A parametric mechanism that can tailor the shape of a modulated intense relativistic electron beam was found. This mechanism is highly efficient in up-conversion of the fundamental frequency of the current modulation to the second and third harmonics. It is shown in this Letter that the parametric mechanism is the result of a nonlinear capacitance that appeared when a quasi-dc high-density electron beam traversed a high-voltage gap.
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Friedman et al. (1985) studied this question.
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