Permutation entropy and statistical complexity in characterizing low-aspect-ratio reversed-field pinch plasma
Permutation entropy and statistical complexity in characterizing low-aspect-ratio reversed-field pinch plasma
复制标题
表征低纵横比反向场箍缩等离子体的排列熵和统计复杂性
DOI：
10.1088/1402-4896/aa6689
复制
发表时间：
2017
期刊：
影响因子：
2.9
通讯作者：
S. Masamune
中科院分区：
文献类型：
--
作者：
T. Onchi;A. Fujisawa;A. Sanpei;H. Himura;S. Masamune
排列熵和统计复杂度是对复杂时间序列的度量。Bandt-Pompe方法使用排列来评估概率分布。该方法对时间序列数据的信息量化具有鲁棒性和有效性。统计复杂度是Jensen-Shannon散度和排列熵的乘积。引入这些物理参数，分析了低纵横比反场掐缩（RFP）等离子体的发射和磁波动时间序列。观察到的时间序列数据聚集在平面的一个区域，即所谓的C-H平面，由熵与复杂性决定。C-H平面是用于区分时间序列数据的周期、混沌、随机和噪声过程的表示空间。在不同的rfp -等离子体条件下，发射特性和磁波动特性发生了变化。软x射线发射和磁波动的统计复杂性取决于反转和夹点参数之间的关系。
Permutation entropy and statistical complexity are measures for complex time series. The Bandt–Pompe methodology evaluates probability distribution using permutation. The method is robust and effective to quantify information of time series data. Statistical complexity is the product of Jensen–Shannon divergence and permutation entropy. These physical parameters are introduced to analyse time series of emission and magnetic fluctuations in low-aspect-ratio reversed-field pinch (RFP) plasma. The observed time-series data aggregates in a region of the plane, the so-called C–H plane, determined by entropy versus complexity. The C–H plane is a representation space used for distinguishing periodic, chaos, stochastic and noisy processes of time series data. The characteristics of the emissions and magnetic fluctuation change under different RFP-plasma conditions. The statistical complexities of soft x-ray emissions and magnetic fluctuations depend on the relationships between reversal and pinch parameters.