Showing papers on "Dusty plasma published in 1998"
TL;DR: In this article, the influence of strong correlations on low frequency collective modes in a dusty plasma is investigated, and it is shown that strong correlations lead to new dispersive corrections, an overall reduction of the frequency and phase velocity and the existence of parameter regions where ∆/∆k < 0.
Abstract: The influence of strong correlations on low frequency collective modes in a dusty plasma is investigated. The dust dynamics is modeled by the generalized hydrodynamics description. For the well known dust acoustic mode, strong correlations lead to new dispersive corrections, an overall reduction of the frequency and phase velocity and the existence of parameter regions where ∂ω/∂k<0. A novel result is the possibility of sustaining a low frequency transverse mode—a dust shear mode—in which the correlation energy acts as an effective bulk modulus. The influence of ion streaming and collisional interaction with a background of neutrals on the modes are also studied and it is shown that the longitudinal modes may be driven unstable by ion streaming.
325 citations
TL;DR: In this paper, the dynamics of the formation of ordered structures of macroparticles charged by photoemission under the action of solar radiation under microgravitational conditions without the use of electrostatic traps to confine the particles is studied experimentally and theoretically.
Abstract: The dynamics of the formation of ordered structures of macroparticles charged by photoemission under the action of solar radiation under microgravitational conditions without the use of electrostatic traps to confine the particles is studied experimentally and theoretically The working conditions needed for the formation of structures of charged macroparticles are chosen as a result of a numerical solution of the problem posed, the particle charges and the interparticle interaction parameter are determined, and the characteristic times specifying the dynamics of the formation of an ordered system of macroparticles are calculated The behavior of an ensemble of macroparticles under the effect of solar radiation is observed experimentally on board the Mir space station An analysis and comparison of the results of the experimental and theoretical investigations permit drawing a conclusion regarding the possibility of the existences of extended ordered formations of macroparticles charged by photoemission under microgravitational conditions
187 citations
TL;DR: In this paper, the mechanisms of simple hexagonal Coulomb crystalline formations are discussed, with the wake potential taken into account, and it is shown that a particle located in the upper stream of ion flows caused an attractive force on another particle located on the lower reaches of them.
Abstract: Optical manipulations have been attempted to analyze attractive forces between particles in a simple hexagonal Coulomb crystal of a dusty plasma. This technique can manipulate particles in a plasma without contact with them directly, using the forces of radiation pressure from laser light. In the Coulomb crystal, particle rows, which are found in the direction perpendicular to an electrode, are formed due to not only Coulomb repulsive force but also some attractive forces. The manipulation method showed that a particle located in the upper stream of ion flows caused an attractive force on another particle located in the lower reaches of them. The fact implied that the force was caused by a wake potential related to ion flows in the presheath or sheath region. In this paper, the mechanisms of simple hexagonal Coulomb crystalline formations are discussed, with the wake potential taken into account.
175 citations
Abstract: Using the standard reductive perturbation technique, a nonlinear Schr\"odinger equation is derived to study the modulational instability of finite amplitude dust-acoustic (DA) and dust-ion-acoustic (DIA) waves against oblique perturbations (with respect to the propagation direction of the carrier waves) in an unmagnetized dusty plasma. It is shown that both the DA and DIA waves are modulationally unstable. Possible stationary states of the wave packets can appear as envelope solitons.
160 citations
Book•
01 Jan 1998
TL;DR: Pines as discussed by the authors describes the nature of a charged particle motion fluid and describes the drift model of a plasminar model and the cold plasma model, and describes binary collision collisions and Turbulent Transport.
Abstract: Foreword by David Pines The Nature of Plasma Charged Particle Motion Fluid Description of a Plasma The Cold Plasma Model and Waves MHD and the Drift Model Vlasov Description of a Plasma Binary Collisions Collisional Transport Turbulent Transport.
159 citations
TL;DR: In this article, the lattice structure of dusty-plasma Coulomb crystals formed in rectangular conductive grooves as a function of plasma temperature and density has been studied, and a simple phenomenological model was proposed to explain the intergrain spacing.
