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Multi-code analysis of scrape-off layer filament dynamics in MAST

机译：MAST中刮擦层长丝动力学的多代码分析

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摘要

Four numerical codes are employed to investigate the dynamics of scrape-off layer filaments in tokamak relevant conditions. Experimental measurements were taken in the MAST device using visual camera imaging, which allows the evaluation of the perpendicular size and velocity of the filaments, as well as the combination of density and temperature associated with the perturbation. A new algorithm based on the light emission integrated along the field lines associated with the position of the filament is developed to ensure that it is properly detected and tracked. The filaments are found to have velocities of the order of 1 km s(-1), a perpendicular diameter of around 2-3 cm and a density amplitude 2-3.5 times the background plasma. 3D and 2D numerical codes (the STORM module of BOUT++, GBS, HESEL and TOKAM3X) are used to reproduce the motion of the observed filaments with the purpose of validating the codes and of better understanding the experimental data. Good agreement is found between the 3D codes. The seeded filament simulations are also able to reproduce the dynamics observed in experiments with accuracy up to the experimental errorbar levels. In addition, the numerical results showed that filaments characterised by similar size and light emission intensity can have quite different dynamics if the pressure perturbation is distributed differently between density and temperature components. As an additional benefit, several observations on the dynamics of the filaments in the presence of evolving temperature fields were made and led to a better understanding of the behaviour of these coherent structures.
机译：四个数字代码用于研究托卡马克相关条件下刮擦层长丝的动力学。在MAST设备中使用可视摄像机成像进行了实验测量，这可以评估细丝的垂直尺寸和速度，以及与扰动相关的密度和温度的组合。开发了一种新的算法，该算法基于沿着与灯丝位置相关的磁力线积分的光发射，以确保正确检测和跟踪它。发现这些细丝的速度约为1 km s（-1），垂直直径约为2-3 cm，密度幅度是背景等离子体的2-3.5倍。 3D和2D数字代码（BOUT ++，GBS，HESEL和TOKAM3X的STORM模块）用于再现观察到的细丝的运动，以验证代码并更好地理解实验数据。在3D代码之间发现了良好的一致性。种子细丝模拟还能够再现实验中观察到的动力学，精度高达实验误差水平。另外，数值结果表明，如果压力扰动在密度和温度分量之间的分布不同，则具有相似尺寸和发光强度的细丝可以具有完全不同的动力学。另一个好处是，在温度场不断变化的情况下对灯丝的动力学进行了几项观察，从而使人们对这些相干结构的行为有了更好的了解。

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