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首页> 外文期刊>Plasma physics and controlled fusion >Scrape-off layer (SOL) power width scaling and correlation between SOL and pedestal gradients across L, I and H-mode plasmas at ASDEX Upgrade
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Scrape-off layer (SOL) power width scaling and correlation between SOL and pedestal gradients across L, I and H-mode plasmas at ASDEX Upgrade

机译：ASDEX升级的L，I和H模式等离子体的刮削层（溶胶）电源宽度缩放和溶胶和基座梯度之间的相关性

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摘要

A cross-regime (L-mode, I-mode and H-mode) database combining scrape-off layer (SOL) power decay length lambda(q) divertor measurements and upstream SOL electron pressure, temperature and density decay lengths has been assembled at ASDEX Upgrade. It is found that a cross-regime lambda(q) scaling is best described by a local edge quantity, such as the edge electron pressure evaluated at rho(pol) = 0.95. Furthermore, lambda(q) exhibits a clear correlation with edge electron pressure gradient lengths, no matter if taken inside or outside the separatrix. In addition, the database reveals that SOL and pedestal electron pressure gradients are remarkably well correlated across all confinement regimes. The physical interpretation of this observation is discussed with regard to an edge pressure critical gradient paradigm governing the edge physics and to a turbulence spreading in the SOL. Moreover, it is shown that the Spitzer-Harm electron conduction regime is a reasonable approximation to estimate lambda(q) across different confinement regimes. The main implication of these findings is that a widening of lambda(q) is linked to a reduction of edge electron pressure gradients.
机译：组合刮削层（溶胶）功率衰减长度Lambda（Q）转向杆测量和上游溶胶电子压力，温度和密度衰减长度的交叉制度（L-MODE，I-MODE和H-MODE）数据库已组装Asdex升级。发现交叉制度λ（Q）缩放最好通过局部边缘量描述，例如在RHO（POL）= 0.95时评价的边缘电子压力。此外，Lambda（Q）表现出与边缘电子压力梯度长度的明显相关性，无论是在分离器内部还是外部。此外，数据库显示，溶胶和基座电子压力梯度在所有限制方案中具有非常好的相关性。关于该观察结果的物理解释是关于控制边缘物理学的边缘压力临界梯度范例和溶胶中的湍流扩散。此外，示出了斯波策般的电子传导方案是估计不同限制制度的Lambda（Q）的合理近似。这些发现的主要含义是λ（Q）的加宽与边缘电子压力梯度的减小相关联。

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