J-TEXT装置上密度对边缘剪切流和湍流的影响  

Effect of Density on Edge Shear Flow and Turbulence on J-TEXT

作　　者：温思宇 赵开君 谢耀禹 陈志鹏 陈忠勇[2] 高丽[2] 丁肖冠 胡莹欣 WEN Siyu;ZHAO Kaijun;XIE Yaoyu;CHEN Zhipeng;CHEN Zhongyong;GAO Li;DING Xiaoguan;HU Yingxin(School of Nuclear Science and Engineer,East China University of Technology,Nanchang 330013,China;State Key Laboratory of Advanced Electromagnetic Technology,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,强电磁技术全国重点实验室,武汉430074

出　　处：《能源研究与管理》2025年第1期151-158,172,共9页Energy Research and Management

基　　金：国家自然科学基金项目(12075057)。

摘　　要：湍流非线性驱动的剪切流可以通过剪切抑制湍流及其驱动的输运。为研究密度对J-TEXT装置上边缘剪切流和湍流的影响,采用快速往复朗缪尔探针阵列观测了边缘等离子体参数,利用两点法和联合概率密度函数等方法,详细分析了不同弦积分密度下剪切层附近的湍流特征。结果表明:随着等离子体密度的增加,边缘电子温度降低,在Δr=-0.25 cm附近的E_(r)×B剪切减弱,湍流极向和径向波数谱的峰值增大,并且峰值径向波数由0.8 cm^(-1)变为1.6 cm^(-1);在剪切层附近,增加等离子体密度可以减弱残余协强和边缘剪切流,以及增强湍流传播;较低密度时,剪切流引起的湍流对称性破缺可以增强残余协强,进而驱动剪切流。研究结果对于理解托卡马克等离子体中的湍流输运和改进约束有所帮助。The shear flows due to turbulence nonlinear interaction can suppress turbulence and its driven transport.The effects of the density on the edge shear flows and turbulence are observed in the plasmas of the J-TEXT tokamak using a fast-recipro-cating Langmuir probe array.Using two-point cross-correlation technique and joint probability density function,the turbulent characteristics near the shear layer were analyzed under different line integral densities.The results indicate that as the plasma density increases,edge electron temperature decreases,and E_(r)×B shear nearΔr=-0.25 weakens.The peak values of turbu-lent poloidal and radial wavenumber spectrum increase,and the peak radial wavenumber changes from 0.8 cm^(-1) to 1.6 cm^(-1).Increasing plasma density can weaken residual stress and edge shear flows and enhance turbulence spreading.Further analysis indicates that at lower density,the turbulence symmetry breaking caused by the shear flows can enhance the residual stress,thereby driving shear flow.The research results are helpful for understanding turbulent transport and improvement confine-ment in the tokamak plasmas.

关 键 词：剪切流 朗缪尔探针 残余协强 湍流传播 

分 类 号：TL631.24[核科学技术—核技术及应用]