21.1: Recirculating-planar-magnetrons for high power, high-frequency radiation generation

We present results for a new class of magnetrons that utilize two planar sections coupled by recirculating bends. The Recirculating Planar Magnetron (RPM) has the advantages of large cathode and anode areas for high currents and improved heat dissipation capability. There are two major embodiments of the RPM: 1) axial-B/radial-E and 2) radial-B/ axial-E fields. The axial magnetic field embodiment can be operated in either conventional (cathode inside) or inverted (cathode on outside) configurations. Simulations show that the recirculating planar magnetron has advantages for both high power and high frequency radiation generation. Simulations and ongoing experiments will be presented.