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Screened Coulomb potential in a flowing magnetized plasma

J-P Joost, P Ludwig, H Kählert, C Arran, M Bonitz2015年Plasma Physics and Controlled FusionIF 2.2出版社

The electrostatic potential of a moving dust grain in a complex plasma with magnetized ions is computed using linear response theory, thereby extending our previous work for unmagnetized plasmas (Ludwig et al 2012 New J. Phys.14053016). In addition to the magnetic field, our approach accounts for a finite ion temperature as well as ion-neutral collisions. Our recently introduced code Kielstream is used for an efficient calculation of the dust potential. Increasing the magnetization of the ions, we find that the shape of the potential crucially depends on the Mach number M. In the regime of subsonic ion flow (M < 1), a strong magnetization gives rise to a potential distribution that is qualitatively different from the unmagnetized limit, while for M > 1 the magnetic field effectively suppresses the plasma wakefield.

日本語訳

移動するダスト粒子の静電ポテンシャルを、磁化されたイオンを有する複合プラズマ中において線形応答理論を用いて計算し、これにより非磁化プラズマに関する我々の先行研究(Ludwig et al 2012 New J. Phys. 14 053016)を拡張する。磁場に加えて、我々の手法は有限のイオン温度およびイオン-中性粒子衝突も考慮する。我々が最近導入したコードKielstreamを、ダストポテンシャルの効率的な計算に用いる。イオンの磁化を増加させると、ポテンシャルの形状がマッハ数Mに決定的に依存することが分かる。亜音速イオン流(M < 1)の領域では、強い磁化は非磁化極限とは質的に異なるポテンシャル分布を生じさせる一方、M > 1では磁場がプラズマ航跡場を効果的に抑制する。

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