【作者】 程均； 严龙文； 洪文玉； 赵开君； 兰涛； 钱俊； 刘阿棣； 赵海林； 杨青魏； 刘仪； 段旭如； 刘永； 潘传红；

【Author】 Cheng Jun~1,Yan Long-wen~1,Hong Wen-yu~1,Zhao Kai-jun~1,Lan Tao~2,Qian Jun~1, Liu A-di~2,Zhao Hai-lin~2,Yang Qing-wei~1,Liu Yi~1,Duan Xu-ru~1,Liu Yong~1,Pan Chuan-hong~1 (1.Southwestern Institute of Physics,Chengdu of Sichuan Prov.610041,China; 2.Department of Modern Physics,University of Science and Technology of China,Hefei of Anhui Prov.230026,China)

【机构】 核工业西南物理研究院； 中国科学技术大学近代物理系；

【摘要】 在HL-2A托克马克刮削层（SOL）中,利用快速扫描探针对的等离子体湍流结构blob的统计特征做了详细研究。偏度和峰度随半径向外增加,同时两者近似满足抛物分布。条件平均技术同时能估计blob的极向和径向运动速度,径向运动速度大约在0.5～1.5 km/s,而极向速度大约在1.0～3.0 km/s,主要受E×B驱动的结果。极向波数展宽随半径增加而变宽,符合blob传播过程特征。波数谱的衰减系数,证实了在SOL存在正级联能量转移过程。小波-双谱方法表明,湍流非线性相互作用在LCFS附近很强,而远离LCFS耦合变弱。在最后闭合磁面位置（LCFS）处估计了blob的产生频率大约为8.0×10³s^-1,一个大幅度的blob出现导致粒子通量的急剧增加。Blob的产生概率为18%,而它携带的粒子通量却能占整个粒子通量的58%。更多还原

【Abstract】 Statistical characteristics of blobs in the scrape-off layer（SOL） of HL-2A tokamak have been systemically studied with reciprocating Langmuir probe array.The kurtosis and skewness obey a parabolic profile.The radial profiles of poloidal and radial velocities of the blobs are simultaneously measured with a novel five-probe array.Blobs propagate with radial velocity about 0.5¹.5 km/s and poloidal velocity about 1.0～3.0 km/s.The agreement of propagation velocity with electric drifts E×B confirms the theoretical prediction.From the near SOL to the far SOL,the width of poloidal wave number becomes larger.The decay index of wave number spectrum is consistent with direct cascade.The dependence of significant nonlinear interaction on the position close to the LCFS has been observed.Moreover,the blob generation rate is estimated as 8.0×l0³ s^-1 and the convective particle flux induced by the ejective blobs can account for about 58%loss of radial particle flux.更多还原