insulator (MELBA-C) using a -300kV, 0.3-1.0 μs pulse applied to the cathode.