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Experiments have been performed testing magnetic priming at the cathode of a relativistic magnetron to study the effects on high power microwave performance. Magnetic perturbations were imposed utilizing three, high-permeability nickel-iron wires embedded beneath the emission region of a 1.27 cm diameter cathode, spaced 120 degrees apart (for N/2 symmetry in an N (6) cavity magnetron). These three,...
Magnetic priming experiments on the UM/ L-3-Titan relativistic magnetron (100 MW in L-band, -300 kV, ~3 kGauss), have shown suppression of unwanted modes and major reduction in starting currents for the pi-mode. Data from continuing experiments on magnetic priming at the cathode will be presented, as well as preliminary data on magnetic priming at the cathode and anode. Azimuthally-varying, axial-magnetic-perturbations...
In order to study the effectiveness of this magnetic priming structure, magnetic field data, modeled from the field precision magnum magnetostatics codes, were imported into 3-D MAGIC PIC and run for the relativistic magnetron. Simulations showed faster startup and enhanced pi-mode control compared to the unprimed baseline
Summary form only given. Research is underway to develop a viable technique to implement magnetic priming in the UM/Titan relativistic magnetron (-300 kV, 5-10 kA, 0.3-0.5 mus) for rapid startup and mode control. Magnetic priming involves imposing N/2 azimuthal variations in the axial magnetic field of an N-vane magnetron operating in the pi-mode. This type of magnetic priming has been demonstrated...
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