Filamentary Collapse in Electron-Beam Plasmas

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Abstract
Observations of a form of three-dimensional turbulence, which occurs in beam-plasma interactions, are described. Large amplitude, beam driven instabilities in both the oblique electron plasma and electron-cyclotron modes are shown to collapse into thin, magnetic field aligned filaments, and to exhibit a variety of modulation time scales characteristic of both electron and ion modes in the system. On the largest time scales, associated density depletions are observed.