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Magnetic Priming at the Cathode of a Relativistic Magnetron

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10 Author(s)
Hoff, B.W. ; Dept. of Nucl. Eng. & Radiol. Sci., Univ. of Michigan, Ann Arbor, MI ; Gilgenbach, R.M. ; Jordan, N.M. ; Lau, Y.Y.
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Experiments have been performed in testing magnetic priming at the cathode of a relativistic magnetron to study the effects on high-power microwave performance. Magnetic priming consists of N/2 azimuthal magnetic perturbations applied to an N-cavity magnetron for rapid generation of the desired number of electron spokes for the pi-mode. Magnetic perturbations were imposed by utilizing three high-permeability nickel-iron wires embedded beneath the emission region of the cathode, spaced 120 apart. Magnetic priming was demonstrated to increase the percentage of pi-mode shots by 15% over the baseline case. Mean peak power for -mode shots was found to be higher in the magnetically primed case by almost a factor of two. Increases in mean microwave pulsewidth were also observed in the magnetically primed case when compared to the unprimed case (66-ns primed versus 50-ns unprimed). Magnetron starting current for the magnetically primed pi-mode exhibited a reduction to 69% of the unprimed baseline starting current.

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Plasma Science, IEEE Transactions on  (Volume:36 ,  Issue: 3 )