Effect of the relative phase between pre-existing 2/1 and 3/1 magnetic islands on the suppression of runaway electrons on J-TEXT  

作　　者：熊金玉 江中和 焦子啸 李振 梁云峰 陈忠勇 丁永华 J-TEXT Team Jin-Yu Xiong;Zhong-He Jiang;Zi-Xiao Jiao;Zhen Li;Yun-Feng Liang;Zhong-Yong Chen;Yong-Hua Ding;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,China;Yangtze Memory Technologies Co.,Ltd.,Wuhan 430074,China;Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China;Forschungszentrum J¨ulich GmbH,Institut f¨ur Energie-und Klimaforschung-Plasmaphysik,J¨ulich 52425,Germany)

机构地区：[1]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,China [2]Yangtze Memory Technologies Co.,Ltd.,Wuhan 430074,China [3]Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China [4]Forschungszentrum J¨ulich GmbH,Institut f¨ur Energie-und Klimaforschung-Plasmaphysik,J¨ulich 52425,Germany

出　　处：《Chinese Physics B》2023年第7期71-77,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 12175078 and 51821005)

摘　　要：In the experiments of actively triggering plasma disruption by massive gas injection, the externally applied resonant magnetic perturbation has been used to mitigate the hazard of runaway electron(RE). Motivated by the experiment of multimode coupling to suppress REs on J-TEXT, some typical simulation cases with non-ideal MHD with rotation-open discussion(NIMROD) code are carried out to explore the influential mechanism of different relative phases between m/n =2/1 and m/n = 3/1 magnetic islands on the confinement of REs. Results show that the RE confinement is drastically affected by the relative phase between 2/1 and 3/1 magnetic islands. When the O point phase of 2/1 and 3/1 magnetic islands is toroidal 330°, REs can be effectively lost. The fitting curve of the remaining ratio of REs vs. the relative toroidal phase is predicted to approximate a sine-like function dependence. Further studies indicate that the phase difference between coexisting 2/1 and 3/1 islands can affect the radial transport of impurities. The loss of runaway electrons is closely related to the deposition effect of impurity. The impurity is easier to spread into the core region with smaller poloidal phase difference between the radial velocity of impurity and the impurity quantity of Ar.

关 键 词：major disruption runaway electron massive gas injection(MGI) resonant magnetic perturbation(RMP) 

分 类 号：TL631.24[核科学技术—核技术及应用]