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A brief summary of some new computations of the incremental propagation constants for a traveling-wave tube is presented in the form of graphs. The data includes values of the wave growth factor x1for larger values of the loss parameterd. The computations for large values of the space-charge parameterQCand of the gain parameterChave revealed an anomalous propagation region for negative ranges of the velocity parameter b, which shows the transition from resistive-wall type interaction to the usual traveling-wave tube type interaction.
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Brewer et al. (1957) studied this question.
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