Statistical Analysis of Temperature Fluctuations during Non-local transport in the J-TEXT Tokamak Plasmas

向林; 赵开君; 谢耀禹; 杨州军; 陈志鹏; 陈忠勇; 高丽; 丁永华; 张锦钰; 杨宇; 王能超; 梁云峰

doi:10.16056/j.2096-7705.2022.04.021

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Statistical Analysis of Temperature Fluctuations during Non-local transport in the J-TEXT Tokamak Plasmas

更新时间：2026-01-19

- Statistical Analysis of Temperature Fluctuations during Non-local transport in the J-TEXT Tokamak Plasmas
- Issue 4, Pages: 129-136(2022)
- 作者机构：
  
  1. 东华理工大学核科学与工程学院
  2. 华中科技大学电气与电子工程学院磁约束聚变与等离子体国际合作联合实验室
- 作者简介：
- 基金信息：
- DOI：10.16056/j.2096-7705.2022.04.021
  CLC： TL631.24
- Published：2022
- 稿件说明：
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向林, 赵开君, 谢耀禹, et al. Statistical Analysis of Temperature Fluctuations during Non-local transport in the J-TEXT Tokamak Plasmas[J]. 2022, (4): 129-136.
DOI：

向林, 赵开君, 谢耀禹, et al. Statistical Analysis of Temperature Fluctuations during Non-local transport in the J-TEXT Tokamak Plasmas[J]. 2022, (4): 129-136. DOI： 10.16056/j.2096-7705.2022.04.021.

摘要

非局域热输运现象(NLT)是聚变界未解之谜。迄今为止，并没有恰当的理论模型解释NLT现象，但人们普遍认为NLT现象与湍流有关。采用延迟相关性分析方法及湍流强度长程相关性分析方法，分析了NLT期间由ECE测量的电子温度涨落的特征。结果发现在欧姆放电和ECRH加热等离子体中出现的NLT期间，电子温度涨落强度均具有长程相关性，且电子温度涨落的相对强度在r/a<0.8的区域均降低。重点分析了电子温度涨落的峰度和偏度在欧姆和ECRH等离子体中SMBI前后的变化。发现在欧姆等离子体中SMBI注入后芯部电子温度涨落更远离高斯分布，而在ECRH等离子体中其更接近高斯分布。在欧姆放电和ECRH加热等离子体中，SMBI注入前后，峰度和偏度的显著不同表明NLT的出现与温度涨落的峰度和偏度无关。

Abstract

Non-local heat transport（NLT） is a mystery in the fusion field. So far

there is no appropriate theoretical model that can fully explain the NLT phenomenon

but most people think that the NLT is related to turbulence. The characteristics of the electron temperature fluctuations measured by ECE during NLT are analyzed using the delayed correlation analysis and the long-range correlation analysis methods. The intensities of temperature fluctuations have a long-range correlation during NLT in both Ohmic and ECRH plasmas

and the relative intensities of electron temperature fluctuations decrease in the region of r/a<0.8. The kurtosis and skewness of the electron temperature fluctuations are analyzed before and after SMBI in the ohmic and ECRH plasmas. It is found that after SMBI

the electron temperature fluctuations in the core in the Ohmic plasmas are farther away from the Gaussian distribution

while they are closer to the Gaussian distribution in the ECRH plasmas. In ohmic discharge and ECRH-heated plasmas

significant differences in kurtosis and skewness before and after SMBI indicate that the appearance of NLT is independent of turbulent kurtosis and skewness.

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