Effects of Plasma Boundary Shape on Explosive Bursts Triggered by Tearing Mode in Toroidal Tokamak Plasmas with Reversed Magnetic Shear  

作　　者：王浩宇 王正汹 刘桐 朱霄龙 Haoyu Wang;Zheng-Xiong Wang;Tong Liu;Xiao-Long Zhu(Key Laboratory of Materials Modification by Beams(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(Ministry of Education),School of Physics,Dalian University of Technology,Dalian 116024,China

出　　处：《Chinese Physics Letters》2023年第7期33-39,共7页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11925501,12105034,and 12205034);the Fundamental Research Funds for the Central Universities(Grant Nos.DUT22ZD215)。

摘　　要：Numerical research is conducted to investigate the effects of plasma boundary shape on the tearing mode triggering explosive bursts in toroidal tokamak plasmas.In this work,m/n=2/1 mode is responsible for the triggering of the explosive burst.Plasma boundary shape can be adjusted via the adjustment of the parameters triangularityδand elongationκ.The investigations are conducted both under lowβ(close to zero)and under finiteβregimes.In the lowβregime,triangularity and elongation both have stabilizing effect on the explosive burst,and the stabilizing effect of elongation is stronger.Under a large elongation(κ=2.0),the elongation effect can evidently enhance the stabilizing effect in a positive triangularity regime,but barely affects the stabilizing effect in a negative triangularity regime.In the finiteβregime,the explosive burst is delayed in comparison with that in the lowβregime.Similar to the lowβcases,the effects of triangularity and elongation both are stabilizing.Under a large elongation(κ=2.0),the elongation effect can evidently enhance the stabilizing effect on the explosive burst in a positive triangularity regime,but impair the stabilizing effect in a negative triangularity regime.The explosive burst disappears in the large triangularity case(δ=0.5),indicating that the explosive burst can be effectively prevented in experiments via carefully adjusting plasma boundary shape.Moreover,strong magnetic stochasticity appears in the negative triangularity case during the nonlinear phase.

关 键 词：REGIME TRIANGULAR stabilizing 

分 类 号：TL631.24[核科学技术—核技术及应用] TL612