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Comparison of L- and H-mode plasma edge fluctuations in MAST

机译:MAST中L模式和H模式等离子体边缘波动的比较

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摘要

Edge turbulence measurements from a reciprocating Langmuir probe in MAST are presented. A comparison of the range/standard deviation (R/S), growth of range, first moment and differencing and rescaling methods for calculating the Hurst exponent is made. The differencing and rescaling method is found to be the most useful for identifying scaling over long time-periods. A comparison is made between L-mode, dithering H-mode and H-mode plasma edge turbulence and evidence for self-similarity is found. Tests are performed and it is demonstrated that the results are due to properties of the data, and are not artefacts of the methods. A comparison of Hurst exponent methods with the autocorrelation function and power spectrum is used to demonstrate the presence of long-time correlation in L-mode data, and the absence of long-time correlation in the case of dithering H-mode.
机译:提出了在MAST中使用往复式Langmuir探针进行边缘湍流测量的方法。比较了范围/标准偏差(R / S),范围的增长,一阶矩以及用于计算Hurst指数的微分和重新缩放方法。发现微分和重新缩放方法对于识别长时间段内的缩放最有用。在L模式,抖动H模式和H模式等离子体边缘湍流之间进行了比较,并发现了自相似的证据。进行了测试,结果表明结果归因于数据的属性,而不是方法的假象。将Hurst指数方法与自相关函数和功率谱进行比较,可以证明L模式数据中存在长期相关性,而在抖动H模式时则没有长期相关性。

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