HARMONIC CURRENT GENERATION AND MULTI-SIGNAL EFFECTS IN BEAM-PLASMA SYSTEMS.
MICHIGAN UNIV ANN ARBOR ELECTRON PHYSICS LAB
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The interaction of a modulated electron beam with a plasma is studied by a general perturbation analysis of arbitrary order and arbitrary number of input signals. The analysis is limited to signal levels below those for which electron overtaking occurs and to two input signals and three orders of approximation in the numerical computation. The results for a single input signal include the beam and plasma current densities and their dependence on the axial distance, the depth of modulation and their distribution in phase over one r-f period. These are presented for the fundamental and the second and third harmonics. For two input signals, the cross-modulation and intermodulation terms are presented and indicate the relative effect of each signal on the other. In general, the results reflect the frequency dependence of the small-signal gain and show that the harmonics and distortions become significant as either of the input signals approaches its saturation level. It is also found that the plasma remains quite linear at signal levels for which the beam achieves significant nonlinearity. Author
- Electrical and Electronic Equipment
- Plasma Physics and Magnetohydrodynamics