Bi-Coherence Analysis of Fluctuations with Long Distance Correlation in Toroidal Plasmas
Bi-Coherence Analysis of Fluctuations with Long Distance Correlation in Toroidal Plasmas
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DOI：
10.1143/jpsj.81.034501
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发表时间：
2012-02
影响因子：
1.7
通讯作者：
S. Inagaki;Tatsuya Kobayashi;K. Itoh;T. Tokuzawa;S. Itoh;K. Ida;N. Tamura;N. Kasuya;A. Fujisawa;S. Kubo;T. Shimozuma;M. Yagi;Kenji Tanaka;Y. Nagayama;K. Kawahata;H. Yamada
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文献类型：
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作者：
S. Inagaki;Tatsuya Kobayashi;K. Itoh;T. Tokuzawa;S. Itoh;K. Ida;N. Tamura;N. Kasuya;A. Fujisawa;S. Kubo;T. Shimozuma;M. Yagi;Kenji Tanaka;Y. Nagayama;K. Kawahata;H. Yamada
在大型螺旋装置（LHD）上发现了具有长径向相关长度（等离子体半径数量级）的宏观温度波动。本文利用交叉双相干分析研究了长程波动和微观波动之间的非线性耦合。在频率 f < 100 kHz 范围内观察到长程波动和微观波动之间的显着交叉双相干性，其中 f 是微观波动的频率。研究发现，这种三波耦合的平方双相干性和双相位对微观涨落的频率的依赖性很弱。这些观察结果表明，微观波动与长程波动相互作用。
Macro-scale temperature fluctuations, which have long radial correlation length (of the order of the plasma radius), have been discovered on Large Helical Device (LHD). In this paper, non-linear coupling between the long-range fluctuations and microscopic fluctuations is investigated using cross bi-coherence analysis. The significant cross bi-coherence between long-range fluctuations and micro-fluctuations is observed in the range of frequency f < 100 kHz, where f is the frequency of microscopic fluctuations. It is found that the squared bi-coherence and bi-phase for this three-wave coupling is weakly dependent on the frequency of microscopic fluctuations. These observations demonstrate that the microscopic fluctuations are coherently interacting with long-range fluctuations.