Unstable whistler-wave propagation along the resonance cone in a large beam-plasma system

Physics

Scientific paper

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Electron Beams, Magnetohydrodynamic Stability, Plasma Resonance, Plasma-Particle Interactions, Wave Propagation, Whistlers, Cyclotron Resonance, Electron Radiation, Plasma Waves, Wave Attenuation, Wave Fronts

Scientific paper

A very-large-diameter uniform electron beam injected along a magnetic field into a dense background plasma was used to drive oblique whistler waves unstable; the whistler waves were in resonance with the beam and propagated nearly along the resonance cone angle. An axial interferometer trace showed a highly localized field for propagation against the beam but growing waves for propagation with the beam. A two-dimensional phase-front map showed a resonance cone pattern against the beam, and oblique waves with the beam. A contour map of rf amplitudes showed amplitude decay along the diverging cone opposing the beam, and oblique amplitude growth with the beam.

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