Nonlinear evolution and secondary island formation of the double tearing mode in a hybrid simulation  

作　　者：Aohua MAO Zhibin WANG Xianglei HE Xiaogang WANG 毛傲华;王志斌;何向磊;王晓钢(School of Physics,Harbin Institute of Technology,Harbin 150001,People's Republic of China;Laboratory for Space Environment and Physical Sciences,Harbin Institute of Technology,Harbin 150001,People's Republic of China;Sino French Institute of Nuclear Engineering and Technology,Sun Yat sen University,Zhuhai 519082,People's Republic of China)

机构地区：[1]School of Physics,Harbin Institute of Technology,Harbin 150001,People's Republic of China [2]Laboratory for Space Environment and Physical Sciences,Harbin Institute of Technology,Harbin 150001,People's Republic of China [3]Sino French Institute of Nuclear Engineering and Technology,Sun Yat sen University,Zhuhai 519082,People's Republic of China

出　　处：《Plasma Science and Technology》2021年第3期57-67,共11页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.11705039,11975087,and 42011530086);the China Postdoctoral Science Foundation(No.2018M631918);the Heilongjiang Postdoctoral Foundation(No.184744)。

摘　　要：Double tearing modes(DTMs),induced by double current sheet configurations or two neighboring rational surfaces with the same safety factor in tokamaks,are widely observed in solar,space,and fusion plasmas.In this paper,the evolution of DTMs without a guide field is investigated numerically using a hybrid model(electron fluid+ion PIC).The overall evolution processes of DTMs are qualitatively consistent with previous works using other models.The particle dynamics during the evolution of DTMs is analyzed in detail.Behaviors of ions and electrons present different characteristics around the reconnection region which gives rise to Hall effects producing the out-of-plane quadrupole magnetic field.In the explosive reconnection process with interactions between two DTMs islands,the asymmetric drive and the thin current layer feature lead to the emergence of secondary magnetic islands which develop with the late evolution of the DTMs.

关 键 词：double tearing mode hybrid-PIC simulation fast reconnection secondary islands 

分 类 号：TL612[核科学技术—核技术及应用]