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Collisionless expansion of pulsed rf plasmas

机译:脉冲射频等离子体的无碰撞膨胀

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摘要

This paper presents experimental results of the quasi isothermal expansion of a pulsed rf argon plasma (P_(rf) ≈ 300W) into a vacuum like environment. A fast (τ_(open) < 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.
机译:本文介绍了脉冲rf氩等离子体(P_(rf)≈300W)到真空状环境中的准等温膨胀的实验结果。快速的(τ_(open)<200μs)气体吹气系统可防止膨胀区中的高能电子引起明显的电离。因此,膨胀主要由离子动力学决定。离子饱和电流的时空测量表明前面的离子前沿缠结有很强的电位降。这在质量上与Widner等人和Crow等人的预测吻合良好。另外,有证据表明通过旁路离子前沿加速背景等离子体形成了超音速离子群。

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