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

合作研究：流体动力学转变体系中 Langmuir 波崩溃和受激拉曼散射的 Vlasov 多维模拟

• 批准号: 1004118
• 负责人: Pavel Lushnikov
• 金额: $ 27万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-15 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1004118&HistoricalAwards=false
• 关键词: Collaborative; Research; Vlasov; Multi; Dimensional

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.

该奖项促进了 Vlasov 多维 (VMD) 模型的开发和应用，以研究非平衡等离子体动力学的基本现象。 VMD 模型利用实验室和太空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。人们曾认为明确结合流体动力学的模型必须忽略高温等离子体动力学的基本方面。通过证明情况并非一定如此，VMD 模型增进了我们的理解，展示了标准等离子体模型中什么是必需的以及什么不是必需的。VMD 产生的模拟方法比传统 PIC（“细胞中的粒子”）方法要高效得多。早期的研究目标是通过与之前通过 PIC 模拟获得的结果进行比较来验证 VMD 模型。 VMD模型的验证将允许其应用来预测等离子体波的非线性演化，等离子体波自然发生在高温等离子体中，如在脉冲星附近、地球电离层中以及更接近地球的地方，当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传播中时。 特别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 模拟确定状态变化边界处的激光强度可能会被非物理噪声所掩盖。 VMD 方法无噪声，扩大了可模拟的等离子体动力学范围。