Impact of resonant magnetic perturbation on blob motion and structure using a gas puff imaging diagnostic on the HL-2A tokamak  

作　　者：袁金榜 许敏 余羿 袁博达 聂林 季小全 孙腾飞 王傲 李继全 Jinbang YUAN;MinXU;YiYU;Boda YUAN;Lin NIE;Xiaoquan JI;Tengfei SUN;Ao WANG;Jiquan LI(Southwestern Institute of Physics,Chengdu 610041,People’s Republic of China;Sino-French Institute of Nuclear Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,People’s Republic of China)

机构地区：[1]Southwestern Institute of Physics,Chengdu 610041,People’s Republic of China [2]Sino-French Institute of Nuclear Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,People’s Republic of China

出　　处：《Plasma Science and Technology》2023年第9期34-41,共8页等离子体科学和技术（英文版）

基　　金：supported by the National Key Research and Development Program of China(Nos.2022YFE03100002,2022YFE03010004 and 2019YFE03060002);National Natural Science Foundation of China(Nos.U1867222,U1967206 and 51821005);the Sichuan Natural Science Foundation(Nos.2022NSFSC1791 and 2020JDTD0030).

摘　　要：The impact of resonant magnetic perturbation(RMP)on blob motion and structure in the SOL of the HL-2A tokamak is studied using a gas puff imaging diagnostic.Ellipse fitting is applied to study the structure and motion of blobs quantitatively.The radial locations,amplitudes and scale sizes of blobs are obtained based on the fitted ellipse.Furthermore,based on the measurement of blob location,the radial and poloidal velocities of blobs are calculated.With the application of RMP,the edge poloidal shear flow is significantly weakened and the wave number spectrum changes from quasisymmetric to significantly up-down asymmetric.The application of RMP also causes the detected blob location to be much further into the far scrape-off layer(SOL)and increases the blob amplitude.Blob poloidal velocity in the SOL is slowed.Larger-size and longer-lifetime blobs are observed with RMP.With the application of RMP,stronger-amplitude and larger-size blobs are detected in the far SOL and they may cause a more serious erosion problem to the first wall.

关 键 词：resonance magnetic perturbations blob structure blob motion gas puff imaging 

分 类 号：TL631.24[核科学技术—核技术及应用]