Abstract
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 ( 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.
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