Zerguini Taha Houssine

• University of Sciences and Technology Houari Boumediene

The one‐dimensional dynamics of nonlinear electrostatic dust‐ion acoustic waves (DIAWs), in a plasma containing Kaniadakis‐distributed electrons, fluid ions, and variable‐charge dust grains has been investigated. The κ −generalized electron charging current is derived based on the orbit‐motion limited approach. The reductive perturbation technique...

The oblique propagation of low-frequency solitary waves is considered in a polarized magnetized complex plasma with adiabatically trapped nonthermalions. A Cairns–Gurevich distribution is adopted, and the polarization force associated with our plasma model is applied. In addition, the appropriate modified Korteweg–de Vries (mK-dV) equation, in whic...

The charge fluctuation induced solitary wave anomalous damping in a charge varying dusty plasma with ions following a Cairns–Gurevich distribution is investigated. To examine a such phenomenon, the exact Cairns–Gurevich ion charging current and the associated dust charge frequency are derived here for the first time. In addition, the appropriate mo...

The linear and weakly nonlinear dust-ion-acoustic wave propagation obliquely to an external magnetic field is studied in a magnetized dusty plasma which consists of magnetized fluid ions bearing with anisotropic pressure, suprathermal electrons, and static dust grains. In the linear regime, the magnetized dusty plasma supports the propagation of th...

The effects of the obliqueness and the strength of the external magnetic field on the propagation ion acoustic wave in a dusty plasma are investigated. The dispersion relation of the electrostatic wave is found to be modified by the Lorentz force. The reductive perturbation technique is used to derive the equation of propagation of the electrostati...

The Hamiltonian guiding center drift orbit formalism is used which permits the efficient calculation of ionic trajectories perturbed by a fast-wave in a stochastic magnetic …eld. The magnetic …field is assumed to be a small perturbation from a zero-order “"equilibrium”" fi…eld possessing magnetic surfaces, toroidal symmetry and modeled analytically...

Large amplitude ion-acoustic (IA) soliton in a fully relativistic plasma consisting of relativistic cold ions and relativistic degenerate electrons and positrons are investigated. It is shown that the features of IA soliton are strengthened increasingly with relativistic effects. The relativistic degeneracy of electrons and positrons acts in opposi...

Arbitrary amplitude dust-acoustic double-layers (DA-DLs) in a plasma with suprathermal electrons, two-temperature thermal ions, and warm drifting dust grains are investigated. Our results reveal that the spatial patterns of the DA-DLs are affected by the degree of the electron suprathermality. The electron thermalization involves a decrease of the...

Nonlinear dust-acoustic (DA) shock waves are addressed in a nonextensive dusty plasma exhibiting self-consistent nonadiabatic charge variation. Our results reveal that the amplitude, strength and nature of the DA shock waves are extremely sensitive to the degree of ion nonextensivity. Significant differences in the potential function occur for very...

A fully and coherent relativistic fluid model derived from the covariant formulation of relativistic fluid equations is used to study small but finite amplitude solitary waves. This approach has the characteristic to be consistent with the relativistic principle and consequently leads to a more general set of equations valid for fully relativistic...

The problem of nonlinear variable charge dust acoustic solitary waves in dusty plasma with relativistic electrons and ions is addressed. The appropriate relativistic charging currents, derived within the theoretical framework of the orbit-limited motion theory, are used. Our results show that in such a plasma, rarefactive spatially localized dust a...

The existence of arbitrary amplitude dust acoustic solitary waves is investigated in an unmagnetized dusty plasma comprising a negatively charged dust fluid, superthermal electrons, and nonthermal ions having a κ-vortex-like velocity distribution function. It is shown that due to electron and ion superthermality, the present dusty plasma model may...

Our recent analysis [Tribeche M, Zerguini TH, Aoutou K. Nonlinear oscillations in dusty plasmas in the presence of nonisothermal trapped electrons. Phys Plasmas 2003;10:631] is extended to include self-consistently the dust charge variation. The grain charge becomes a new self-consistent dynamical variable, leading to some new and interesting resul...

