In this paper, the nonlinear interaction between kinetic instabilities driven by multiple ion beams and magnetized electrons is investigated. Electron diffusion across magnetic field lines is enhanced by the coupling of plasma instabilities. A two-dimensional collisionless particle-in-cell simulation is performed accounting for singly and doubly charged ions in a cross-field configuration. Consistent with prior linear kinetic theory analysis and observations from coherent Thomson scattering experiments, the present simulations identify an ion-ion two-stream instability due to multiply charged ions (flowing in the direction parallel to the applied electric field) which coexists with the electron cyclotron drift instability (propagating perpendicular to the applied electric field and parallel to the $E\times B$ drift). Small-scale fluctuations due to the coupling of these naturally driven kinetic modes are found to be a mechanism that can enhance cross-field electron transport and contribute to the broadening of the ion velocity distribution functions.

中文翻译：

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由于漂移驱动的微不稳定性的耦合而产生的跨场电子扩散。

本文研究了由多个离子束驱动的动力学不稳定性与磁化电子之间的非线性相互作用。等离子体不稳定性的耦合增强了电子在磁场线上的扩散。进行了二维无碰撞单元格内粒子模拟，考虑了交叉场配置中的单电荷和双电荷离子。与先前的线性动力学理论分析和相干Thomson散射实验的观察结果一致，本模拟确定了与电子回旋加速器共存的多个带电离子（在平行于施加电场的方向上流动）导致的离子-离子两流不稳定性。漂移不稳定性（垂直于外加电场并平行于$Ë\times 乙$漂移）。人们发现，由于这些自然驱动的动力学模式的耦合而引起的小规模波动是一种可以增强跨场电子传输并有助于扩大离子速度分布函数的机制。