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A quasi-linear theory of dissipative ion-acoustic instability

O.F. Kovpik, I.N. Onishchenko1973年Nuclear FusionIF 3出版社

The authors consider the instability of an electron beam in a plasma with a hot electron component. The presence of the beam means that waves with negative energy may be propagated through the plasma. If the pair collision frequency or the collisionless Landau damping decrement is greater than the beam growth rate, a dissipative instability is created in the plasma/cold beam system.They indicate the conditions under which the dissipative ion-acoustic instability originates, together with its growth rate and threshold excitation current. On the basis of quasi-linear theory equations, they derive the noise level created by development of the instability and also the distribution of the energy lost by the beam in terms of degrees of freedom (increase in the effective beam temperature and heat-up of electrons and plasma ions).

日本語訳

著者らは、高温電子成分を有するプラズマ中の電子ビームの不安定性について考察する。ビームの存在は、負のエネルギーを持つ波がプラズマ中を伝播し得ることを意味する。もし二体衝突周波数または無衝突ランダウ減衰の減衰率がビームの成長率よりも大きい場合、散逸性不安定性がプラズマ/冷ビーム系において生じる。著者らは、散逸性イオン音波不安定性が発生する条件を、その成長率および励起閾値電流とともに示す。準線形理論の方程式に基づき、著者らは不安定性の発展によって生じるノイズレベルと、ビームが失うエネルギーの分布を、自由度の観点から導出する(実効的なビーム温度の上昇およびプラズマイオンの加熱とプラズマ電子の加熱)。

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Ion acoustic wave
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