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The beat-wave excitation of plasma waves in a counterstreaming electron beam is studied, and the consequences for particle acceleration are discussed. Both the plasma-wave length and the pump-depletion length can be significantly longer than that in the plasma beat-wave accelerator. Thus the single-stage energy gain of the accelerated particles is greatly increased, whereas the injection energy for particle trapping is greatly reduced; this allows the possibility of ion acceleration.
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Yan et al. (1987) studied this question.
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