论文标题
血浆中两流不稳定性的动态缓解
Dynamic mitigation of two-stream instability in plasma
论文作者
论文摘要
根据血浆和流体不稳定性的相控制，讨论了两流不稳定性的动态缓解机制。论文[物理学。等离子体19，024503（2012）]。缓解方法应用于本文的两流不稳定性。通常，不稳定性从扰动中出现，通常扰动阶段是未知的。因此，在流体和等离子体中讨论了不稳定性的增长率。但是，如果已知扰动阶段，则可以通过主动施加的扰动叠加来控制不稳定性生长。例如，受扰动的驱动器会引起对流体或等离子体的扰动。如果驱动器振荡会主动振荡驱动器诱导的扰动，则已知扰动阶段，并且可以控制扰动振幅，例如进料福尔德控制。本文显示的应用结果表明，动态缓解机制可以很好地平滑不均匀性并减轻等离子体中的不稳定性。
A dynamic mitigation mechanism of the two-stream instability is discussed based on a phase control for plasma and fluid instabilities. The basic idea for the dynamic mitigation mechanism by the phase control was proposed in the paper [Phys. Plasmas 19, 024503(2012)]. The mitigation method is applied to the two-stream instability in this paper. In general, instabilities appear from the perturbations, and normally the perturbation phase is unknown. Therefore, the instability growth rate is discussed in fluids and plasmas. However, if the perturbation phase is known, the instability growth can be controlled by a superimposition of perturbations imposed actively. For instance, a perturbed driver induces a perturbation to fluids or plasmas; if the perturbation induced by the perturbed driver is oscillated actively by the driver oscillation, the perturbation phase is known and the perturbation amplitude can be controlled, like a feedforward control. The application result shown in this paper demonstrates that the dynamic mitigation mechanism works well to smooth the non-uniformities and mitigate the instabilities in plasmas.
