The impact of toroidal mode coupling on high-density discharges in J-TEXT  

作　　者：Peng DENG Wenzhe MAO Zhipeng CHEN Yinan ZHOU Peng SHI Zhoujun YANG Li GAO Tao LAN Jinlin XIE Hong LI Zian WEI Adi LIU Chu ZHOU Weixing DING Wandong LIU Ge ZHUANG 邓鹏;毛文哲;陈志鹏;周乙楠;石鹏;杨州军;高丽;兰涛;谢锦林;李弘;卫子安;刘阿娣;周楚;丁卫星;刘万东;庄革(School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,People’s Republic of 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,People’s Republic of China;Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,People’s Republic of China)

机构地区：[1]School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,People’s Republic of China [2]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,People’s Republic of China [3]Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,People’s Republic of China

出　　处：《Plasma Science and Technology》2024年第12期1-8,共8页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.12175227 and 51821005);the Fundamental Research Funds for the Central Universities(No.USTC 20210079);the Collaborative Innovation Program of Hefei Science Center,CAS(No.2022HSC-CIP022)。

摘　　要：Density limit has long been a widely studied issue influencing the operating range of tokamaks.The rapid growth of the m/n=2/1(where m and n are poloidal and toroidal mode numbers,respectively)tearing mode is generally regarded as a primary precursor to the density limit disruption.In this experiment,the coupling of the m/n=1/1 mode and the m/n=2/1 mode in highdensity plasma was observed.During a sawtooth cycle,the frequencies of the two modes gradually converge until they become equal.After that,toroidal coupling occurs between the 1/1 and 2/1 modes,resulting in a mutually fixed phase relationship.With the occurrence of toroidal coupling,the 2/1 mode is stabilized.Prior to the disruption,the cessation of the 1/1 and 2/1 mode coupling,along with the rapid growth in the amplitude of the 2/1 mode,can be observed.Additionally,under the same parameters,comparing discharges with or without the 1/1 mode,it is found that the presence of the 1/1 mode leads to higher plasma density and temperature parameters.

关 键 词：toroidal coupling tearing mode density limit SAWTOOTH 

分 类 号：TL631.24[核科学技术—核技术及应用]