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Test charge response and correlations in multi-ion plasmas

机译：多离子等离子体中的测试电荷响应和相关性

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摘要

The interaction potentials caused by a pair of moving test charges are studied in collisionless unmagnetized multi-ion plasmas, containing the electrons, singly ionized positive ions, and two negative ions. Starting from the Vlasov-Poisson coupled equations, a generalized electrostatic potential is obtained for a pair of test charges moving with constant velocities along the z-axis. Based on the speeds and correlations of test charges, the cases of slow, fast, and resonating test charge response are specifically studied and analyzed. If the test charges move with velocities much slower than the thermal speeds of all plasma species in multi-ion plasmas, then a short-range Debye-Huckel (DH) shielding potential appears to decay exponentially with the distance, whereas the long-range far-field (FF) potential varies as the inverse cube of the distance from test charges. The shielding phenomenon does not occur if the test charges move much faster than the plasma thermal speeds. However, the oscillatory wakefield (WF) potentials only exist behind the test charges when their speeds resonate with the speed of ion-acoustic waves. Numerically, it is revealed that the profiles of DH, FF, and WF potentials are significantly affected by the multi-ion plasma parameters and correlation effects. The results might be helpful for understanding the shielding phenomena, particle-particle and wave-particle interactions in multi-ion laboratory plasmas. Published under license by AIP Publishing.
机译：由一对移动测试电荷引起的相互作用电位在碰撞的未磁化的多离子等离子体中研究，含有电子，单独电离正离子和两个负离子。从VLASOV-POISSON耦合方程开始，获得沿Z轴线的一对测试电荷的一对测试电荷获得广义的静电电位。基于测试电荷的速度和相关性，具体研究和分析了慢速，快速，谐振的测试充电响应的情况。如果测试电荷与速度比多离子等离子体中所有等离子体物种的热速度慢得多，那么短程的Deye-Huckel（DH）屏蔽电位似乎与距离指数衰减，而远距离远距离-FIELD（FF）电位随着测试电荷的距离的反式立方体而变化。如果测试电荷移动比等离子热速度快得多，则不会发生屏蔽现象。然而，当它们的速度以离子声波的速度谐振时，振荡唤醒场所（WF）电位仅存在于测试电荷后面。在数值上，揭示了DH，FF和WF电位的轮廓受到多离子等离子体参数和相关效果的显着影响。结果可能有助于了解多离子实验室等离子体中的屏蔽现象，粒子粒子和波粒相互作用。通过AIP发布在许可证下发布。

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