摘要
Accurate measurement of the average plasma parameters in the edge region,including the temperature and density of electrons and ions,is critical for understanding the characteristics of the scrape-off layer(SOL) and divertor plasma transport in magnetically confined fusion research.On the J-TEXT tokamak,a multi-channel retarding field analyzer(RFA) probe has been developed to study average plasma parameters in the edge region under various poloidal divertor and island divertor configurations.The edge radial profile of the ion-to-electron temperature ratio,τ_(i/e),has been determined,which gradually decreases as the SOL ion self-collisionality,v_(SOL)*,increases.This is broadly consistent with what has been observed previously from various tokamak experiments.However,the comparison of experimental results under different configurations shows that in the poloidal divertor configuration,even under the same v_(SOL)*,τ_(i/e) in the SOL region becomes smaller as the distance from the X-point to the target plate increases.In the island divertor configuration,τ_(i/e) near the O-point is higher than that near the X-point at the same v_(SOL)*,and both are higher than those in the limiter configuration.These results suggest that the magnetic configuration plays a critical role in the energy distributions between electrons and ions at the plasma boundary.
作者
李存凯
梁云峰
江中和
周松
华建坤
阳杰
杨庆虎
Alexander KNIEPS
Philipp DREWS
徐鑫
毛飞越
谢伟
杨雨桐
郭金龙
李杨波
任正康
陈志鹏
王能超
the J-TEXT Team
Cunkai LI;Yunfeng LIANG;Zhonghe JIANG;Song ZHOU;Jiankun HUA;Jie YANG;Qinghu YANG;Alexander KNIEPS;Philipp DREWS;Xin XU;Feiyue MAO;Wei XIE;Yutong YANG;Jinlong GUO;Yangbo LI;Zhengkang REN;Zhipeng CHEN;Nengchao WANG;the J-TEXT Team(International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics,State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,People's Republic of China;Forschungszentrum Julich GmbH,Institut fur Energie-und Klimaforschung—Plasmaphysik,Partner of the Trilateral Euregio Cluster(TEC),Julich 52425,Germany;不详)
基金
supported by the National Magnetic Confinement Fusion Energy R&D Program of China (No.2018YFE0309100)
National Natural Science Foundation of China (No.51821005)。