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Analysis of Alfven eigenmodes in stellarators using non-evenly spaced probes

机译：使用非均匀间隔探针分析恒星中的Alfven本征模式

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Eigenmodes play an important role in the dynamics of spatially extended systems. Using arrays of probes, it is possible to measure the spatial structure of experimentally observed fluctuations. But the interpretation of the measured data becomes very difficult if the number of probes is low, the probes are not evenly spaced or different sample rates are used. This is a common situation in magnetically confined fusion plasmas. A method is proposed that allows the time- resolved reconstruction of the mode numbers and frequencies of eigenmodes in such a situation. It is based on the well known Lomb periodogram and has the following properties: statistical interpretation of the results, combined analysis of spatial and temporal data and effective noise reduction. Though this method can be generalized to arbitrary geometries, this work is dedicated to the analysis of Alfven eigenmodes in stellarators. The method is applied to Mirnov probes which are found in many stellarators to diagnose Alfven eigenmodes. Tests have been performed for the probe setup installed at the Wendelstein 7-AS stellerator, IPP Garching, Germany, for which experimental results are presented.
机译：本征模在空间扩展系统的动力学中起重要作用。使用探针阵列，可以测量实验观察到的波动的空间结构。但是，如果探针数量少，探针间距不均匀或使用不同的采样率，则很难解释测量数据。在磁约束聚变等离子体中，这是常见的情况。提出了一种允许在这种情况下时间分辨本征模的模数和频率的方法。它基于众所周知的Lomb周期图，并具有以下属性：结果的统计解释，空间和时间数据的组合分析以及有效的降噪。尽管该方法可以推广到任意几何形状，但这项工作致力于分析恒星中的Alfven本征模。该方法适用于在许多星体中发现的Mirnov探针，以诊断Alfven本征模式。已对安装在德国IPP Garching的Wendelstein 7-AS旋转器上的探头设置进行了测试，并提供了实验结果。

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