Simulations of Magnetic Priming in a Relativistic Magnetron

Particle-in-cell simulations of start-up dynamics in a grounded cathode magnetron

“…For example, the results are very sensitive to small changes in the geometry of the magnetron and to its symmetry. This is, of course, consistent with the results reported in [8] and [9] and the drastic effects of the magnetic field priming on the noise.…”

“…Recently, a new mechanism for noise reduction and the suppression of the unwanted modes was suggested [8] by varying the azimuthal external field. Particle-in-cell (PIC) simulations have shown that in fact the azimuthally varying field helps suppressing the unwanted mode [9]. A full theoretical analysis which includes the magnetron self fields as well as the magnetron cavity is complicated.…”

Magnetic Priming of a Relativistic Magnetron

“…This magnetic priming technique was originally demonstrated in kW oven magnetrons by Neculaes et al [10,11,14,15,19]. Simulations using the MAGIC PIC (particle-in-cell) code by Jones et al showed that the application of an idealized magnetic priming field in a relativistic magnetron yielded rapid growth of the π-mode and suppression of mode competition [16,17,20]. Realistic oven magnetron simulations, including straps, using ICEPIC [21] corroborate Neculaes experiments.…”

“…The initial simulation research involving magnetic priming of a relativistic magnetron performed by Jones et al [16][17][18], utilized an idealized magnetic priming field in the simulations. The idealized field imposed was of the form,…”

“…The aspects of magnetron performance in which improvement is sought include mode control, peak power, start-oscillation time, and pulse length. One promising technique that has emerged as a way to enhance magnetron performance is "magnetic priming" [10][11][12][13][14][15][16][17][18][19].…”