Production Of Dusty Plasma And Research On The Characteristics

Polar mesosphere belongs to weakly ionized dust plasma area where often have a strong radar echo phenomenon.The ionosphere is a rough inhomogeneous body with turbidity and the electron concentration has fluctuations and deviations in the ionosphere.In this paper,the influence of the effective collision frequency taking dust particles into account on the conductivity of parallel,Hall,Pedersen and Colin is analyzed,and the statistical results of experimental data are given.The influence of charging on dielectric coefficient during the process of dusty plasma scattering is discussed,and the simulation results of various parameters such as electron temperature,dust particle density and dust particle size are given.The relation between the electron concentration fluctuation and the electron concentration deviation and the scattering cross section of the scattering inhomogeneity is deduced.The relationship between the frequency and volume reflectivity,the frequency and the cross section is verified by the observed data.The results show that the theoretical analysis is basically consistent with the experimental data.The volume reflectivity decreases with the increase of frequency,and the scattering cross section is inversely proportional to the four power of the frequency.The main contents of this paper are as follows:Firstly,the dusty plasma parameters and polar mesosphere summer echoes are simply introduced,and then the influence of effective particle collision frequency,considering the effect of dust particles on parallel,Hall,Pedersen and Colin conductivity are analyzed and the statistical results according to the experimental data are given.Secondly,the influence of charging process of electromagnetic waves in dusty plasma scattering on the dielectric is analyzed and expression of the radial dielectric constant is given.The simulation results of the change of the dielectric coefficient with the electron temperature,the density of the dust particles and the size of the dust particles are given.Then the turbidity of the ionosphere and the ratio of the heterozygosity to the inhomogeneous body are explained.The relationship between the electronic concentration fluctuation and the electron concentration deviation of the scattering inhomogeneous body is discussed.Then the derivation of the scattering cross section is also given.The relationship between the cross section and the frequency is analyzed.The relationship between frequency and volume reflectivity,frequency and the cross section is verified by experimental data,and the expression of reflectivity and frequency of the body is fitted.Finally,the main process and mechanism of gas discharge are explained,and the process of hollow cathode discharge is simulated by OOPIC software.The distribution of electron concentration,ion concentration,space potential and radial electric field at different time during the discharge process is given.A new type of plasma cathode electron gun is designed based on hollow cathode discharge.The specific structure of the electron gun and the working process of the electron gun are given.By calculating the electron gun can generate a cylindrical solid electron beam of 50?100Acm-2.Finally,the method of producing the dusty plasma is preliminarily expored.