Non-Linear Phenomena in Beam-Plasma Interaction

概要

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A modulated weak electron beam is injected into a low-density diffused plasma and growth rates of convective instabilities are observed. The growth rates obtained experimentally are in pretty good agreement with those calculated from the dispersion relation including only the collisional damping effect if the beam density is relatively low. However, if the beam density is high, the experimental results conspicuously deviate from the calculated values. These results suggest that it becomes difficult for the amplified wave to maintain its coherence as the amplitude increases, and that such non-linear effect would cause breakdown of the amplified waves. The ratio I_1/I_0 is adopted as a measure of the threshold over which the non-linear effect becomes remarkable, where I_0 and I_1 are the zero-order and first order electron currents in the beam-plasma system respectively. As I_1/I_0 approaches unity breaking of the wave becomes observable.
社団法人日本物理学会の論文
1967-01-05