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Cyclotron-Cherenkov and Cherenkov instabilities

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2 Author(s)
T. H. Kho ; Dept. of Phys., California Univ., Los Angeles, CA, USA ; A. T. Lin

The effect of the conventional Cherenkov instability on the cyclotron-Cherenkov maser is investigated for the case of a relativistic electron beam propagating along a background magnetic field in a dielectric using particle simulations. Both Cherenkov and cyclotron-Cherenkov instabilities are excited when the phase velocity of light in the dielectric is less than the beam velocity. It is demonstrated in the high-power regime, where the cyclotron-Cherenkov mode has the higher growth rate, that the Cherenkov mode has little effect on the nonlinear efficiency of the cyclotron-Cherenkov mode. High-efficiency is possible, confirming previous predictions based on single mode calculations. The effect of beam momentum spread is studied

Published in:

IEEE Transactions on Plasma Science  (Volume:18 ,  Issue: 3 )