Observations of mode frequency increase and the appearance of ITB during the m/n=1/1 kink mode in EAST high electron temperature long pulse operation  

作　　者：晁燕 张威 胡立群 耿康宁 徐立清 张涛 臧庆 周天富 Yan CHAO;Wei ZHANG;Liqun HU;Kangning GENG;Liqing XU;Tao ZHANG;Qing ZANG;Tianfu ZHOU(Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,People's Republic of China;University of Science and Technology of China,Hefei 230026,People's Republic of China;Institute for Fusion Theory and Simulation,School of Physics,Zhejiang University,Hangzhou 310027,People's Republicof China)

机构地区：[1]Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,People's Republic of China [2]University of Science and Technology of China,Hefei 230026,People's Republic of China [3]Institute for Fusion Theory and Simulation,School of Physics,Zhejiang University,Hangzhou 310027,People's Republicof China

出　　处：《Plasma Science and Technology》2023年第2期68-76,共9页等离子体科学和技术（英文版）

基　　金：supported by the National Magnetic Confinement Fusion Science Program of China (No. 11505226);National Natural Science Foundation of China (Nos. 11975273 and 12005185);the Fundamental Research Fund for Chinese Central Universities (No. 2021FZZX003-03-02);the Science Foundation of Institute of Plasma Physics, Chinese Academy of Sciences (Nos. DSJJ-202103 and DSJJ-2021-08);the National Key R&D Program of China (No. 2019YFE03010002)

摘　　要：A new long-pulse high electron temperature(Te)regime has been achieved on experimental advanced superconducting tokamak by pure radio frequency heating.In this new scenario,there are mainly two confinement states involving two magneto-hydrodynamic(MHD)modes,one of which is identified as m/n=1/1 kink mode(where m and n are the poloidal and toroidal mode numbers,respectively).The frequency evolution of the kink mode is investigated through the three-dimensional,toroidal,and nonlinear Hall-MHD code CLT.We firstly find that the frequency of the m/n=1/1 kink mode significantly increases during each sawtooth crash and then confirmed it through the experimental data.The simulation results indicate that the increase of the mode frequency is mainly due to the significant increase of the electron diamagnetic frequency nearby the reconnection region.We have also observed the internal transport barrier(ITB)during the m/n=1/1 kink mode.To further investigate this m/n=1/1 kink mode in this new regime,the multi-scale interactions between the m/n=1/1 kink mode and turbulence are discussed.

关 键 词：SAWTOOTH electron diamagnetic drift ITB multi-scale interaction 

分 类 号：TL612[核科学技术—核技术及应用]