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Plasma electric noise of a steady hf discharge in a magnetic field

V.L. Vdovin, V.D. Rusanov, D.A. Frank-Kamenetsky1966年被引用 1Nuclear FusionIF 3出版社

The plasma is produced by magneto-acoustic techniques in a glass tube situated in a constant magnetic field. The plasma flows out continuously along the axis into the measuring chamber at whose centre the magnetic field varies from 700 to 2500 Oe. A hydrogen plasma was studied at pressures of (5 to 1) × 10−3 Torr. The active high-frequency power put into the discharge was 4 kW. The temperature of the electrons varied from 4 to 10 eV, and the electron concentration at the centre of the chamber was 1 × 1010 to 4 × 1012 cm−3. The density of the plasma and the temperature of the electrons were determined mainly by electric probes. Further, the density and temperature of the electrons were checked by a microwave technique (for which the Fabry-Perot interferometer was used) as well as by optical methods.In the range from 10 to 200 kHz, intensive (∼1 V) electric noise with first-harmonic frequencies of several tens of kHz was discovered and investigated by means of dual electric and capacitative and double capacitative probes. The relationship between this noise and the plasma parameters was studied, and discussed from the point of view of the "universal" plasma instability.

日本語訳

プラズマは、一定磁場中に置かれたガラス管内で磁気音響法により生成される。プラズマは軸に沿って測定チャンバー内へ連続的に流出し、その中心では磁場は700~2500 Oeで変化する。水素プラズマを(5~1)×10−3 Torrの圧力で研究した。放電に投入された有効高周波電力は4 kWであった。電子温度は4~10 eVの範囲で変化し、チャンバー中心における電子濃度は1×1010~4×1012 cm−3であった。プラズマの密度と電子温度は主に電気プローブによって決定された。さらに、電子の密度と温度は、マイクロ波技術(そのためにファブリ・ペロー干渉計が用いられた)および光学的方法によっても確認された。10~200 kHzの範囲において、数十kHzの第1高調波周波数を持つ強い(∼1 V)電気ノイズが、二重電気プローブと容量プローブ、および二重容量プローブを用いて発見され、調査された。このノイズとプラズマパラメータとの関係が研究され、「普遍的」プラズマ不安定性の観点から議論された。

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