Frequency and Phase Locking Experiments on the Recirculating Planar Magnetron

Experiments and simulations are underway to investigate the frequency and phase locking of a Recirculating Planar Magnetron with Coaxial All Cavity Extraction (RPM CACE). This device features two, planar, 6-cavity, slow-wave-structures designed to oscillate at 1.93 GHz. Microwaves are extracted via 6 coaxial waveguides (3 on each side) that each couple to 2 cavities [1] . Research is focusing on the effects of feedback between various cavities in the two resonator structures. Experiments show that electron emission is not equal between planar sides. Increased feedback is being explored to equalize startup times and power. Extracted single-port peak power levels ranged between 5 and 15 MW. A previous model [2] has been used to show the viability of single frequency operation of the two RPM oscillators when the admittance parameters between cavities are properly adjusted.