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Confinement and turbulent transport in a plasma torus with no rotational transform

K Rypdal, E Gronvoll, F Oynes, A Fredriksen, R J Armstrong, J Trulsen, H L Pecseli1994年Plasma Physics and Controlled FusionIF 2.2出版社

In the BLAAMANN device a weakly ionized hydrogen plasma is produced by electrons accelerated from a hot, negatively biased tungsten filament and confined in a toroidal magnetic field of strength up to 0.4 T. The plasma is turbulent, with relative fluctuation levels in ne, phi and Te of 10% or more. The time-averaged state exhibits nested toroidal surfaces of constant potential and pressure, which requires an anomalous cross-field current to remove the space-charge injected by the cathode and the charge accumulated due to the Del B- and curvature drifts. Typical plasma parameters are ne approximately 1016 m-3, Te approximately 1-20 eV, Ti approximately 1 eV. The cross-field diffusion coefficient is typically Dperpendicular to approximately 30 m2 s$ -1 approximately 104*Dperpendicular to classical approximately 101*Dperpendicular to Bohm. Evidence is presented in support of the hypothesis that the plasma goes turbulent because it needs to develop an anomalous current channel, and this turbulence in turn determines the plasma transport and the time-averaged state.

日本語訳

BLAAMANN装置では、高温の負にバイアスされたタングステンフィラメントから加速された電子によって生成され、最大0.4 Tのトロイダル磁場中に閉じ込められた弱電離水素プラズマが生成される。このプラズマは乱流状態にあり、ne、φ、Teの相対揺動レベルは10%以上である。時間平均された状態は、等電位面と等圧面が入れ子状のトロイダル面を呈しており、これはカソードによって注入された空間電荷と、∇Bドリフトおよび曲率ドリフトによって蓄積された電荷を除去するために、異常な横断方向電流を必要とする。典型的なプラズマパラメータは、ne ≈ 10^16 m^-3、Te ≈ 1〜20 eV、Ti ≈ 1 eVである。横断方向拡散係数は典型的にD⊥ ≈ 30 m^2 s^-1であり、これは古典拡散係数の約10^4倍、ボーム拡散係数の約10倍に相当する。プラズマが異常電流チャネルを必要とするために乱流状態になるという仮説を支持する証拠が提示され、この乱流がプラズマ輸送と時間平均状態を決定づけていることが示される。

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