Dispersion and spectral characteristics of crossfield instability in collisional magnetoplasma |
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Authors: | Y C Saxena P I John |
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Institution: | (1) Physical Research Laboratory, 380009 Ahmedabad |
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Abstract: | Results on dispersion and spectral characteristics of crossfield instability in a collisional magnetoplasma are presented
for different values of externally applied radial electric field. The dispersion relation obtained experimentally differs
significantly from predictions of linear theory for strong electric fields.K-spectra for density and potential fluctuations follow power law with indices (−3·7 ± 0·5) and (−5·6 ± 0·6) respectively.
At large values of applied electric fields, the main crossfield modes appear to give rise to a number of other modes possibly
through non-linear wave-wave interactions. Large amplitudem = 2 mode displays strong sidebands indicating particle trapping by the non-linear waves. Non-linear wave-wave and wave particle
interactions, thus, appear to play at important role in the saturation of the cross field instability. |
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Keywords: | Crossfield instability wave-wave interactions particle trapping |
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