Abstract
The formation of a 1D chain-like structure of dust particles in a low-temperature argon plasma was studied. A new numerical model for calculation of the self-consistent spatial distribution of plasma parameters around a chain of dust particles was presented. The model described the motion of positively charged ions in the electric potential of several negatively charged dust particles, taking into account the action of an external electric field. The main advantage of the model was that the charges of the dust particles and the interparticle distances were determined self-consistently. As a result of numerical simulations, the dependencies of the spatial distributions of the plasma parameters (the densities of electrons and ions and the self-consistent electric potential) near the dust particles chain on the strength of the external electric field, an external force acted on the last particle, and the mean free path of the ions was determined. The obtained results made it possible to describe the process of the formation of chain-like structures of dust particles in discharge plasma.
Highlights
Dusty plasma is a complex medium observed experimentally by Langmuir at the beginning of the twentieth century [1]
This paper presents a new model, an extension of the previous model [38,39], which includes the calculation of the spatial distributions of plasma around the chain of dust particles, the self-consistent charging of several dust particles, and the calculation of the self-consistent interparticle distance in a finite chain of dust particles
This paper presented a novel numerical model that allowed to determine the plasma parameters near a finite chain of dust particles
Summary
Dusty plasma is a complex medium observed experimentally by Langmuir at the beginning of the twentieth century [1]. In references [31,32], a model was presented in which a thorough study of the dust particles interaction was performed on the basis of the potential that includes the analytical form of the dielectric constant In this model, the motion equations of an infinite chain of dust particles in subsonic and supersonic plasma flows were considered. DiP3D allows to calculate self-consistently the dust particle charging, elastic and resonant collisions of ions and electrons with neutral atoms, and even investigates the motion of ions and electrons in a magnetic field [36] Using this model for a collisionless plasma, the characteristics of the wake behind an isolated dust particle were determined depending on the ion flow velocity [33]. This paper presents a new model, an extension of the previous model [38,39], which includes the calculation of the spatial distributions of plasma around the chain of dust particles, the self-consistent charging of several dust particles, and the calculation of the self-consistent interparticle distance in a finite chain of dust particles
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