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Experimental investigation of ion-acoustic double-layers in the electron flow across multidipole magnetic fields

J L Ferreira, G O Ludwig, A Montes1991年Plasma Physics and Controlled FusionIF 2.2出版社

In the experiment, a cold electron flow is produced across the multidipole field of a magnetic fence. For electron flow velocities above the ion-acoustic speed ( nu d>Cs), generation of ion-acoustic instability is observed beyond the magnetic sheath region of the fence. The anomalous resistivity associated with the turbulence is large enough to give rise to a plasma potential jump over a long distance (L>> lambda D), known as a double-layer. The anomalous particle transport process leading to the formation of the small-amplitude double-layer is related to a bootstrap mechanism.

日本語訳

実験において、冷たい電子流が磁気フェンスの多極磁場を横切って生成される。電子流の速度がイオン音波速度を超える場合(ν_d > C_s)、フェンスの磁気シース領域を越えてイオン音波不安定性の発生が観測される。この乱流に伴う異常抵抗は、長距離にわたるプラズマ電位の跳躍(L >> λ_D)を生じさせるのに十分な大きさであり、これは二重層として知られている。小さな振幅の二重層の形成につながる異常粒子輸送過程は、ブートストラップ機構に関連している。

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Ion acoustic waveDouble layer
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