Collaborative Research: Vlasov Multi-Dimensional Simulation of Langmuir Wave Collapse and Stimulated Raman Scatter in the Fluid-Kinetic Transition Regime

该奖项使Vlasov多维(VMD)模型得以开发和应用于非平衡等离子体动力学中的基本现象。VMD模型利用了实验室和空间环境中遇到的定向等离子体波湍流特性，通过严格连接等离子体动力学的粒子和流体方面，这是以前无法实现的。人们一直认为，明确包含流体动力学的模型必须省略高温等离子体动力学的基本方面。通过证明事实并非如此，VMD模型促进了我们的理解，显示了标准等离子体模型中哪些是必要的，哪些是不必要的。VMD产生的模拟方法比传统的PIC(粒子在细胞中)方法要有效得多。早期的研究目标是通过与先前通过PIC模拟获得的结果进行比较来验证VMD模型。VMD模型的验证将使其能够应用于预测高温等离子体中自然发生的等离子体波的非线性演化，这些等离子体波在脉冲星附近、地球电离层以及更靠近地球的地方出现，因为它们发生在实验室产生的等离子体中的强微波和激光脉冲的传播中。尤其重要的是，对政权更迭进行更准确的建模。例如，在等离子体波湍流阻止激光传播之前，可以传输多少功率？通过PIC模拟确定区域变化边界的激光强度可能会受到非物理噪声的影响。VMD方法是无噪声的，扩大了通过模拟可以访问的等离子体动力学的范围。

This award enables development and application of the Vlasov Multi-Dimensional (VMD) model to fundamental phenomena in non-equilibrium plasma dynamics. The VMD model takes advantage of directed plasma wave turbulence properties, encountered in laboratory and space environments, by rigorously joining particle and fluid aspects of plasma dynamics, something which has previously been unattainable. It had been thought that models which explicitly incorporate fluid dynamics must omit essential aspects of high temperature plasma dynamics. By showing that this is not necessarily the case, the VMD model advances our understanding, showing what is and what is not essential in standard plasma models.VMD results in vastly more efficient simulation methods than afforded by traditional PIC ("particle in cell") methods. An early research goal is validation of the VMD model by comparison with results previously obtained by PIC simulations. Validation of the VMD model will allow its application to predicting the nonlinear evolution of plasma waves that naturally occur in high temperature plasma as found in the neighborhood of pulsars, in the earth's ionosphere, and, closer to earth, as they occur in the propagation of intense microwave and laser pulses in laboratory generated plasma. Of particular importance is the more accurate modeling of regime change. For example, how much power can be transmitted before plasma wave turbulence blocks laser propagation? Determination of laser intensity at regime change boundaries by PIC simulation may be obscured by unphysical noise. The VMD method is noise free, expanding the scope of plasma dynamics accessible by simulation.