Instability and damping of one-dimensional large-amplitude plasma waves
Journal Article
·
· Sov. J. Plasma Phys. (Engl. Transl.); (United States)
OSTI ID:5865066
Numerical simulations have been carried out by the particle-in-cell method for the instability and damping of one-dimensional plasma waves in the region E/sup 2//sub 0//8..pi..nT>m/M>(k/sub 0/r/sub d/)/sup 2/. The simulations were carried out over a broad range of initial wave properties E/sup 2//sub 0//8..pi..nTapprox.4 x 10/sup -2/--10/sup 2/, v/sub Phi//v/sub T/approx.3--160, and M/m = 10/sup 2/ or, in certain cases, M/m = 10/sup 3/. The most important processes are the modulational instability, with a modulation length shorter than the wavelength; wave conversion at a density inhomogeneity (the process l/sub k//sub 0/+s/sub k//sub i/ ..-->.. l/sub k//sub 0//sub plus-or-minusbetak//sub i/, where ..beta.. = 1, 2, 3, . . .); and the trapping of electrons by the wave or by its harmonics. One or another of these processes will be predominant, depending on the initial properties of the wave. In the region of linear waves, E/sup 2//sub 0//8..pi..nT<10/sup -3//(k/sub 0/r/sub d/)/sup 2/, the modulational instability is predominant; in the region E/sup 2//sub 0//8..pi..nTk/sub 0/r/sub d/ it leads to collapse. All three processes play comparable roles in the region 4 x l0/sup -2//(k/sub 0/r/sub d/)/sup 2/>E/sup 2//sub 0//8..pi..nT>10/sup -3// (k/sub 0/r/sub d/)/sup 2/. In the strong-damping region, E/sup 2//sub 0//8..pi..nT>4 x 10/sup -2//(k/sub 0/r/sub d/)/sup 2/ the leading role is played by the trapping of electrons by the wave, which results in a damping much stronger than Landau damping.
- Research Organization:
- Institute of Nuclear Physics, Siberian Branch, Academy of Sciences of the USSR
- OSTI ID:
- 5865066
- Journal Information:
- Sov. J. Plasma Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Plasma Phys. (Engl. Transl.); (United States) Vol. 7:2; ISSN SJPPD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107 -- Fusion Energy-- Plasma Research-- Instabilities
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
COLLISIONLESS PLASMA
DAMPING
ELECTRONS
ELEMENTARY PARTICLES
EQUATIONS
FERMIONS
INHOMOGENEOUS PLASMA
INSTABILITY
KINETIC EQUATIONS
LANDAU DAMPING
LEPTONS
NONLINEAR PROBLEMS
ONE-DIMENSIONAL CALCULATIONS
PARAMETRIC INSTABILITIES
PLASMA
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
PLASMA SIMULATION
PLASMA WAVES
QUASI PARTICLES
SIMULATION
SOLITONS
TRAPPED ELECTRONS
700107 -- Fusion Energy-- Plasma Research-- Instabilities
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
COLLISIONLESS PLASMA
DAMPING
ELECTRONS
ELEMENTARY PARTICLES
EQUATIONS
FERMIONS
INHOMOGENEOUS PLASMA
INSTABILITY
KINETIC EQUATIONS
LANDAU DAMPING
LEPTONS
NONLINEAR PROBLEMS
ONE-DIMENSIONAL CALCULATIONS
PARAMETRIC INSTABILITIES
PLASMA
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
PLASMA SIMULATION
PLASMA WAVES
QUASI PARTICLES
SIMULATION
SOLITONS
TRAPPED ELECTRONS