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ABSTRACT: This paper considers the anomalous growth of the radiation intensity, which is caused by an EM wave incident on an inhomogeneous non-stationary plasma. The amplitude of the reflected signal can thus during relatively short time intervals be larger than that of the incident wave. The reason is that the plasma parameters can pass through values, for which linear resonance of leaking surface waves exist. An analytical expression is obtained for the maximum value of the intensity of the reflected wave for two different plasma density profiles, interacting with waves of different polarization. It is shown that the effect can occur repeatedly in a nonstationary plasma with a nonmonotonous density profile, if the region, where the inhomogeneity gradient changes sign, increases.
Physica Scripta 01/2007; 22(2):151. · 1.20 Impact Factor
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ABSTRACT: The stimulated scattering of strong radiation by the low-frequency ion-sound oscillations (Brillouin scattering) as well as by the longitudinal surface modes of a plasma slab is considered. It is shown that the leaking eigenmodes of the slab then can be excited. The scattered wave intensity, taking into account the generation of harmonics, is also calculated.
Physica Scripta 12/2006; 28(2):214. · 1.20 Impact Factor
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ABSTRACT: Considering a plasma slab we show that electromagnetic field perturbations, which within linear theory are identified as leaking modes, can appear in the form of solitary waves that propagate along the slab.
Beiträge aus der Plasmaphysik 03/2006; 25(6):593 - 596.
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ABSTRACT: We consider the resonant absorption of surface waves in a cold electron plasma by taking into account the nonlinear change in the electron density profile which is caused by the wave pressure in the transition layer. Equations, which describe the time evolution of the amplitudes of the electric fields of the surface waves, are obtained and solved. It is shown that the time-behaviour of the surface waves can be significantly different from that obtained from linear theory, and nonlinear effects can thus change the rate of absorption of the surface wave energy and can also stabilize linear surface wave instabilities.
Beiträge aus der Plasmaphysik 03/2006; 20(2):77 - 81.
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ABSTRACT: A new mechanism for the nonlinear transparency of a bounded plasma is considered. The incident electromagnetic wave is supposed to decay into quasistatic eigenmodes which can propagate around the overdense region. Most of the transformed energy can be reradiated in specific directions from the particular plasma surface regions where the plasma parameters have proper values. The stationary state, that is established when the power of the induced radiation is equal to that of the incident, is also studied.
Plasma Physics 12/2000; 25(9):1051.
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ABSTRACT: The electrostatic surface waves in a cold bounded plasma have been studied for the case where the plasma density is non-uniform in a direction which is parallel to the boundary. It is shown that the eigenmode spectrum then is discrete. The eigenfrequencies, which are functions of the density gradient, are calculated for plane as well as cylindrical geometries. Special attention is paid to the particular case where the density profile is linear.
Plasma Physics and Controlled Fusion 12/2000; 26(5):759. · 2.42 Impact Factor
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ABSTRACT: Direct subharmonic wave generation in a nonuniform plasma is considered. That mechanism exists only when leaking surface waves can be parametrically excited. An expression for the instability growth rate, which includes collisions, resonance absorption and leaking losses is derived. A possibility of generating subharmonics at omega 0/4, 3 omega 0/4 and 5 omega 0/4, where omega 0 is the pump wave frequency is pointed out, and the corresponding field intensities are estimated. The conditions for total energy absorption are discussed and the pump wave intensity, which produces complete absorption, is obtained for a plasma with a steep density gradient.
Plasma Physics 12/2000; 22(7):727.
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ABSTRACT: A cold magnetized nonuniform plasma layer is considered in order to find out if it can be transparent to radiation as a consequence of parametric decay instability phenomena. The authors derive general expressions for a plasma with an arbitrary density profile, pointing out that the transmitted electromagnetic wave energy can be much larger than that obtained by means of linear theory. The results are then applied to a uniform plasma slab.
Plasma Physics 12/2000; 24(9):1101.
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ABSTRACT: The theory for nonlinear electrostatic surface waves on a cold semi‐infinite plasma is generalized. The deformation of the plasma surface due to the presence of a solitary wave is then determined.
Physics of Plasmas 07/1994; 1(8):2804-2805. · 2.15 Impact Factor
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ABSTRACT: Nonlinear surface wave propagation in a plasma slab is
investigated using a model in which the perpendicular fluid velocity
vanishes at the interface. It is shown that the nonlinear surface waves
can propagate as solitons
IEEE Transactions on Plasma Science 11/1993; · 1.17 Impact Factor
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ABSTRACT: The theory for high-frequency envelope solitons, propagating along a plasma cylinder, is generalized. It is then shown that previously neglected second harmonic terms are of the same order of magnitude as the nonlinear density terms, if the axial wavelength is comparable to, or larger than, the cylinder radius.
IEEE Transactions on Plasma Science 09/1986; · 1.17 Impact Factor
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ABSTRACT: We analyse high-frequency electrostatic solitary surface waves that propagate along a plasma cylinder in the presence of a constant axial magnetic field. The width of such a solitary wave, which is found to be inversely proportional to its amplitude, is expressed as a function of the magnitude of the external magnetic field.
Journal of Plasma Physics 01/1985; 33(01):53 - 58. · 0.94 Impact Factor
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ABSTRACT: The nonlinear properties of long-wavelength ion acoustic surface modes
in a semi-infinite plasma are studied. It is shown that finite-amplitude
surface-charge layers can propagate along the plasma boundary with a
velocity that exceeds the ion sound speed by a small term which is
proportional to the squared inverse width of the solitary layer.
Physical Review A 08/1984; 30:1531. · 2.88 Impact Factor
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ABSTRACT: We show that a solitary surface wave can exist at the boundary between a plasma and a dielectric, due to a balance between the nonlinear surface charge terms and the dispersive terms which here are caused by the presence of a high-frequency incident electromagnetic wave. The solitary wave propagation velocity, which depends on the intensity of the incident field, is also calculated.
IEEE Transactions on Plasma Science 01/1984; · 1.17 Impact Factor
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ABSTRACT: Surface solitons excited at the edge of a plasma sheet can propagate
across the sheet along its surface and, depending on the parameters
chosen, collide with surface solitons at the edge. The strong electric
field created in such a collision may produce a spot of light. Attention
is given to surface solitons on a semi-infinite plasma, using cold
electron plasma equations. Because all characteristic times of the
processes in question are much smaller than the inverse ion plasma
frequency, the ions may be regarded as immobile. This situation is
relevant to a plasma bounded by a dielectric which prevents distortion
of the surface.
Physics of Fluids 05/1982; 25:983. · 1.93 Impact Factor
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ABSTRACT: The linear dispersive properties of the electron surface waves of a bounded plasma are considered by means of the cold fluid theory. Wave dissipation due to resonant absorption as well as leaking processes are discussed. A general method is introduced to describe the eigenmodes of a plasma with arbitrary boundary shape. A hydrodynamic fluctuation theory, which can be useful for plasma diagnostics, is also presented. By means of the eigenmode theory we then discuss total absorption of plasma radiation as well as superreflectivity processes.
Physics Reports.
