Application of Microwave Beam Refraction in Inhomogeneous Plasma Interferometry

Abstract

The influence of metal impurities on the transport properties of multicomponent thermal plasma at the ambient atmosphere of water vapor has been considered. The calculations are carried out on the basis of the Grad method. It is shown that a small amount of metal impurities can substantially change the magnitude of transport coefficients in comparison with the case of pure water vapor. The influence of the model for the cross-section of electron collisions with a metal atom on the transport properties of thermal plasma is analyzed. K e y w o r d s: multicomponent plasma, underwater discharge, arc discharge, pulsed discharge, thermal conductivity of plasma, plasma conductivity.

Experimental Study of Inhomogeneous Reflex-Discharge Plasma Using Microwave Refraction Interferometry

“…In the case of cylindrical symmetry, Eq. (1) can be rewritten in the form [24] where is the cylinder radius, the current coordinate, ( ) the refractive index, Ψ the angle between the beam propagation direction and the cylinder radius at the point, where the beam falls on the plasma cylinder, and 0 is the beam trajectory turning point, which is determined from the condition…”

“…In works [23,24], a possibility to use the interferometry with ordinary oblique microwaves for measuring the density in various plasma layers was studied analytically and numerically. It was shown that this method allows the plasma density to be measured in separate layers, if the density profile has a maximum that is shifted from the axis, or if the transverse probing of a plasma formation is impossible.…”

“…The microwave scattering at fixed angles of about 60 and 120 ∘ was experimentally registered. The method of plasma interferometry with the use of oblique microwave beams, which was proposed in works [23,24], was experimentally tested in work [26]. It was shown that the average electron concentration in the peripheral layers of a plasma can be determined when the concentration of plasma for through probing exceeds the critical value.…”

Turbulence in Aqueous Glucose Solutions Induced by Magnetic Field

“…For this purpose, the plasma probing by frequency-modulated waves can be used. This method was applied in works [25,26] to diagnose quasistationary plasma.…”

Deformation of the emission line profile of optically dense spherical plasma caused by rotation of substance

“…For experimental determination of plasma rotation velocity, the methods of correlation microwave diagnostics and Doppler reflectometry [4], and also Doppler spectroscopy method [5], are used. When the input angle of a microwave or laser beam into plasma changes, the frequency shifts of a signal passing through various plasma layers are measured and a radial velocity profile is obtained.…”