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Modulational instability in the beat-wave generation

  • D. Pesme (a1), S. J. Karttunen (a2), R. R. E. Salomaa (a3), G. Laval (a1) and N. Silvestre (a1)...

Abstract

The coupling of a large amplitude plasmon, generated by the beat-wave process, to ion acoustic waves may lead to modulational or decay instabilities, which are investigated here. A general dispersion relation obtainable from Zakharov equations predicts large growth rates (∼ωpi) for short wavelength modulations. To avoid these, extremely short pulse lengths are required in the beat-wave experiments. Due to the very long wavelength of the beat-plasmon, the decay instability is not likely below the ke V-temperatures.

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Modulational instability in the beat-wave generation

  • D. Pesme (a1), S. J. Karttunen (a2), R. R. E. Salomaa (a3), G. Laval (a1) and N. Silvestre (a1)...

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