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

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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 1014 cm−3 density and 2×105°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.

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