Research On The Transmission And Incoherent Scattering Of Electromagnetic Waves In Dusty Plasma

Dusty plasma widely exists in interstellar space,the Earth's ionosphere,Earth's near-earth space,all kinds of gas discharge experiment,which is a partially or fully ionized plasma.Besides electrons and ions,its components also contained charged particles with varying charge numbers.The interaction of electromagnetic wave with this complex plasma presents many new physical phenomena.Based on plasma kinetic theory and incoherent scattering theory,the aim of this thesis is to study the electromagnetic characteristics in dust y plasma,mainly including the two aspects of the transmission characteristics of electromagnetic wave and characteristics of incoherent scattering in dusty plasma.The main work of the thesis is as follows:1.This chapter investigates the propagation characteristics of electromagnetic waves in fully ionized dusty plasmas.Starting from the Fokker–Planck–Landau(FPL)kinetic equationwhich is suitable forthe fully ionized plasmas at high density and low temperature,combined with the dust charging theory and the Orbit-Limited-Motion(OLM)theory,the complex dielectric relationship for the fully ionized plasmacontained only one type of electron and ion is computed.The reflection and transmission coefficients for a stratified media slab are calculated by using the propagation matrix method.The influence of varying the dust parameters on the propagation properties of electromagnetic waves in the fully ionized dusty plasma was analyzed using the FPL model.The propagation characteristics of fully ionized plasma with and without dust under the FPLand BGKmodels are compared to those of weakly ionized plasmas.2.This chapter investigates the propagation characteristics of electromagneticwavesin weakly ionized dusty plasmas.Starting from the kinetic equationthat includes the BGK(Bhatnagar-Gross-Krook)collision model,combined with and the charging equation of the statistical theory,the expression of complex dielectric permittivity for non-magnetized weakly ionized dusty plasma is established.Compared with the previouscomplex dielectric permittivityof weakly ionized plasmas,this expression takes the contribution of the second term of collision cross section to charging current when the minimum velocity is not equal to zero into account.These results are compared to those of weakly ionized plasmas under thepreviousapproximate solution by using the propagation matrix method.In the meanwhile the influences of density,average size of dust grains,and the balanced charge number of dust particles on the propagation properties of electromagnetic waves in weakly ionized dusty plasma are investigated.3.Based on Mie-Debye scattering model under plane wave scattering by single spherical dust particles,Mie cross section,the Debye cloud cross section,and interference cross section between the central particle and the Debye cloud around the particle are calculated by use of the Dyadic Green function,respectively.The impact of average size of dust grains,and the charge number of dust particles on scattering cross section and the regularity that scattering cross section of charged dust particle varies with incident wave frequency are analyzed.In terms of incoherent scattering in dusty plasma,the influence of charged dust particles is introduced into the theory of incoherent scattering.According to Shiffield's incoherent scattering theory,dust incoherent scattering theoretical model including the components of electrons,ions,and dust particles are given under two circumstances both collision and collision-free,respectively.And we further discusses the influences of the dust temperature,average size of dust grains,and density on the incoherent scatter spectral line structure both ion resonance region and dust resonance region under the maxwell distribution,and obtain the incoherent scattering echo characteristics associated withdusty plasma.