Kinetic characteristics of ions in the gas discharge and on the target surface

Abstract

The drift velocities of ions in a constant homogeneous electric field are calculated using Monte Carlo simulations for noble-gas and some metal vapors. The ion mobility is analyzed as a function of the field strength and gas temperature. A general approximate formula for the dependence of the drift velocity on the reduced field and gas temperature is derived. The results of calculations of kinetic characteristics of ions crossing the surface of the target are presented. The authors focus on the angular and energy distributions of ions and differences between the distributions of the average volume and the average flow on the surface.

Method of Control of Ion Drag Force in Complex Plasmas

“…The measured dependences of angular velocity displaying a variation of ion drag force at using of mixture of gases are well agreed with simulation model [14][15][20][21][22][23][24][25][26][27].…”

“…It is possible to conclude that the parameters of dust structures in the mixture are agreed qualitatively with calculations [14][15][16][17][18][19][20][21][22][23][24][25][26][27]. It gives the chance to create the dust plasma with new properties (for example, with a demanded anisotropy and a density of packing in the crystal lattice of the plasma crystal) changing longitudinal interpartial distance by means of gas additive.…”

“…For the chosen discharge conditions and composition of mixture the calculations of velocity of the ion fluxes and the electron temperature (for estimation of the charge of dust particles) were carried out. Here we didn't set as the purpose the description, the analysis and the simulation of all competing processes in a task of transfer of electrons and ions in the dc discharge with the lowered gas pressure; the results of simulation of discharge properties in the mixture of the helium with heavy gas for dust plasma are given in [27] partially. In our case the most essential factors are significant increase in a charge of a granule and strong anisotropy of ion distribution function.…”

“…Systematic investigations of influence of gas composition on characteristics of collisions of ions and electrons, parameters of their drift, a charging and an interaction between dust particles are contained in series of works [14][15][16][17][20][21][22][23][24][25][26][27]. Let us note some effects important for dust plasma obtained in them.…”

Explosive processes at cathode in the probe of gases in the external magnetic field and without it

“…В результате дрейфа пучка электронов в неизотермической плазме в зависимости от соотношения скорости дрейфа электронов υ и тепловой скорости электронов и ионов υ Те , υ Тi могут возбуждаться неустойчивости -ионно-звуковая или ионно-звуковая совместно с Бунемана [5,6].…”