Faraday Rotation of a Microwave through a Lossy Plasma

概要

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The elliptically polarized Faraday effect appears, when microwaves are transmitted through lossy plasmas with magnetic fields. The detector signal of an electric field component of a wave through plasmas oscillates with the monotonous decrease of the plasma electron density, when the cyclotron frequency is higher than the applied frequency. The electron density and the collision frequency can be easily determined from the maxima and the minima of the detector signal. From the detected microwave signal through an afterglow plasma in a waveguide at pressures of 1.9 Torr and 5.0 Torr neon, the electron density which decays from 10^<12gt; to 10^9 cm^<-3> with time are determined for various magnetic fields from 3400 to 6000 gauss. These decays show reasonable values of the recombination coefficient during the later period, where the electron energy relaxes to the thermal equilibrium with the gas temperature and the recombination loss predominates over the diffusion loss. The collision frequencies of electrons with ions and neutral atoms are determined and plotted against the electron density. These values are somewhat higher than the theoretical ones.
社団法人応用物理学会の論文
1967-03-15