脉冲功率加热膨胀暖密箔的流体动力学模拟
Hydrodynamic simulations of expanded warm dense foil heated by pulsed-power
AI总结：
本研究提出了一种耦合电气描述与一维流体动力学代码的建模框架，用于设计和优化脉冲功率加热的暖密物质实验。
摘要：
暖密物质处于固态物质与等离子体的交界处，在从行星科学到惯性约束聚变的各个领域中都起着核心作用。提高对该状态的认识需要能够与理论和数值模型在广泛条件下直接比较的实验数据。在本工作中，描述了一种脉冲功率实验，其中薄金属箔被限制在蓝宝石细胞内，通过焦耳加热达到膨胀暖密物质状态。设计此类实验具有挑战性，因为它需要同时预测脉冲功率驱动器的电气响应和加热材料的流体动力学演化。为解决这一挑战，开发了一种建模框架，将脉冲功率系统的电气描述（包括驱动器、切换阶段和负载）与一维流体动力学代码耦合。这种耦合使电气能量沉积和负载热力学演化能够通过材料的电导率一致地联系起来。这种方法利用了一维几何的简单性，同时保留了本质的物理特性，能够以较高的准确性重现各种测量，如膨胀速度、电流和电压。因此，这种数值方法构成了一个稳健且高效的用于设计和优化未来使用脉冲功率设施的暖密物质实验的方法。
英文摘要：
Warm Dense Matter lies at the frontier between condensed matter and plasma, and plays a central role in various fields ranging from planetary science to inertial confinement fusion. Improving our understanding of this regime requires experimental data that can be directly compared with theoretical and numerical models over a broad range of conditions. In this work, a pulsed-power experiment is described in which thin metallic foils, confined within a sapphire cell, are Joule-heated to achieve the expanded warm dense matter regime. Designing such an experiment is challenging, as it requires simultaneously predicting the electrical response of the pulsed-power driver and the hydrodynamic evolution of the heated material. To tackle this challenge, a modeling framework has been developed that couples an electrical description of the pulsed-power system, including the driver, the switching stages and the load with a one-dimensional hydrodynamic code. This coupling allows the electrical energy deposition and the load thermodynamic evolution to be consistently linked through the material electrical conductivity. This approach takes advantage of the simplicity of a 1D geometry while retaining the essential physics and allowing to reproduce various measurements with good accuracy, such as expansion velocity, current and voltage. This numerical approach therefore constitutes a robust and efficient method for designing and optimizing future Warm Dense Matter experiments using pulsed-power facilities.
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