Abstract
This paper presents experimental results of the quasi isothermal expansion of a pulsed rf argon plasma (Prf ≈ 300 W) into a vacuum like environment. A fast (τopen < 200 µs) gas puffing system prevents significant ionization by energetic electron in the expansion region. Thus, the expansion is dominantly determined by ion dynamics. The spatio-temporal measurement of the ion saturation current indicates a preceding ion front entangled with a strong potential drop. This is in qualitatively good agreement with the predictions by Widner et al and Crow et al. Additionally, there is evidence for a supersonic ion population formed by acceleration of the background plasma by the by-passing ion front.
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