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Drift instabilities of a magnetized turbulent plasma

E.N. Krivorutsky, V.G. Makhankov, V.N. Tsytovich1969年被引用 14Nuclear FusionIF 3出版社

The authors investigate the influence of a developed high-frequency plasma turbulence on the spectrum and build-up of drift oscillations. It is shown that, even in the case of relatively weak turbulence, W/n0 Te ≪ 1 (W being the turbulence energy), there is a critical value Wcr such that when W > Wcr the spectrum and build-up of drift oscillations change radically. When W > Wcr, high-frequency turbulence may lead to stabilization of drift oscillations for large temperature gradients (d ln T/d ln n0 > 2). The analysis is limited by the assumption that the plasma electrons are magnetized, which means that a drift kinetic equation can be used in describing them. The authors consider the role of both potential and non-potential turbulent pulsations at frequencies of the order ωpe = (4π n0 e2/me)½ and the limiting cases of isotropic andone-dimensional turbulence. A new class of turbulent-plasma instabilities with non-linear drift is found.

日本語訳

著者らは、発達した高周波プラズマ乱流がドリフト振動のスペクトルと成長に及ぼす影響を調査する。比較的弱い乱流の場合、W/n0 Te ≪ 1(W は乱流エネルギー)であっても、臨界値 Wcr が存在し、W > Wcr のときドリフト振動のスペクトルと成長が根本的に変化することが示される。W > Wcr のとき、高周波乱流は大きな温度勾配(d ln T/d ln n0 > 2)に対してドリフト振動の安定化をもたらす可能性がある。解析は、プラズマ電子が磁化されているという仮定に限定される。すなわち、電子を記述する際にドリフト運動方程式を用いることができることを意味する。著者らは、ωpe = (4π n0 e2/me)½ のオーダーの周波数を持つポテンシャルおよび非ポテンシャル乱流振動の役割と、等方的および一次元乱流の極限の場合を考察する。非線形ドリフトを伴う新しいクラスの乱流プラズマ不安定性が見出される。

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