Abstract: We have studied the lattice structure of dusty-plasma Coulomb crystals formed in rectangular conductive grooves as a function of plasma temperature and density. The crystal appears to be made of mutually repulsive columns of grains confined by the walls of the groove. The columns are oriented along the direction of the electrode sheath electric field. A simple phenomenological model wherein the intergrain spacing results from an attractive electric-field-induced dipole-dipole force balanced by a repulsive monopole Coulomb force is consistent with observed features of the Coulomb crystal. {copyright} {ital 1998} {ital The American Physical Society}
120 citations
TL;DR: In this paper, the effect of ion drag on negatively charged dust grains is considered as a possible mechanism of excitation of the dust-acoustic ionization instability, and it is found that DA waves are more and more damped as the coefficient for ion drag, μ, increases from zero to a critical value, μcrit.
Abstract: The effect of ion drag on negatively charged dust grains is considered as a possible mechanism of excitation of the dust-acoustic (DA) ionization instability. It is found that DA waves are more and more damped as the coefficient for ion drag, μ, increases from zero to a critical value, μcrit. For μ>μcrit a zero-frequency (nonpropagating) perturbation grows when the drag of the ions on the dust grains overcomes the effect of the perturbation electric field.
92 citations
76 citations
TL;DR: In this article, the instability of obliquely propagating electrostatic solitary structures in a magnetized three-component dusty plasma, which consists of a negatively charged dust fluid, Blotzmann distributed electrons, and free as well as fast ions, was investigated.
Abstract: A theoretical investigation has been made of instability of obliquely propagating electrostatic solitary structures in a magnetized three-component dusty plasma, which consists of a negatively charged dust fluid, Blotzmann distributed electrons, and free as well as fast ions. The Zakharov–Kuznetsov equation for these electrostatic solitary structures that exist in this plasma system is derived and their three dimensional instability is studied by the small-k (long-wavelength plane wave) perturbation expansion method. The instability criterion and its growth rate depending on the magnetic field and the propagation directions of the solitary waves are discussed. The implications of these results to some space and astrophysical plasma situations are briefly mentioned.
75 citations
TL;DR: In this article, a theoretical investigation of the nonlinear propagation of dust-acoustic waves in a magnetized three-component dusty plasma consisting of a negatively charged dust fluid, free electrons and vortex-like distributed ions is made.
Abstract: A theoretical investigation has been made of the nonlinear propagation of dust-acoustic waves in a magnetized three-component dusty plasma consisting of a negatively charged dust fluid, free electrons and vortex-like distributed ions. It is found that, owing to the departure from the Boltzmann ion distribution to a vortex-like one, the dynamics of small- but finite-amplitude dust-acoustic waves in a magnetized dusty plasma is governed by the modified Korteweg–de Vries equation. The latter admits a stationary dust-acoustic solitary-wave solution that has larger amplitude, smaller width and higher propagation velocity than that involving adiabatic ions. The effects of external magnetic field, trapped ions and free electrons on the properties of these dust-acoustic solitary waves are briefly discussed.
69 citations
TL;DR: In this article, the electrostatic interaction potential energy for two Debye shielded macroscopic grains or impurities is obtained for all values of intergrain separation both in the plasma as well as in the sheath.
01 Jan 1998
TL;DR: In this paper, a theoretical analysis of the nonlinear propagation of dust-acoustic waves in a magnetized three-component dusty plasma consisting of a negatively charged dust fluid, free electrons and vortex-like distributed ions is presented.
Abstract: A theoretical investigation has been made of the nonlinear propagation
of dust-acoustic waves in a magnetized three-component dusty plasma consisting
of a negatively charged dust fluid, free electrons and vortex-like distributed ions. It
is found that, owing to the departure from the Boltzmann ion distribution to a vortex-like
one, the dynamics of small- but finite-amplitude dust-acoustic waves in
a magnetized dusty plasma is governed by the modified Korteweg–de Vries
equation. The latter admits a stationary dust-acoustic solitary-wave solution that
has larger amplitude, smaller width and higher propagation velocity than that involving
adiabatic ions. The effects of external magnetic field, trapped ions and
free electrons on the properties of these dust-acoustic solitary waves are briefly discussed.
