Recent progress on the harmonic recirculating planar magnetron*

The Multi-Frequency Recirculating Planar Magnetron (MFRPM) [1,2] is a novel high power microwave source capable of generating multiple frequencies simultaneously at multi-MW power levels. Output frequencies were near 1 and 2 GHz, generated by an L-Band Oscillator (LBO) and an S-Band Oscillator (SBO), respectively. ­­The MFRPM is the first dual-frequency HPM magnetron to demonstrate harmonic frequency locking, where the SBO operating frequency locks to the LBO’s harmonic. To study this locking phenomenon, the Harmonic Recirculating Planar Magnetron (HRPM) has been designed. The completed design will be presented, along with relevant simulation results, and preliminary experimental results. The HRPM will be driven by MELBA-C, which applies -300 kV, 1-5 kA for 0.3-1.0 μs. [1] Greening, Ph.D Dissertation, “Multi-Frequency Recirculating Planar Magnetrons,” University of Michigan, 2017, [2] Greening et al, “Harmonic Frequency Locking in the Multi-Frequency Recirculating Planar Magnetron”, IEEE T-ED, vol. 65, 2347, (2018).