Nonlinear Right-Hand Polarized Wave in Plasma in the Electron Cyclotron Resonance Region

The propagation of a nonlinear right-hand polarized wave along an external magnetic field in subcritical plasma in the electron cyclotron resonance region is studied using numerical simulations. It is shown that a small-amplitude plasma wave excited in low-density plasma is unstable against modulati...

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Bibliographic Details
Published in:Plasma physics reports 2018-05, Vol.44 (5), p.507-513
Main Authors: Krasovitskiy, V. B., Turikov, V. A.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Atomic
Computer simulation
COMPUTERIZED SIMULATION
Cyclotron resonance
ELECTRIC FIELDS
ELECTRON CYCLOTRON-RESONANCE
Electron energy
ELECTRON TEMPERATURE
ELECTRONS
LASER RADIATION
LASERS
MAGNETIC FIELDS
Magnetic resonance
MODULATION
Molecular
Nonlinear Phenomena
NONLINEAR PROBLEMS
Optical and Plasma Physics
Physics
Physics and Astronomy
Plasma
PLASMA DENSITY
PLASMA INSTABILITY
PLASMA WAVES
Radiation absorption
Stability
Wave propagation
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Summary:The propagation of a nonlinear right-hand polarized wave along an external magnetic field in subcritical plasma in the electron cyclotron resonance region is studied using numerical simulations. It is shown that a small-amplitude plasma wave excited in low-density plasma is unstable against modulation instability with a modulation period equal to the wavelength of the excited wave. The modulation amplitude in this case increases with decreasing detuning from the resonance frequency. The simulations have shown that, for large-amplitude waves of the laser frequency range propagating in plasma in a superstrong magnetic field, the maximum amplitude of the excited longitudinal electric field increases with the increasing external magnetic field and can reach 30% of the initial amplitude of the electric field in the laser wave. In this case, the energy of plasma electrons begins to substantially increase already at magnetic fields significantly lower than the resonance value. The laser energy transferred to plasma electrons in a strong external magnetic field is found to increase severalfold compared to that in isotropic plasma. It is shown that this mechanism of laser radiation absorption depends only slightly on the electron temperature.
ISSN:1063-780X
1562-6938
DOI:10.1134/S1063780X18050082