Density Distribution and Particle Diffusion in an Energetic Arc in a Magnetic Field

概要

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The effects of magnetic field and pressure on the radial distribution of plasma density are investigated experimentally for an energetic arc of 10^<14>cm^<-3> density and 2 × 10^5°K temperature in relation to the diffusion phenomena of plasma. Experiments are made in argon at pressures ranging from 3 × 10^<-2> to 3 × 10^<-5> torr and 1000〜4000 gauss of the magnetic field strength. Classical and Bohm type's diffusion coefficients were examined for two different states of plasma: One is with low ionization degree (<35%) and the other nearly fully ionized (>98%). The experimental results show that the e-folding length of the exponentially varying density-profile is inversely proportional to the magnetic field strength at 3 × 10^<-3> torr pressure, whereas to the square root of the strength at 3 × 10^<-5> torr pressure. This suggests that some types of turbulence would be produced in the fully ionized plasma of energetic arc.
社団法人日本物理学会の論文
1967-09-05