Magnetohydrodynamic simulation study of impurity radiation-excited and driven tearing mode  

作　　者：Yiming ZU Zhiwei MA Yuchen XU 祖一鸣;马志为;徐宇晨(Institute for Fusion Theory and Simulation,Zhejiang University,Hangzhou 310027,People’s Republic of China;School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,People’s Republic of China)

机构地区：[1]Institute for Fusion Theory and Simulation,Zhejiang University,Hangzhou 310027,People’s Republic of China [2]School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,People’s Republic of China

出　　处：《Plasma Science and Technology》2025年第3期22-29,共8页等离子体科学和技术(英文版)

基　　金：supported by the National Magnetic Confinement Fusion Energy R&D Program of China (Nos.2019YFE03030004 and 2022YFE03100001)。

摘　　要：Tearing modes may play an important role in the density limit disruption.The Magnetohydrodynamic(MHD)code CLT with impurity modules is used to study the tearing mode excited and driven by impurity radiation.The impurity radiation can lead to plasma contraction and local enhancement of the current density.When the locally enhanced region of the current density approaches to the resonance surface,the tearing mode can be excited,even if the tearing mode is stable in the initial equilibrium.Through a scan of the initial atomic number(Z)and impurity concentrations,it is found that impurities with different Z values exhibit similar behaviors in the radiation-driven tearing mode.The impurity radiation can drive tearing mode growth through temperature cooling near the resonance surface,and there exists a linear relationship between the temperature perturbation caused by impurity radiation and the linear growth rate of the tearing mode.Additionally,the impurity can promote the growth of magnetic islands through the radiation cooling inside the magnetic island,and there exists a correlation between the initial parameters of impurity and the width of the saturated magnetic island.

关 键 词：impurity radiation tearing mode MHD simulation 

分 类 号：O48[理学—固体物理]