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Investigation of structured microwave discharge based on data from the scattered radiation

The development of a microwave discharge is accompanied by noticeable scattering of the incident electromagnetic field. The scattered radiation includes information about the time evolution of the discharge formation and its integral parameters. In this work a method of diagnostics using scattered radiation to study a single thin plasma channel (plasmoid, plasma dipole) and corresponding experimental results in air within the pressure range P  =  70–150 Torr are presented. A simple analytical model for analysis of the experimental results of microwave scattering from a plasmoid is proposed. Information concerning the average elongation velocity of the plasma channel in the direction parallel to the incident electric field and the induced dipole moment of the plasmoid is obtained. Based on information about the dipole moment as well as the form and sizes of the plasma dipole the effective cross section, the total charge, the current averaged over the channel length, the plasma density and conductivity averaged over the channel volume, the electric field amplitude in the central region of the channel and the absorbed power are estimated. The estimated value of the plasma density is shown to agree with experimental results obtained using spectroscopic methods.