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Can the electrostatic ion-cyclotron instability by driven by a two-dimensional sheath?

R Schrittwieser, N Rynn, R Koslover, R Karim1984年Plasma Physics and Controlled FusionIF 2.2出版社

An experiment in a single-ended Q-machine was conducted in which a voltage was applied between two concentric floating electrodes which terminated the plasma column. When the inner electrode was more than 200 V positive with respect to the outer one the electrostatic ion-cyclotron instability was observed. In the usual case the electron current is drawn between the grounded (plasma generating) hot plate and a positively biased electrode, with only a small voltage needed to trigger the instability. However, the current threshold is the same for both cases, indicating that it is a critical electron drift speed, not a sheath effect, which is necessary for the instability.

日本語訳

単端Qマシンにおいて、プラズマ柱を終端する2つの同心浮遊電極間に電圧を印加する実験を行った。内側電極が外側電極に対して200V以上正となったとき、静電イオンサイクロトロン不安定性が観測された。通常の場合、電子電流は接地された(プラズマ生成用の)熱板と正にバイアスされた電極との間に流れ、不安定性を誘発するにはわずかな電圧で十分である。しかし、電流閾値は両方の場合で同じであり、不安定性に必要なのはシース効果ではなく、臨界電子ドリフト速度であることを示している。

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Plasma sheathCyclotron instability
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