论文标题
部分可观测时空混沌系统的无模型预测
Density filamentation nonlinearly driven by the Weibel instability in relativistic beam plasmas
论文作者
论文摘要
在许多梁血浆模拟和实验中都观察到了密度丝。由于电流丝是纯横向模式，因此电荷密度丝不能直接通过当前的细丝过程产生。为了解释这种现象，提出了几种机制，例如对芯片不稳定性与两流不稳定性的耦合，与Langmuir浪潮的耦合，梁和返回电流之间的热速度的差异，磁压力梯度之间的热速度差异。非均匀的洛伦兹因子分布会导致静电场和密度丝。介绍了仿真结果以及理论分析。
Density filamentation has been observed in many beam-plasma simulations and experiments. Because current filamentation is a pure transverse mode, charge density filamentation cannot be produced directly by the current filamentation process. To explain this phenomenon, several mechanisms are proposed such as the coupling of the Weibel instability to the two-stream instability, coupling to the Langmuir wave, differences in thermal velocities between the beam and return currents, the magnetic pressure gradient force, etc. In this paper, it is shown that the gradient of the Lorentz factor can, in fact, represent the nonlinear behavior of a plasma fluid and further that the nonuniform Lorentz factor distribution can give rise to electrostatic fields and density filaments. Simulation results together with theoretical analyses are presented.
