Classical and Anomalous Diffusion of an Afterglow Plasma

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Abstract
The decay times of weakly ionized helium afterglow plasmas have been measured for neutral gas pressures between 0.2 and 0.8 Torr and magnetic field strengths from 0 to 800 G. Thus the transition from the fieldfree ambipolar diffusion to anomalous diffusion was covered. The plasma was confined by a cylindrical microwave cavity built in such a way that the end plates could be allowed to float electrostatically. With floating end plates we observed nearly classical diffusion, whereas anomalous diffusion was obtained when the end plates were kept at the same potential as the cylinder.

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