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Blob-hole correlation model for edge turbulence and comparisons with NSTX gas puff imaging data

机译：NSTX气体浮气成像数据的边缘湍流与比较的膨胀孔相关模型

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摘要

Gas puff imaging (GPI) observations made in NSTX (Zweben et al 2017 Phys. Plasmas 24 102509) have revealed two-point spatial correlations of edge and scrape-off layer (SOL) turbulence in the plane perpendicular to the magnetic field. A common feature is the occurrence of dipole-like patterns with significant regions of negative correlation. In this paper, we explore the possibility that these dipole patterns may be due to blob-hole pairs. Statistical methods are applied to determine the two-point spatial correlation that results from a model of blob-hole pair formation. It is shown that the model produces dipole correlation patterns that are qualitatively similar to the GPI data in several respects. Effects of the reference location (confined surfaces or SOL), a superimposed random background, hole velocity and lifetime, and background sheared flows are explored and discussed with respect to experimental observations. Additional analysis of the experimental GPI dataset is performed to further test this blob-hole correlation model. A time delay two-point spatial correlation study did not reveal inward propagation of the negative correlation structures that were postulated to correspond to holes in the data nor did it suggest that the negative correlation structures are due to neutral shadowing. However, tracking of the highest and lowest values (extrema) of the normalized GPI fluctuations shows strong evidence for mean inward propagation of minima and outward propagation of maxima, in qualitative agreement with theoretical expectations. Other properties of the experimentally observed extrema are discussed.
机译：在NSTX（Zweben等，2017张）中制作的气体浮气成像（GPI）观察结果。等离子体24 102509）揭示了垂直于磁场的平面中的边缘和刮削层（溶胶）湍流的两点空间相关性。共同的特征是发生具有重要负相关区域的偶极状模式的发生。在本文中，我们探讨了这些偶极模式可能是由于Blob-Hole对的可能性。应用统计方法以确定由Blob-Hob对形成模型产生的两点空间相关性。结果表明，该模型产生与多个方面的与GPI数据类似地类似的偶极相关模式。参考位置（限制表面或溶胶），叠加随机背景，孔速度和寿命以及背景剪切流的影响，并讨论了实验观察。对实验GPI数据集进行额外的分析，以进一步测试该膨胀孔相关模型。时间延迟两点空间相关研究没有揭示假设的负相关结构的向内传播，以对应于数据中的孔，也不表明负相关结构是由于中性阴影。然而，跟踪归一化GPI波动的最高和最低值（极值）显示出最大的载体的强烈证据，以便在与理论期望的定性协议中的最小值和最大的传播。讨论了实验观察到的极值的其他性质。

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