Physics – Optics
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988phrva..38.2552p&link_type=abstract
Physical Review A - General Physics, 3rd Series (ISSN 0556-2791), vol. 38, Sept. 1, 1988, p. 2552-2563.
Physics
Optics
45
Beam Plasma Amplifiers, Electrostatic Waves, Magneto-Optics, Plasma Interactions, Wave Packets, Cosmic Rays, Magnetohydrodynamic Stability, Perturbation Theory, Plasma Frequencies, Solitary Waves, Nonlinear Phenomena: Waves, Wave Propagation, And Other Interactions, Plasma Turbulence, Solitons, Bgk Modes, Particle Beam Interactions In Plasmas
Scientific paper
The dynamics of Langmuir wave packets were analyzed for a case of beam-plasma interaction where the beam starts from a strongly magnetized plasma region and travels through a medium that is less and less magnetized. It was found that the averaged Lagrangian method and the adiabatic perturbation method derived from the inverse scattering transform give exactly the same results, predicting the stability of the solitons as long as the electron gyrofrequency is greater than the plasma frequency (strong magnetic field), and the soliton instability against transverse self-modulation in the opposite case (weak magnetic field). These methods also make it possible to deduce the self-similar collapsing oblate cavitons in the latter case. A formula giving the power loss of the beam is derived.
Asseo Estelle
Pelletier Guy
Sol Hé&Lgrave
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