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In the small-cold-beam limit, the beam-plasma instability is identical to the interaction in a traveling wave tube. We built a traveling wave tube to investigate the late-time development of this instability. We observe five trapped-particle oscillations following the saturation of a single launched wave. These oscillations can be destroyed either by increasing the wave damping or by modulating the main wave with unstable test waves.
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Dimonte et al. (1977) studied this question.
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