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Parametric excitation of ion-sound instability in a magnetized plasma located in a high-frequency electric field

F.M. Nekrasov1969年被引用 9Nuclear FusionIF 3出版社

The author investigates the stability of a magnetized non-isothermal (Te ≫ Ti) plasma in an alternating electric field when the field frequency Ω0 is close to the frequency of the ion-sound oscillations of the plasma.The amplitude of the oscillatory velocity of electrons in a h.f. field is assumed to be small compared with their thermal velocity (u0 ≪ vTe). It is shown that, for perturbations with wave number kz satisfying the resonance condition there exists in such a plasma an instability with a growth rate .The width of the instability zone is determined in the kinetic and hydrodynamic approximations. In the hydrodynamic approximation, if one does not allow for dissipation, there is instability however small the value of . If one allows for collisionless kinetic damping of the oscillations on the electrons, the instability develops only when u0 exceeds come critical value ∼ vTe (me/Mi)¼.

日本語訳

著者は、電場周波数Ω0がプラズマのイオン音響振動の周波数に近いとき、交番電場中における磁化された非等温(Te ≫ Ti)プラズマの安定性を調べる。高周波場中の電子の振動速度の振幅は、その熱速度に比べて小さい(u0 ≪ vTe)と仮定される。共鳴条件を満たす波数k_zを持つ摂動に対して、そのようなプラズマには成長率の不安定性が存在することが示される。不安定領域の幅は、運動論的近似および流体力学的近似において決定される。流体力学的近似では、散逸を考慮しない場合、その値がどんなに小さくても不安定性が存在する。電子上の振動の無衝突運動論的減衰を考慮する場合、不安定性はu0がある臨界値 ∼ vTe (me/Mi)¼ を超えるときにのみ発生する。

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Magnetized plasma
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