Launched Waves on a Beam-Plasma System

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Abstract
An unstable launched wave on a low-density, cold-electron-beam-plasma system grows and traps the beam electrons. Test waves at neighboring unstable frequencies are observed to stop growing where the beam is trapped and to exhibit amplitude oscillations that are coherent with the amplitude oscillations of the main wave. The behavior of the test wave is calculated by regarding it as a slow modulation of the main wave's amplitude and phase.