论文标题
多维电流驱动的等离子体不稳定性和空心阴极羽流中的湍流的光谱分析
Spectral analysis of multidimensional current-driven plasma instabilities and turbulence in hollow cathode plumes
论文作者
论文摘要
空心阴极羽流中的大振幅电流驱动的不稳定性可以产生负责阴极溅射和航天器降解的能量离子。一个2D2V（配置[D]和速度[V]空间）的2D2V（两个维度）基于网格的vlasov- poisson（直接动力学）求解器用于研究它们的生长和饱和度，其中包括四个阶段：线性生长，清晰度共鸣，非线性填充和饱和饱和饱和型涡轮均匀。分析了线性模态生长速率，非线性饱和过程以及湍流状态下的离子速度和能量分布特征。向后流动是针对大电子漂移产生的，电源场变得湍流后几个离子声周期。分析了弗拉索夫方程的尺度间空间传输和局部性。多维研究阐明了纵向和横等等离子体不稳定性以及血浆湍流的建立之间的相互作用。
Large-amplitude current-driven instabilities in hollow cathode plumes can generate energetic ions responsible for cathode sputtering and spacecraft degradation. A 2D2V (two dimensions each in configuration [D] and velocity [V] spaces) grid-based Vlasov--Poisson (direct kinetic) solver is used to study their growth and saturation, which comprises four stages: linear growth, quasilinear resonance, nonlinear fill-in, and saturated turbulence. The linear modal growth rate, nonlinear saturation process, and ion velocity and energy distribution features in the turbulent regime are analyzed. Backstreaming ions are generated for large electron drifts, several ion acoustic periods after the potential field becomes turbulent. Interscale phase-space transfer and locality are analyzed for the Vlasov equation. The multidimensional study sheds light on the interactions between longitudinal and transverse plasma instabilities, as well as the inception of plasma turbulence.
