Experimental microwave power extraction 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 oscillator capable of producing high-power microwaves (HPM). The first multi-frequency RPM, termed the MFRPM-6+8, consists of a 6-cavity 1-GHz and 8-cavity 2-GHz set of planar cavity arrays coupled by cylindrical electron beam / RF recirculation bends. Recent experimental work involved installation of an axial microwave power extraction assembly. Experiments are currently underway using a -300 kV, 200-300 ns voltage pulse, a 0.1-0.3 T axial magnetic field, and a Mode-Control Cathode (MCC) with a velvet electron emitter.