A theoretical model is presented to show the existence, formation, and possible realization of large-amplitude dust-acoustic solitary potentials in electron-depleted hot dusty plasma with trapped ions. These nonlinear localized structures are self-consistent solutions of the Vlasov equation in which the ion response is non-Maxwellian due to the ion...

The one-dimensional quantum hydrodynamic model for a three-species quantum plasma is used to study the quantum counterpart of the well known dust ion-acoustic (DIA) wave. Two cases of physical interest are investigated, namely positive and negative dust charge. It is shown that only rarefactive solitary potentials associated with nonlinear quantum...

A theoretical model is presented to show the existence, formation, and possible realization of arbitrary amplitude solitary potentials in a dusty plasma with both nonthermal and superthermal electrons. A physically meaningful κ-like electron distribution function is outlined. It is shown that due to electron superthermality, the present dusty plasm...

The recent analysis of dust voids (Mamun, A. A. and Shukla, P. K. 2005 J. Plasma Phys. 71, 143) is extended to include self-consistent electron trapping and dust charge variation. It is found that under certain conditions the effect of dust charge variation can be quite important. In particular, it may be noted that the dust charge variation leads...

Large-amplitude electrostatic solitary structures are investigated in an unmagnetized charge-varying pair-ion-dust plasma in which electrons and positrons have equal masses. Their spatial patterns are significantly modified by the presence of the positron component. In particular, it may be noted that an addition of a small concentration of positro...

A numerical investigation is presented to show the existence, formation and possible realization of large amplitude solitary potentials in a charge varying dusty plasma with two-temperature trapped ions. These nonlinear localized structures are self-consistent solutions of the Vlasov equation representing saturated states of a four-stream unstable...

Nonlinear large amplitude plasma voids are investigated in a charge-varying dusty plasma. Numerical solutions of highly nonlinear equations are carried out including dust charging and ion trapping. The results complement previously published results on this problem. It is found that under certain conditions the effect of dust charge variation can b...

The recent analysis of dust voids [A. A. Mamun and P. K. Shukla, Phys. Plasmas 11, 1757 (2004)] is extended to include self-consistently the dust charge variation. Numerical solutions of highly nonlinear equations are carried out including dust charging and dust trapping. It is found that under certain conditions the effect of dust charge variation...

Small amplitude electrostatic solitary Bernstein–Greene–Kruskal (BGK) waves are investigated in an unmagnetized thermal charge-varying dusty plasma. The well-known pseudopotential analysis is used. It is found that under certain conditions spatially localized structures, the height and nature of which depend sensitively on the plasma parameters, ca...

The comments [R. Annou, Phys. Plasmas 11, 4151 (2004)] are unfounded and are shown to be based on the complete misunderstanding of our article by the author. The claim of an incorrect analysis is strongly refuted and firmly rejected.

The nonlinear space–time evolution of an expanding electron depleted dusty plasma into a vacuum region is numerically investigated without imposing the quasineutrality approximation. Based on hydrodynamic equations a Lagrangian algorithm is developed. A small group of dust particles is accelerated ahead of the dominant plasma expansion by a local e...

The expansion of a nonideal dusty plasma is investigated. The nonideal effects are modelled by a van der Waals equation of state, where the coefficients are calculated for each intergrain potential. It is found that the nonideal character of the expansion is still relevant for submicron sized grains. When a realistic intergrain potential that takes...

The nonlinear coupling between large amplitude Langmuir waves and dust ion-acoustic waves in a charge-varying dusty plasma is considered. By employing a two-time-scale three fluid approach, modified Zakharov equations are derived. A normal mode analysis of these nonlinearly coupled equations is performed to obtain a general dispersion relation that...

The recent analysis of the excitation of new dust Bernstein–Greene–Kruskal (DBGK) modes in a noncollisional dusty plasma [Tribeche et al., Phys. Plasmas 7, 4013 (2000)] is extended to include self-consistently the effects of trapped electrons. A kinetic analysis is presented. Highly nonlinear differential equations are obtained and solved numerical...