TL;DR: In this article, it was shown that EDC waves can be driven in the presence of an equilibrium ion streaming in a magnetized dusty plasma, which could be responsible for the generation of periodic wake potential behind a test dust charge.
TL;DR: In this article, the authors considered the kinetic equations for an interacting dust system with external time-dependent forces from the Born-Bogolyubov-Green-Kirkwood-Yvon equations.
Abstract: The kinetic equations for an interacting dust system with external time-dependent forces is considered from the Born–Bogolyubov–Green–Kirkwood–Yvon equations. A kinetic equation is obtained by writing the two-particle distribution function as a product of two one-particle distribution functions and the equilibrium radial distribution function. It is shown that a Vlasov-like equation is recovered with a collision term which is a functional of the pair correlation function. Wave behavior from the corresponding fluid equations is considered for a dusty plasma. The results are in qualitative agreement with previously obtained dispersion relations based on generalized hydrodynamics and the quasilocalized charge approximation.
TL;DR: In this article, the amplitude of the linear and nonlinear dust-acoustic waves in inhomogeneous dusty plasmas consisting of electrons, ions, and charged dust particles is investigated.
Abstract: The propagation of linear, as well as nonlinear, dust-acoustic waves in inhomogeneous dusty plasmas consisting of electrons, ions, and charged dust particles is investigated. It is shown that the amplitude of the dust-acoustic waves is affected by the presence of the dust density inhomogeneity. Amplitudes of the linear and nonlinear dust-acoustic waves decrease (increase) as the waves propagate in the direction of increasing (decreasing) density. The wave amplitude is inversely proportional to the square root of the dust particle’s density for the linear dust-acoustic waves. In the nonlinear case, to the lowest order and for the cold dust species, the wave amplitude is found to be directly proportional to nd0−1/4. Various special cases are explicitly considered, and comparison with the corresponding results for the usual two-component electron-ion plasmas is also carried out.
TL;DR: In this article, a new formalism, known as the tanh method and stemming from the modified simple wave solution technique, has been developed for finding the soliton propagation in the nonlinear plasma wave dynamics.
Abstract: In a sequel to a recent work [Das, Sarma, and Talukdar, Phys. Plasmas 5, 63 (1998)], the different nonlinear plasma-acoustic waves, based on the fluid approximation, have been derived showing the coexistences of dust-acoustic waves in plasmas contaminated by dust-charged grains. The features of the nonlinear waves, depending on the plasma composition, describe various natures of solitary waves. A new formalism, known as the tanh method and stemming from the modified simple wave solution technique, has been developed for finding the soliton propagation in the nonlinear plasma wave dynamics. The method is straightforward, with minimal mathematical manipulation, finding the heuristic formation and propagation of ion-acoustic solitary waves in the dusty plasma. The main aim is, based on the tanh method, to revisit the results in a simpler case and extending them to explain the behavior of higher-order nonlinear waves derived in generalized multicomponent plasmas. The theoretical observations highlight the sal...
TL;DR: In this article, a rigorous theoretical investigation has been made of obliquely propagating dust-acoustic solitary structures in a cold magnetized two-ion-temperature dusty plasma consisting of a negatively charged, extremely massive, cold dust fluid and ions of two different temperatures.
Abstract: A rigorous theoretical investigation has been made of obliquely propagating dust-acoustic solitary structures in a cold magnetized two-ion-temperature dusty plasma consisting of a negatively charged, extremely massive, cold dust fluid and ions of two different temperatures. The reductive perturbation method has been employed to derive the Korteweg-de Vries (K-dV) equation which admits a solitary wave solution for small but finite amplitude limit. It has been shown that the presence of second component of ions modifies the nature of dust-acoustic solitary structures and may allow rarefactive dust-acoustic solitary waves (solitary waves with density dip) to exist in such a dusty plasma system. The effects of obliqueness and external magnetic field on the properties of these dust-acoustic solitary structures are also briefly discussed.
TL;DR: The nonlinear properties of solitary wave structures in the presence of nonisothermal ions, electrons, and charged dust grains are investigated in this article. But the authors do not consider the effects of reflected ions and charged sand grains.
