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Nonlinear correlations in phase-space resolved fluctuations at drift wave frequencies

F Skiff, I Uzun, A Diallo2007年Plasma Physics and Controlled FusionIF 2.2出版社

In an effort to better understand plasma transport, we measure fluctuations associated with drift instabilities resolved in the ion phase-space. Primary attention is given to fluctuations near the electron drift frequency where there are two general components to the observed fluctuations. From two (spatial) point measurements of the ion distribution function with a variable separation along the magnetic field, a number of statistical measures of the fluctuations are calculated including cross-correlation and cross-bicoherence. Both fluid (ω/k ≫ vti) and kinetic (ω/k ∼ vti) components are observed in the fluctuations. The nonlinear interactions are found to depend strongly on the ion particle velocity.

日本語訳

プラズマ輸送をより深く理解するために、我々はイオン位相空間において分解されたドリフト不安定性に関連する変動を測定する。主な注目は、観測される変動に2つの一般的な成分が存在する電子ドリフト周波数付近の変動に置かれる。磁場に沿った可変分離距離を持つイオン分布関数の2点(空間的)測定から、相互相関および相互バイコヒーレンスを含む変動のいくつかの統計的指標が計算される。変動には、流体(ω/k ≫ vti)成分と運動論的(ω/k ∼ vti)成分の両方が観測される。非線形相互作用は、イオン粒子速度に強く依存することが見出される。

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Drift waves
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