J-TEXT托卡马克等离子体中非局域效应期间温度涨落的统计分析  

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

作　　者：向林 赵开君 谢耀禹 杨州军[2] 陈志鹏 陈忠勇[2] 高丽[2] 丁永华[2] 张锦钰 杨宇 王能超[2] 梁云峰 XIANG Lin;ZHAO Kaijun;XIE Yaoyu;YANG Zhoujun;CHEN Zhipeng;CHEN Zhongyong;GAO li;DING Yonghua;ZHANG Jinyu;YANG Yu;WANG Nengchao;LIANG Yunfeng(School of Nuclear Science and Engineer,East China University of Technology,Nanchang 330013,China;International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]东华理工大学核科学与工程学院,南昌330013 [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,武汉430074

出　　处：《能源研究与管理》2022年第4期129-136,共8页Energy Research and Management

基　　金：国家自然科学基金项目(12075057,11875020);创新群体项目(51821005);江西省自然科学基金项目(20202ACBL201002)。

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。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.

关 键 词：托卡马克 磁约束等离子体 非局域热输运现象 电子温度涨落 

分 类 号：TL631.24[核科学技术—核技术及应用]