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Initial Experiments on the Recirculating Planar Magnetron with Coaxial Allcavity Extraction

Magnetrons are among the most efficient and compact high power microwave sources. The Recirculating Planar Magnetron (RPM) [1] extends the electron-current limit of classical, cylindrical magnetrons by placing a flat cathode between two, planar, slow-wave structures opposing each other, thereby increasing the cathode area. The Recirculating Planar Magnetron with Coaxial-All-Cavity Extraction (RPM-CACE) utilizes a novel all-cavity extraction scheme [2] to efficiently couple power out of the RPM's planar geometry. Previous particle-in-cell simulations of RPM-CACE, conducted using ICEPIC in collaboration with Air Force Research Laboratory, predicted operation at ∼400 MW with 50-70% efficiency [3].