Relativistic Magnetron Priming by Loading the Resonators Through Dielectric and Metal Rods

Abstract

A 3-D particle-in-cell code MAGIC-3-D has been used to examine the output performance of a relativistic magnetron under the combined effect of electric priming by insertion of dielectric rods alternating magnetic field perturbing metal rods in the side RF resonators. The side resonators of the resonant structure have been loaded symmetrically at an angle of 120° with low-loss dielectric rods to implement the electric field priming. The three symmetrical metal rods at an angle of 120° in the side resonators have been used to perturb the RF magnetic field as well as tuning the frequency of oscillation. All the simulations have been performed for 2π-mode of operation on the well-known A6 relativistic magnetron. The formation of six electron spokes in the oscillation region confirms 2π-mode oscillation in a six vane relativistic magnetron. The results indicate single-mode operation with improved radiated output power with relatively low deviation in hot RF frequency in comparison with unloaded resonant structure. A power increase of 27% with 30% reduction in startup oscillation time is found in three symmetrical dielectric rods alternating three metal rods in side resonators in comparison with unloaded resonant structure.