论文标题
连续旋转代码中性传输的动力学建模
Kinetic modeling of neutral transport for a continuum gyrokinetic code
论文作者
论文摘要
我们介绍了使用Gkeyll代码进行的6D连续模型的连续Full-F Fulokinetic湍流模型的首个耦合。我们的目标是提高对中性物质在血浆加油,分离中的作用以及它们与边缘等离子体概况和湍流统计量的相互作用的第一原理的理解。我们的模型仅包括原子氢,并结合了电子冲击电离,电荷交换和壁回收。这些特征已通过分析预测成功验证,并通过Degas2 Monte Carlo中性代码进行了测试。我们对具有简化几何形状和NSTX参数的刮擦层(SOL)进行仿真。我们将这些结果与无中性的基线模拟进行了比较,发现中性相互作用降低了归一化密度波动水平以及相关的偏度和峰度,同时增加了自动相关时间。还观察到了平坦的密度曲线,类似于实验场景中的SOL密度肩部的形成。
We present the first-of-its-kind coupling of a continuum full-f gyrokinetic turbulence model with a 6D continuum model for kinetic neutrals, carried out using the Gkeyll code. Our objective is to improve the first-principles understanding of the role of neutrals in plasma fueling, detachment, and their interaction with edge plasma profiles and turbulence statistics. Our model includes only atomic hydrogen and incorporates electron-impact ionization, charge exchange, and wall recycling. These features have been successfully verified with analytical predictions and benchmarked with the DEGAS2 Monte Carlo neutral code. We carry out simulations for a scrape-off layer (SOL) with simplified geometry and NSTX parameters. We compare these results to a baseline simulation without neutrals and find that neutral interactions reduce the normalized density fluctuation levels and associated skewness and kurtosis, while increasing auto-correlation times. A flatter density profile is also observed, similar to the SOL density shoulder formation in experimental scenarios with high fueling.