Application of transient transport analysis method for modulation experiment
Application of transient transport analysis method for modulation experiment
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DOI：
10.1063/5.0056982
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发表时间：
2021-08
期刊：
影响因子：
1.6
通讯作者：
Y. Ohtani;M. Yoshida;M. Honda;E. Narita
中科院分区：
文献类型：
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作者：
Y. Ohtani;M. Yoshida;M. Honda;E. Narita
提出了一种用于调制的瞬态传输分析方法（t-TRAM）。此方法由两种方法组成。一种是利用希尔伯特变换（HT）和分析模式分解（AMD）的瞬时调制分析方法。在调制实验中，等离子体输运可以通过调制的外部输入而周期性地改变。由于等离子体传输的变化，调制幅度和相位随时间变化的分布。在调制幅度和相位随时间变化的情况下，HT与AMD方法可以评估瞬时分析信号。另一种是传输分析方法，从分析信号中计算扩散系数和对流速度。的t-TRAM使我们能够评估的动量扩散系数和动量对流速度在动量源的存在下。将t-TRAM应用于JT-60 U的动量调制实验。评估表明，归一化的动量通量在调制的半个周期期间对归一化的动量梯度具有线性依赖性。
A transient TRansport Analysis method for Modulation (t-TRAM) has been developed. This method consists of two methods. One is an instantaneous modulation analysis method using the Hilbert transform (HT) with the analytical mode decomposition (AMD). In the modulation experiments, plasma transport can be changed periodically by modulated external input. Profiles of the modulation amplitude and phase change in time due to the change in the plasma transport. The HT with AMD method can evaluate an instantaneous analytic signal in the presence of changes in the modulation amplitude and phase in time. The other is a transport analysis method to evaluate the diffusion coefficient and the convection velocity from the analytic signal. The t-TRAM has enabled us to evaluate a momentum diffusion coefficient and momentum convection velocity in the presence of a momentum source. The t-TRAM is applied to momentum modulation experiments in JT-60U. The evaluation reveals that a normalized momentum flux has a linear dependence on a normalized momentum gradient during a half cycle of the modulation.