论文标题
通过SOLPS-ITER建模进行MAST-U传统和Super-X配置之间的比较
Comparison between MAST-U conventional and Super-X configurations through SOLPS-ITER modelling
论文作者
论文摘要
MAST-U最近开始使用Super-X转移器运行，旨在通过简单的分析模型和SOLPS计算进行预测，以增加总通量扩张和中性捕获，以减少血浆和杂质密度脱离阈值。在这项研究中，利用SOLPS-ter代码，我们正在量化MAST-U SUPER-X和中性障碍物几何形状所允许的增益，这是在获得脱离方面所允许的。我们表明，在MAST-U中，对于Super-X，可以实现上游密度脱离阈值的显着降低（最高1.6），而不是常规的分离几何形状，主要是通过增加的总磁通膨胀，中性陷阱在不同配置之间非常相似。我们还表明，在这种紧密困惑的几何形状中，罢工点角的变化是复杂的，而目标正态分子更多地指向分隔质的情况并不一定意味着较低的脱离阈值。与先前的TCV计算一样，我们通过开发和应用对中性陷阱的定量定义来量化中性效应的作用。
MAST-U has recently started operating with a Super-X divertor, designed to increase total flux expansion and neutral trapping, both predicted through simple analytic models and SOLPS calculations to reduce the plasma and impurity density detachment thresholds. In this study, utilising the SOLPS-ITER code, we are quantifying the possible gain allowed by the MAST-U Super-X and neutral baffling geometry, in terms of access to detachment. We show that a significant reduction of the upstream density detachment threshold (up to a factor 1.6) could be achieved in MAST-U, for the Super-X, as opposed to conventional divertor geometry, mainly through an increased total flux expansion, neutral trapping being found very similar between the different configurations. We also show that variations of the strike-point angle are complex to interpret in such a tightly baffled geometry, and that a case in which the target normal points more towards the separatrix does not necessarily imply a lower detachment threshold. As in previous calculations for TCV, we quantify the role of neutral effects through developing and applying a quantitative definition of neutral trapping.
