Conditional analysis of floating potential fluctuations at the edge of the Texas Experimental Tokamak Upgrade (TEXT‐U)
Conditional analysis of floating potential fluctuations at the edge of the Texas Experimental Tokamak Upgrade (TEXT‐U)
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DOI：
10.1063/1.871435
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发表时间：
1995-03
影响因子：
2.2
通讯作者：
A. Filippas;R. Bengston;G. X. Li;M. A. Meier;C. Ritz;E. Powers
中科院分区：
文献类型：
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作者：
A. Filippas;R. Bengston;G. X. Li;M. A. Meier;C. Ritz;E. Powers
利用条件统计分析技术对刮脱层和等离子体边缘的浮动电位波动进行了分析。浮动电位波动具有近似高斯的概率密度函数，在剪切层与高斯的偏差最大。条件平均技术遵循浮动电位信号中选定条件的统计演变。条件特征在时间或空间上的衰减率随所选条件的幅值呈现小的系统变化。要么长寿命的相干结构在统计上没有显著的数量，要么波动由大量具有波动幅度接近高斯分布的相干结构主导，要么使用浮动势的振幅作为条件的条件分析不是识别相干结构的敏感技术。
Fluctuations in floating potential in the scrape‐off layer and plasma edge were analyzed using a conditional statistical analysis technique. The floating potential fluctuations had a nearly Gaussian probability density function with the largest deviation from a Gaussian at the shear layer. The conditional averaging technique followed the statistical evolution of selected conditions in the floating potential signal. The decay rate of a conditional feature in time or space showed a small systematic variation with the amplitude of condition chosen. Either long‐lived coherent structures are not present in statistically significant numbers, or the fluctuations are dominated by a large number of coherent structures with a nearly Gaussian distribution of fluctuation amplitudes, or conditional analysis using the amplitude of the floating potential as a condition is not a sensitive technique for identifying coherent structures.