磁場中プラズマの拡散と低用波振動

概要

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The diffusion rate of ions in a plasma is studied with-respect to a longitudinal magnetic field in the range 0-1, 000 gauss (lower than the critical field for screw instability) from measurement of the diffusion current on the wall of the discharge tube.<BR>Comparing with the classical ambipolar diffusion theory, a small deviation is found when the magnetic field comes to a certain value.<BR>In addition, we investigated an oscillation of the plasma in a magnetic field.<BR>As a result of these studies, it is turned out that the plasma becomes unstable suddenly to produce low frequency oscillations at a certain magnetic field where enhancement of the diffusion coefficient appears.<BR>It seems to suggest that there is another kind of critical magnetic field for instability under the critical field for screw instability.
社団法人プラズマ・核融合学会の論文