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Intermittent fluctuations in the Alcator C-Mod scrape-off layer

机译：Alcator C-Mod刮除层中的间歇性波动

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摘要

Fluctuations in the boundary region of the Alcator C-Mod tokamak have been analyzed using gas puff imaging data. It is found that the fluctuation amplitudes in the near scrape-off layer follow a normal distribution while the far scrape-off layer fluctuations are dominated by large amplitude bursts due to radial motion of blob-like structures and have a positively skewed and flattened amplitude probability distribution. Conditional averaging of the time series reveals burst wave forms with a fast rise and slow decay and exponentially distributed burst amplitudes and waiting times. Based on this, a stochastic model of the burst dynamics is constructed. The model predicts that fluctuation amplitudes should follow a Gamma distribution and that there is a parabolic relation between the skewness and the kurtosis moments of the fluctuations. This is shown to compare favorably with the gas puff imaging data over a range of line-averaged plasma densities.
机译：Alcator C-Mod托卡马克的边界区域的波动已使用吹气成像数据进行了分析。发现近刮层的波动幅度服从正态分布，而远刮层的波动主要受斑点状结构的径向运动引起的大幅度脉冲爆发的影响，并且具有正偏和平坦的振幅概率。分配。时间序列的条件平均显示突发波形，具有快速上升和缓慢衰减，以及突发幅度和等待时间呈指数分布。基于此，建立了突发动力学的随机模型。该模型预测波动幅度应遵循Gamma分布，并且波动的偏度和峰度矩之间存在抛物线关系。这表明与线平均血浆密度范围内的气体抽吸成像数据相比具有优势。

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