Triggering of tearing instability by impurity radiation through resistive interchange reversal in a tokamak

Nuclear Fushion

article

Shiyong Zeng¹  Ping Zhu²  Ruijie Zhou⁴  Dominique Frank Escande⁵ 

[1] Department of Engineering and Applied Physics, University of Science and Technology of China;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;Department of Engineering Physics, University of Wisconsin-Madison;Institute of Plasma Physics, Chinese Academy of Sciences;Aix-Marseille University

关键词: tearing mode;    impurity radiation;    resistive interchange;    thermal instability;    Pfirsch–Schlüter current;    magnetic island growth;   

DOI  :  10.1088/1741-4326/aca687

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

Recent MHD simulations find that the reversal of the local resistive interchange parameter D_mathrm{R}from negative to positive due to impurity radiation cooling is able to linearly destabilize the resistive tearing mode (TM) growth in a tokamak above a threshold in impurity level. A layer of perturbed Pfirsch–Schlüter current density and resistivity are also induced by the impurity radiation, which further govern the TM growth and saturation in the nonlinear stage. The impurity threshold and the TM growth strongly depend on the parallel thermal conductivity, and such a dependence derives from the impact on D_mathrm{R}of the fast parallel thermal equilibration along the helical magnetic field lines.

【 授权许可】

Unknown