Overview of the recent experimental research on the J-TEXT tokamak
Authors: Ding Yonghua , Wang Nengchao , Chen Zhongyong , Xia Donghui , Yang Zhoujun , Chen Zhipeng , Zheng Wei , Yan Wei , Li Da , Zhou Song , Xu Xin , Zhang Xiaoyi , Mao Feiyue , Fang Jiangang , Ren Zhengkang , Chen Xixuan , Zhang Junli , Zhang Xiaobo , He Ying , Zhang Qi , Li You , Bai Wei , Mou Lingke , Li Feng , Long Ting , Ke Rui , Gao Li , Shi Peng , Shen Chengshuo , Liu Jiaxing , Guo Weixin , Wang Lu , Li Hanhui , Jiang Zhonghe , Zhang Xiaoqing , Li Jianchao , Rao Bo , Cheng Zhifeng , Zhu Ping , Liu Minghai , Xu Tao , Ma Shaoxiang , Yang Yong , Li Chuan , Wang Zhijiang , Zhang Ming , Yu Kexun , Hu Xiwei , Liang Y. , Yu Q. , Gentle K. W. , Pan Yuan ,   the J-TEXT Team, Ding Yonghua , Pan Yuan , Gentle Kenneth William , Hu Xiwei , Yu Kexun , Yu Qingquan , Liang Yunfeng , Xia Donghui , Zhang Ming , Gao Li , Wang Lu , Chen Zhongyong , Wang Zhijiang , Jiang Zhonghe , Chen Zhipeng , Yang Zhoujun , Cheng Zhifeng , Zhang Xiaoqing , Liu Minghai , Xu Tao , Zhu Ping , Jiang Wei , Yi Lin , Zhang Ya , Rao Bo , Hu Qiming , Zheng Wei , Ma Shaoxiang , Yang Yong , Li Chuan , Wang Nengchao , Li Jianchao , Huang Mingxiang , Guo Weixin , Yan Wei , Li Da , Li Haolong , Huang Zhuo , Zhou Song , Huang Jie , Li Hanhui , Wang Weijun , He Mei , Zhao Qing , Xu Jiayu , Zhou Gangyi , Ba Weigang , Yang Cheng , Yao Junjie , Wang Chuliang , He Bo , Hu Yongzhen , Deng Mingyang , Fu Jingwei , Liang Meiling , Guan Yehong , Wu Hongyan , Zhuang Ge , Ding Weixing , Lan Tao , Zeng Shiyong , Hussain Malik Sadam , Shi Peng , Lin Zhifang , Liu Hai , Sun Youwen , Zeng Long , Liu Shaocheng , Liao Liang , Zhong Wulyu , Shi Zhongbing , Jiang Min , Dong Yunbo , Xu Min , Wang Aike , Zhang Xiaolong , Liu Linzi , Tong Ruihai , Cheng Jun , Nie Lin , Ke Rui , Long Ting , Li Hui , Xu Jianqiang , Yang Zengchen , Wen Jie , Liang Anshu , Zhang Yipo , Wu Yifan , Chen Chengyuan , Zhao Kaijun , Shi Yuejiang , Huang He , Austin Max , Lee Sanggon , Luhmann Neville C. , Domier Calvin W. , Zhu Yilun , Brower David L. , Chen Jie , Ida K. , Takemura Y. , Suzuki Y. , Nagasaki K. , Drews P. , Knieps A. , Han Xiang , Krämer-Flecken A. , Henkel M. , He Jiyang , Zhou Yinan , Jia Ruo , He Ying , Peng Yue , Zhang Qi , Wang Pengyu , Xu Xin , Li Jiawei , Li You , Mao Feiyue , Zhang Xiaoyi , Yang Jie , Lu Conghui , Zhang Junli , Lu Yiwei , Wang Rumeng , Zhang Hongqi , Zeng Yingqin , Shen Chengshuo , Fang Jiangang , Ren Zhengkang , Zhang Guodong , Chen Xixuan , Ma Fangyuan , Bala Abba Alhaji , Li Dingchen , Hua Jiankun , Ai Xinkun , Tao Qinlin , Zhong Yu , Li Yangbo , He Xiangrui , Wan Sui , Huang Shanni , Ma Yiming , Qu Zitong , Yu Shimin , Huang Zhangsheng , Lei Chi , Yang Qinghu , Liu Jiaxing , Xue Fengming , Zhao Chuanxu , Yang Junhui , Chen Zili , Yang Jingmin , Xiao Shengyang , Xue Shiwei , Geng Wentao , Zhang Jian , Tao Xiong , Hao Zhigang , Li Qiong , Xiong Jinyu , Cai Huakun , Zhang Mingzhu , Zhang Yaping , Zhao Yangming , Zhao Qiancheng , Bai Wei , Jiao Shaodong , Han Dongliang , Peng Shiyi , Dong Jiaolong , Yang Qinglong , Gu Fan , Wang Zhaosu , Wang Hao , Yang Shu , Zhao Yang , Lin Wang , Fan Guoyao , Dong Kehong , Ren Xiehang , Li Feng , Deng Ce , Han Feng , Liu Jing , Wu Qiqi , Xie Fei , Zhong Yujie , Wei Zinan , Qing Wanjun , Han Chu , Ye Hui , Zhang Xiaobo , Jiang Yingzhou , Mou Lingke , Yang Chengyu , Li Shuhao , Yuan Jianjun , Chen Haojie , Liu Xiaobo , Shang Wentong , Guan Shengyuan , Tang Chouyao , Li Sheng , Gao Jiamao , Weng Wenting , Xiong Shouqi , Gao Yuan , Zhang Zhichao , Zhu Boliang , He Fuyou , Wu Feiyang , Zha Xianqian , Guo Tong , Xie Xiaohan , Xu Ruiyang , Zhang Weikang , Jiao Zixiao , Fu Chupin , Guo Chengzhi , He Sifen , Jiang Yixing , Kong Xianghao , Li Cunkai , Li Feng , Li Zhen , Liu Renzhe , Tian Ye , Wang Wenshan , Wang Yuhan , Wang Zutao , Xu Dengfeng , Yang Wendi , Zhu Bangyou , Zhu Guangding , Mou Xiating , Liu Xianlong , Jin Ziyang , Wang Jiaming , Cao Xinyu , Wu Yifan , Han Cheng , Chen Yanqiu , Liu Fanxi , Wang Haiqing , Xie Wei , Wang Wen , Yang Yutong , Wang Shaoyu , Mao An , Zhang Peilong , Zhao Yanhao , Ma Hengbun , Li Zhiheng , Li Keze , Luo Qiang , Huang Yuting , Xiao Menghan , Huang Yifei , Zou Guinan , Wang Yajun , Zhang Dunrui , Zhang Zhi , Guo Chaoxiang , Hu Bo , Zhang Dengkuo , Zhang Junang , Guo Jinlong , Wang Nan , Fu Qixiong , Zhang Yisong , Guo Jiong , Yu Yinlong , Lin Weijie , Wang Liye , Li Jingtao , Hou Zhangrong , Yi Xiaopeng , Zhang Yi , Luo Runyu , Xuan Zijian , Jiang Xiping , Nie Zisen , Meng Zhiyu , Jiang Ziying , Fang Xinyu , Huang Yuxuan , Peng Ning , Jin Xinyi , Zhang Yujun , Li Zhongkai , Zhang Yuchen , Fu Weimin , Dong Zijuan , Liu Yuhuan , Hu Anqi , Guo Zekai , Ye Weijie , Du Zhenchang , Zhou Xun , Tang Zhiyu , Guo Yan , Yang Zhiwen , Yao Xinchen , Yu Zezhi , Zhao Boyu , Wang Ruomu , Sun Yuwei , Wang Haocheng , Zheng Tianyu , Lu Chaofan , Wang Tianjing , Li Zhuolong , Fu Xiangyu , Deng Yulong , Yu Haojun , Sheng Yuan , Sun Yuanji , Mao Zi’an , Yu Lei , Ye Shaohua , Zhang Wenjie , Jiang Qihang , Zhou Yushen , Zhu Jianfeng , Liu Kexu , Mao Jinqiang , Han Yunxiao , Mai Zhihao , Zou Huchuan , Zheng Jianliang , Liu Zhiqiang 
Published: March 2024

Abstract
The J-TEXT capability is enhanced compared to two years ago with several upgrades of its diagnostics and the increase of electron cyclotron resonance heating (ECRH) power to 1 MW. With the application of electron cyclotron wave (ECW), the ECW assisted plasma startup is achieved; the tearing mode is suppressed; the toroidal injection of 300 kW ECW drives around 24 kA current; fast electrons are generated with toroidal injected ECW and the runaway current conversion efficiency increases with ECRH power. The mode coupling between 2/1 and 3/1 modes are extensively studied. The coupled 2/1 and 3/1 modes usually lead to major disruption. Their coupling can be either suppressed or avoided by external resonant magnetic perturbation fields and hence avoids the major disruption. It is also found that the 2/1 threshold of external field is significantly reduced by a pre-excited 3/1 mode, which can be either a locked island or an external kink mode. The disruption control is studied by developing prediction methods capable of cross tokamak application and by new mitigation methods, such as the biased electrode or electromagnetic pellet injector. The high-density operation and related disruptions are studied from various aspects. Approaching the density limit, the collapse of the edge shear layer is observed and such collapse can be prevented by applying edge biasing, leading to an increased density limit. The density limit is also observed to increase, if the plasma is operated in the poloidal divertor configuration or the plasma purity is increased by increasing the pre-filled gas pressure or ECRH power during the start-up phase.