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Effect of ion-neutral collisions on the evolution of kinetic Alfvén waves in plasmas

R Goyal, R P Sharma2018年Plasma Physics and Controlled FusionIF 2.2出版社

This paper studies the effect of ion-neutral collisions on the propagation of kinetic Alfvén waves (KAWs) in inhomogeneous magnetized plasma. The inhomogeneity in the plasma imposed by background density in a direction transverse as well as parallel to the ambient magnetic field plays a vital role in the localization process. The mass loading of ions takes place due to their collisions with neutral fluid leading to the damping of the KAWs. Numerical analysis of linear KAWs in inhomogeneous magnetized plasma is done for a fixed finite frequency taking into consideration the ion-neutral collisions. There is a prominent effect of collisional damping on the wave localization, wave magnetic field, and frequency spectrum. A semi-analytical technique has been employed to study the magnetic field amplitude decay process and the effect of wave frequency in the range of ion cyclotron frequency on the propagation of waves leading to damping.

日本語訳

本論文は、不均一磁化プラズマ中の運動論的アルフヴェン波(KAW)の伝播に対するイオン-中性粒子衝突の影響を研究するものである。周囲の磁場に対して横方向および縦方向の密度によって課されるプラズマの不均一性は、局在化過程において重要な役割を果たす。イオンの質量付加は、中性流体との衝突によって生じ、KAWの減衰をもたらす。不均一磁化プラズマ中の線形KAWの数値解析は、イオン-中性粒子衝突を考慮した固定有限周波数に対して行われる。衝突減衰は、波動の局在化、波動磁場、および周波数スペクトルに対して顕著な影響を及ぼす。半解析的手法を用いて、磁場振幅の減衰過程と、イオンサイクロトロン周波数範囲における波動周波数が減衰をもたらす波動伝播に及ぼす影響を研究した。

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Alfvén waveKinetic Alfvén wave
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