Abstract: The nonlinear properties of solitary wave structures in the presence of non-isothermal ions, electrons, and charged dust grains are reported. The modification in the amplitude and the width of the solitary wave structures due to the inclusion of the effects of reflected ions and charged dust grains are investigated.
TL;DR: The theory of ion-acoustic surface wave propagation on the interface between a dusty plasma and a dielectric is presented in this article, where both the constant and variable dust-charge eases are considered.
Abstract: The theory of ion-acoustic surface wave propagation on the interface between a dusty plasma and a dielectric is presented. Both the constant and variable dust-charge eases are considered. It is found that massive negatively charged dust grains can significantly affect the propagation and damping of the surface waves. Application of the results to surface-wave generated plasmas is discussed.
TL;DR: In this article, a theoretical analysis of the dynamics of dust-acoustic solitary waves in an unmagnetized three-component dusty plasma is presented, which consists of a negatively charged dust fluid, free electrons and trapped as well as free ions.
Abstract: A theoretical investigation has been made of dust-acoustic solitary waves in an unmagnetized three-component dusty plasma which consists of a negatively charged dust fluid, free electrons and trapped as well as free ions. It is found that owing to the departure from the Boltzmann ion distribution to a trapped ion one, the dynamics of small but finite amplitude dust-acoustic waves is governed by a modified Korteweg-de Vries equation. The latter admits a stationary dust-acoustic solitary wave solution which has larger amplitude, smaller width, and higher propagation velocity, than that involving adiabatic ions. The effects of trapped ions and free electrons on these dust-acoustic solitary waves are discussed. The present investigation should be useful in understanding some nonlinear features of the dust-acoustic waves which have been observed in a recent numerical simulation study.
TL;DR: In this paper, the dispersion relation for surface waves propagating on an interface between a dusty plasma and a vacuum is derived and their connection to surface waves in general two-ion-species plasmas is analyzed.
Abstract: Wave propagation in a dusty, magnetized, strongly inhomogeneous plasma at frequencies below the ion–cyclotron frequency, and near the dust cyclotron frequency, is considered. The dust grains are assumed to carry a proportion of the negative charge of the plasma. Wave resonances and cutoffs in a homogeneous plasma are discussed. The dispersion relation for surface waves propagating on an interface between a dusty plasma and a vacuum is derived and studied, and their connection to surface waves in general two-ion-species plasmas is analyzed. The damping of the waves due to Alfven resonance absorption in a narrow but nonzero width interface is derived, and it is shown that for a range of frequencies above the dust cyclotron frequency the surface wave can propagate undamped by resonance absorption.
TL;DR: In this article, the effects of dust temperature, fast ions, and external magnetic field have been found to modify the criterion for this gravitational instability in a self-gravitating magnetized hot dusty plasma, where the gravitational force is comparable to or greater than the electrostatic force.
Abstract: A theoretical investigation has been made of effects of dust temperature, fast (nonthermal) ions, and external magnetic field on gravitational instability in a self-gravitating magnetized hot dusty plasma, which consists of extremely massive, negatively charged hot dust fluid, nonthermally distributed ions, and Boltzmann distributed electrons, where the gravitational force is comparable to or greater than the electrostatic force. The effects of dust temperature, fast ions, and external magnetic field have been found to modify the criterion for this gravitational instability. It has been shown that the growth rate of this gravitational instability decreases with dust temperature, fast ions, and external magnetic field, but increases with the number of free electrons, with the ratio of ion temperature to electron temperature, and with the ratio of dust mass to dust charge. The implications of this result in some astrophysical situations are briefly discussed.
TL;DR: In this article, the authors studied the nonlinear behavior of low-frequency dust acoustic instability in a collisional dusty plasma by means of particle simulations and found that the instability arises due to the streaming of plasma ions and neutrals relative to charged dust grains.
Abstract: We study the nonlinear behavior of the low-frequency dust acoustic instability in a collisional dusty plasma by means of particle simulations. The instability arises due to the streaming of plasma ions and neutrals relative to charged dust grains. According to linear theory, the presence of collisions between the plasma ions and a neutral gas background reduces the growth rate of the instability. Nonlinearly, however, the presence of drifting neutrals maintains the initial relative drift between plasma and dust ions until the unstable waves grow to large amplitude and collisions due to wave-particle interactions exceed the neutral collisions. As a result, stronger nonlinear effects, as manifested by enhanced fluctuations, larger amounts of plasma and dust heating, and a temporary reduction of the relative drift velocity, can occur in the presence of collisions.
