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首页> 外文期刊>Plasma physics and controlled fusion >Flux surface identification by spatio-temporal coupling with partial mutual information analysis of electron cyclotron emission data
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Flux surface identification by spatio-temporal coupling with partial mutual information analysis of electron cyclotron emission data

机译：通过时空耦合与电子回流系统的部分互信息分析的助焊表面识别

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摘要

Fluctuations of electron cyclotron emission (ECE) signals are analyzed for differently heated Wendelstein 7-X plasmas. The fluctuations appear to travel predominantly on flux surfaces and are used as 'tracers' in multivariate time series. Different statistical techniques are assessed to reveal the coupling and information entropy-based coupling analysis are conducted. All these techniques provide evidence that the fluctuation analysis allows one to check the consistency of magneto-hydrodynamic (MHD) equilibrium calculations. Expanding the suite of techniques applied in fusion data analysis, partial mutual information (PMI) analysis is introduced. PMI generalizes traditional partial correlation (Frenzel and Pompe Phys. Rev. Lett. 99 204101) and also Schreiber's transfer entropy (Schreiber 2000 Phys. Rev. Lett. 85 461). The main additional capability of PMI is to allow one to discount for specific spurious data. Since PMI analysis allows one to study the effect of common drivers, the influence of the electron cyclotron resonance heating on the mutual dependencies of simultaneous ECE measurements was assessed. Additionally, MHD mode activity was found to be coupled in a limited volume in the plasma core for different plasmas. The study reveals an experimental test for equilibrium calculations and ECE radiation transport.
机译：分析了不同加热温度的温德尔斯坦7-X等离子体中电子回旋发射（ECE）信号的波动。波动似乎主要在通量表面上传播，并在多变量时间序列中用作“示踪剂”。评估不同的统计技术以揭示耦合，并进行基于信息熵的耦合分析。所有这些技术都提供了证据，证明涨落分析可以检查磁流体力学（MHD）平衡计算的一致性。扩展了融合数据分析中应用的一系列技术，引入了部分互信息（PMI）分析。PMI概括了传统的偏相关（Frenzel and Pompe Phys.Rev.Lett.99 204101）和Schreiber的转移熵（Schreiber 2000 Phys.Rev.Lett.85 461）。PMI的主要附加功能是允许人们对特定的虚假数据进行折扣。由于PMI分析允许研究常见驱动因素的影响，因此评估了电子回旋共振加热对同步ECE测量的相互依赖性的影响。此外，对于不同的等离子体，发现MHD模式活动在等离子体核心的有限体积内耦合。这项研究揭示了平衡计算和ECE辐射传输的实验测试。

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