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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...
An inverted magnetron, with its cathode on the outside and anode on the inside, exhibits faster startup than a conventional magnetron because of the negative-mass behavior of the rotating electron. The tendency toward azimuthal bunching in rotating electrons in a crossed-field device is analyzed with the Particle-In-Cell code, MAGIC.
The “transparent cathode” was proposed as a technique to increase the efficiency of, and reduce the start time of oscillations in a relativistic A6 magnetron. Particle-in-cell computer simulations using MAGIC were extensively performed and documented. Recently experiments were performed and output powers approaching 1 GW in S-band were measured in experiments using a short pulse (9 ns) electron beam...
An analytical expression for the anode current in a relativistic magnetron is derived. The anode current is described as the cathode-to-anode drift of the electron guiding centers in the crossed external dc and induced rf magnetic and electric fields. The drift of the electron guiding centers is analyzed in the frame of reference moving with the phase velocity of the induced rf electric field. The...
Recently at Nagaoka University of Technology (Japan) the energy conversion efficiency for an A6 magnetron with modified diffraction output was demonstrated to increase from 3% to 37% in MAGIC particle-in-cell (PIC) computer simulations. The increased efficiency was attributed to improved matching of the A6 magnetron with the antenna. Optimization of the same magnetron design with application of a...
A three dimensional particle-in-cell (PIC) code, MAGIC3D, is used to examine eigenmode analysis of 2.5 MW S-band pulse tunable magnetron, using hole and slot type resonator with ring strap. Magnetron is invariably operated in pi mode which is being most efficient out of all the possible modes and nondegenerate in nature. So the mode separation between pi mode and adjacent mode is important aspect...
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