TL;DR: In this paper, the authors consider two ways of countering the gravitational collapse: (i) via the excitation of dust-acoustic modes and (ii) via a novel Alfven-Jeans instability, where perturbations of the dust massloaded magnetic field counter the effects of self-gravitation.
TL;DR: In this article, the nonlinear propagation of coupled Langmuin and dust acoustic waves in a multi-component dusty plasma is considered, and exact analytical solutions for the coupled waves having single-, double-and triple-hump structures for the Langmuir field intensity are also derived, and are solved approximately.
Abstract: The nonlinear propagation of coupled Langmuin and dust acoustic waves in a multi-component dusty plasma is considered. The coupled mode propagation is deseribed by a Schrodinger Boussinesq system, which reduces to the Schrodinger -KdV system for unidirectional wave propagation. For stationary propagation, the coupled waves are governed by a generic Hamiltonian that is integrable in both sub- and the supersonic regimes of Mach number. Depending on the parameter regimes, exact analytical solutions for the coupled waves having single-, double- and triple-hump structures for the Langmuir field intensity are obtained. The exact governing equations for large-amplitude waves are also derived, and are solved approximately. The existence conditions for large-amplitude localized solutions in the quasineutral limit are discussed.
TL;DR: In this paper, it was shown that dust-neutral and ion-neutral drags can produce instabilities of electrostatic waves in multicomponent self-gravitating dusty plasmas.
Abstract: It is shown that dust-neutral and ion-neutral drags can produce instabilities of electrostatic waves in multicomponent self-gravitating dusty plasmas. Explicit expressions for the growth rates of the instabilities are presented. The relevance of our investigation to fragmentation of molecular dust clouds is discussed.
TL;DR: In this paper, the effect of charged dust on the Farley-Buneman instability was investigated, and it was shown that in certain regimes, the critical drift can decrease as the charge density carried by negatively charged dust increases.
TL;DR: In this paper, two dusty plasmas are considered in more detail, namely a comet tail plasma and one which may be produced in a laboratory device of the type described by Xu et al. (1992).
TL;DR: In this paper, a theoretical analysis for negatively biased single and double spherical probes in a plasma is presented, assuming that the motion of ions with respect to the probes is radial and that the plasma electron distribution function is Maxwellian.
Abstract: In this paper a theoretical analysis for negatively biased single and double spherical probes in a plasma is presented. It is assumed that the motion of ions with respect to the probes is radial and that the plasma electron distribution function is Maxwellian. Photoemission from the probes and secondary electron emission are not taken into account. The analysis provides a tool which may be used to derive plasma parameters directly from experimentally obtained double probe characteristics. In addition the analysis is applied to the case of an isolated negatively charged dust grain in a plasma. The probe theory indicates that the charge on such a dust grain, in a hydrogen or argon plasma at floating potential, is approximately the same as the charge that the grain would have in a vacuum, for the case in which the grain's radius is less than or approximately equal to one tenth of the Debye length of the ambient plasma. At larger values of the grain radius the charge on the grain increases with the grain radius.
TL;DR: In this paper, the analytical and numerical results for the slowing down of two heavy projectile ions passing through a multicomponent dusty plasma are presented within the linear dielectric approach, the electrostatic potential and stopping power of the two projectiles are computed for different values of KD (the normalized effective wave number) and R (the separation between the two ions) retaining two-ion correlation effects.
Abstract: The analytical and numerical results for the slowing down of two heavy projectile ions passing through a multicomponent dusty plasma are presented. Within the linear dielectric approach, the electrostatic potential and the stopping power of the two projectiles are computed for different values of KD (the normalized effective wave number) and R (the separation between the two projectiles) retaining two-ion-correlation effects. The enhancement in the energy loss is observed, and it is compared with that of a single ion projectile case. These results are useful to explain the crystallization of dust grains in astrophysical and laboratory plasmas.