双正交分解在TJ- II纬向流识别中的应用
The use of the Biorthogonal Decomposition for the identification of zonal flows at TJ-II
摘要：
这项工作解决了在聚变等离子体的带状流的识别。纬向流是大尺度现象，因此需要在远程位置进行多点测量以识别纬向流。给定这样的数据，双正交分解（或奇异值分解）能够提取多点波动的全局相关分量。通过使用一种新的正交技术的基础上的希尔伯特变换，传播的全球模式（如MHD模式），可以区分从非传播，同步（带状流）的全球组件。这些技术与进一步的信息，如频谱图和空间结构的组合，然后允许一个明确的识别的纬向流分量的波动。该技术进行了测试，使用陀螺动力学模拟。第一个明确的识别在TJ-II仿星器的纬向流的基础上，多点朗缪尔探针测量。
英文摘要：
This work addresses the identification of zonal flows in fusion plasmas. Zonal flows are large scale phenomena, hence multipoint measurements taken at remote locations are required for their identification. Given such data, the Biorthogonal Decomposition (or Singular Value Decomposition) is capable of extracting the globally correlated component of the multipoint fluctuations. By using a novel quadrature technique based on the Hilbert transform, propagating global modes (such as MHD modes) can be distinguished from the non-propagating, synchronous (zonal flow-like) global component. The combination of these techniques with further information such as the spectrogram and the spatial structure then allows an unambiguous identification of the zonal flow component of the fluctuations. The technique is tested using gyro-kinetic simulations. The first unambiguous identification of a zonal flow at the TJ-II stellarator is presented, based on multipoint Langmuir probe measurements.
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