具有离子尺度不均匀性的弗拉索夫等离子体中相空间涡旋的动力学：I 恒定频率驱动研究
Dynamics of phase space vortices in Vlasov plasmas with ion scale inhomogeneity : I Constant frequency drive study
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中文总结 AI 辅助
研究具有离子尺度不均匀性的弗拉索夫等离子体中相空间涡旋动力学，用VPPM - OMP 1.0求解器模拟，通过低振幅电场驱动创建QSIS不均匀性，观察离子俘获粒子不稳定性、模式转变等，施加EA扰动确定响应并报告关键观察结果。
中文摘要 AI 辅助
本文利用VPPM - OMP 1.0求解器的高分辨率弗拉索夫 - 泊松模拟，研究了在准静态离子尺度（QSIS）不均匀性存在的情况下，从各种相空间涡旋（PSV）或伯恩斯坦 - 格林 - 克鲁斯卡尔（BGK）结构（即电子声波（EAW）、朗缪尔（LAN）波）开始的形成动力学和稳定性。在一维、无碰撞、周期性、无磁化的等离子体中，用离子声（IA）频率的低振幅电场驱动创建QSIS不均匀性，证明了离子俘获粒子不稳定性（ITPI）的存在，观察到弛豫期从m = 2到m = 1的模式转变。最后施加尺度为k p = k min [m = 1]的电子声（EA）扰动以确定其在背景离子尺度不均匀性存在下的响应，并报告了一些关键观察结果。
英文摘要
Formation dynamics and stability starting from various phase space vortex (PSV) or Bernstein-Greene-Kruskal (BGK) structures i.e electron acoustic wave (EAW), Langmuir (LAN) waves is investigated in the presence of a quasi-stationary ion scale (QSIS) inhomogeneity using high resolution Vlasov-Poisson simulations with VPPM-OMP 1.0 solver. In a one dimensional, collisionless, periodic, unmagnetized plasma with kinetic ions and kinetic electrons, we first create a QSIS inhomogeneity using low amplitude electric field drive at ion acoustic (IA) frequency with k eq = mk min [where m = 2 is the mode number, k min corresponds to the longest scale in the system]. While creating QSIS inhomogeneity, we have demonstrated the existence of ion trapped particle instability (ITPI) which saturates as the amplitude of sideband modes become comparable to that of the primary nonlinear mode (quite analogous to the trapped particle instability in large amplitude electron plasma waves). Also, mode transition from m = 2 to m = 1 is observed during relaxation period due to the energy cascading process. Finally, an electron acoustic (EA) perturbation of scale k p = k min [m = 1] is applied on top of the QSIS inhomogeneity to determine its response in the presence of background ion scale inhomogeneity. Some key observations such as formation of transient PSV, wave-wave mode coupling interaction and various frequency generation alongwith comparative investigation with EA perturbation launched in the absence of ion scale inhomogeneity is also reported.