Nonlinear dust Bernstein–Greene–Kruskal (BGK) modes are investigated in a charge-varying dusty plasma. It is found that highly localized structures, solely due to the dust charge variation, can exist. The dust BGK soliton suffers the well-known anomalous damping, the importance of which is roughly proportional to the dust grain velocity. This dissi...

A cold kinetic model for stationary one-dimensional electrostatic oscillations in a collisionless dusty plasmas with variable grain charge was considered. The Bernstein-Greene-Kruskal (BGK) modes for untrapped particles for untrapped particles were identified. The appearance of soliton mode that was not present in the fixed-charge problem was inves...

Recent analysis of the excitation of dust Bernstein–Greene–Kruskal modes [Tribeche et al., Phys. Plasmas 7, 4013 (2000)] is extended to include self-consistently the dust charge variation. The grain charge becomes a new self-consistent dynamical variable, leading to some new and interesting results such as threshold lowering, mode damping, and spat...

It is known that the wavefront of a shock wave in a shock tube becomes unstable at particular Mach numbers and unperturbed gas pressure. This instability leads to the distortion of the wave front, i.e. particular Mach numbers define a threshold beyond which the wavefront is no longer plane (see Annou and Ferhat 1997, and references therein). In a r...

The expansion of a dusty plasma into a vacuum with a variable charge is considered self-consistently. Due to the plasma spatial finitude, loss terms are introduced in fluid equations. Particles attachment also imposes that the Boltzmann distribution be relaxed. A nonlinear differential equations system is obtained and solved numerically. A breakdow...

The extended fluid analysis of the excitation of dust ion-acoustic waves (DIAWs) in a collisional dusty plasma [Merlino, IEEE Trans. Plasma Sci. 25, 60 (1997)] is reconsidered to include self-consistently the fluctuations in the charges of the dust grains, which liberate or capture electrons and protons. The numerical results show that the dust cha...

Gravitational-electromagnetic entities geons are singularity-free solutions of the Einstein-Maxwell equations. These structures in cylindrical symmetry are considered here through the noncompactified Kaluza-Klein theory which describes geometrically the gravitation field and its sources.

A kinetic analysis of the excitation of dust BGK(Bernstein-Greene-Kruskal) modes in a collisional dusty plasma is presented. It is found that in the case where all the electrons are attached to the dust particles, consequent modifications in the nonlinear electrostatic potential structure can significantly influence the existence and properties of...

The stochastic acceleration of ions by a coherent lower hybrid wave in a tokamak plasma(1) in the presence of magnetic field stochasticity is studied. The guiding center motion of a single ion is given by the four hamiltonian drift equations in magnetic coordinates(2) for the standard model of the tokamak magnetic field.(4) The evolution equations...

Summary form only given. The Hamiltonian guiding center drift orbit formalism is used which permits the efficient calculation of ionic trajectories perturbed by a fast-wave in a stochastic magnetic field. The magnetic field is assumed to be a small perturbation from a zero-order “equilibrium” field possessing magnetic surfaces, toroidal symmetry an...

The accumulated experimental results from tokamak experiments during the last two decades support the fact that RF heating at ion cyclotron frequency and lower hybrid heating of ions provide an efficient way to heat tokamak plasmas. Previous work has shown that ions are accelerated by the lower hybrid wave through a collisionless stochastic process...

A perturbation method is developed to find solutions of sloshing ion distributions. This method uses an expansion in the ratio of electrostatic potential to average ion energy to simplify the bounce-averaged Fokker-Planck equation. Finite element techniques, which provide rapid numerical solutions for parametric studies of sloshing ions, are used t...

Sloshing ion distributions are a crucial feature in the end cells of recent tandem mirror reactor designs. They provide the ambipolar potentials that confine central ions and often have the function of making the electron thermal barrier with a potential shape that traps enough cold ions at the midplane for the stabilization of loss cone modes. A p...

Charge fluctuations of impurities in the form of heavy ions are considered. In this case we solve the problem for a parametric excitation of a simple resonance for an especially simple case, where there is two ordinary waves participating in the three-wave interaction with an extraordinary wave. In our study we follow the parametric approach studie...