Influence of external perturbations on dynamical characteristics of dust clusters (simulation)
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TICAL, NONLINEAR, AND SOFT MATTER PHYSICS
Influence of External Perturbations on Dynamical Characteristics of Dust Clusters (Simulation) E. A. Lisin* and O. S. Vaulina** Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya ul. 13, Moscow, 125412 Russia *Email: [email protected] **Email: [email protected] Received April 27, 2012
Abstract—The results of a numerical study of the dynamics of interacting particles in cluster systems under the action of an external perturbing field on them are presented. The relaxation rates and characteristic relax ation times of a cluster to its equilibrium state are analyzed. The conditions for the formation of dynamical structures of charged particles in the field of external nonpotential forces are investigated. The peculiarities of diagnosing the pair potential of particles in nonequilibrium systems are considered. The numerical simu lation conditions for the problem were close to the conditions of experiments in a dusty plasma. DOI: 10.1134/S1063776112110064
1. INTRODUCTION Investigating the influence of external perturbations on nonideal systems of interacting particles is of consid erable interest in various fields of science and engineer ing (plasma physics, medical industry, polymer physics and chemistry, etc.) [1–5]. Several questions are of spe cial interest from scientific and practical viewpoints: the relaxation dynamics of a system of particles after an external perturbation to its equilibrium state; the condi tions for the formation of various dynamical (for exam ple, vortex) structures; the redistribution of the kinetic energy of interacting particles in an external force field. Considerable attention is given to the development of new efficient methods of diagnostics that allow the interaction potential between the particles of a system to be determined irrespective of the degree and way of its perturbation and to the conditions for a proper application of the existing methods of diagnostics to analyze strongly nonisotropic media. Information about the interparticle interaction potential is needed to analyze various thermodynamic and physical char acteristics of systems (such as the pressure, internal energy, compressibility, etc.) and to calculate various kinetic coefficients (for example, the viscosity, ther mal conductivity, electrical conductivity, etc.) [5–7]. A laboratory dusty plasma is a good experimental model for investigating the properties of nonideal dissi pative systems. A dusty plasma is an ionized gas contain ing micrometersize charged particles (dust, macroparti cles). Such a plasma is widespread in nature and is formed in a number of technological processes [3–5]. Most of the experiments to study the properties of a dusty plasma are carried out in gas discharges of various types. A significant fraction of the analytical models pro posed for laboratory gasdischarge plasma conditions
are based on a consistent solution of the Poisson equa tion and the kinetic equation for the ion component of an isotropic pl
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