Effects of plasma radiation on the nonlinear evolution of neo-classical tearing modes in tokamak plasmas with reversed magnetic shear  

作　　者：姜帅 王正汹 魏来 刘桐 Shuai Jiang;Zheng-Xiong;WangLai Wei;Tong Liu(Key Laboratory of Materials Modification by Beams of the Ministry of Education,School of Physics,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]Key Laboratory of Materials Modification by Beams of the Ministry of Education,School of Physics,Dalian University of Technology,Dalian 116024,China

出　　处：《Chinese Physics B》2023年第10期548-555,共8页中国物理B（英文版）

基　　金：Project supported by the National Key R&D Program of China(Grant No.2022YFE03090000);the National Natural Science Foundation of China(Grant No.11925501);the Fundament Research Funds for the Central Universities(Grant No.DUT22ZD215)。

摘　　要：Effects of plasma radiation on the nonlinear evolution of neo-classical double tearing modes(NDTMs)in tokamak plasmas with reversed magnetic shear are numerically investigated based on a set of reduced magnetohydrodynamics(MHD)equations.Cases with different separations △_(rs)=|r_(s2)-r_(s1)|between the two same rational surfaces are considered.In the small △_(rs)cases,the plasma radiation destabilizes the NDTMs and makes the kinetic energy still grow gradually in the late nonlinear phase.Moreover,the NDTM harmonics with high mode numbers reach a high level in the presence of plasma radiation,forming a broad spectrum of MHD perturbations that induces a radially broadened region of MHD turbulence.As a result,the profiles of safety factors also enter a nonlinear oscillation phase.In the intermediate △_(rs)case,the plasma radiation can advance the explosive burst of kinetic energy that results from the fast driven reconnection between the two rational surfaces,because it can further promote the destabilizing effects of bootstrap current perturbation on the magnetic island near the outer rational surfaces.In the large △_(rs)case,through destabilizing the outer islands significantly,the plasma radiation can even induce the explosive burst in the reversed magnetic shear configuration where the burst cannot be induced in the absence of plasma radiation.

关 键 词：neoclassical tearing mode MAGNETOHYDRODYNAMICS nonlinear phenomena 

分 类 号：TL631.24[核科学技术—核技术及应用]