Abstract
The temporal evolution of a wave packet in electron-beam-plasma is observed experimentally. It is shown that the packet develops on electron time scales not into self-contraction but into asymmetrical widening. Particle trapping, indicated the distribution function of electron-beam, plays an important role in causing this phenomenon. When the waves in an electron-beam-plasma system are strong, nonlinear phenomena characteristi- cally appear. In regard to this phenomena, it is important to discuss solitary waves or modulation instabilities (1). A. Y. Wong et al. (2) showed experimentally a 3-D Langmuir-wave collapse of ion time scales driven by a pulsed electron-beam. T. Intrator et al. (3) reported the longitudinal self-contraction of modulationally unstable electron wave packets developing on electron time scales. We (4) showed that a wave packet can be stabilized by emitting a series of several burst waves. In order to investigate nonlinear phenomena at long distances, we introduce a new beam-plasma device, the length of which is 2 times longer than that of the previous one. In this paper, we report the nonlinear behavior of the electron time scales of the packet in plasma, induced by a low density electron-beam, and the distribution function of the electron-beam.
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