Nonlinear phase dynamics of ideal kink mode in the presence of shear flow

作     者：张毅 郭志彬 Yi ZHANG;Zhibin GUO

作者机构：State Key Laboratory of Nuclear Physics and TechnologyFusion Simulation CenterSchool of PhysicsPeking UniversityBeijing 100871People’s Republic of China 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2021年第23卷第4期

页      面：9-14页

核心收录：

学科分类：08[工学] 0827[工学-核科学与技术] 082701[工学-核能科学与工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the National MCF Energy R&D Program of China (No.2018YFE0311400) supported by the High-performance Computing Platform of Peking University 

主　　题：kink mode E×B flow nonlinear phase dynamics Richardson number 

摘      要：We investigate nonlinear phase dynamics of an ideal kink mode,induced by E×B flow.Here the phase is the cross phase(θ_(c))between perturbed stream function of velocity(f)and magnetic field(y),i.e.θ_(c)=θf−θψ.A dimensionless parameter,analogous to the R_(i)chardson number,R_(i)=16gkink w^(2)E^(2)(γkink:the normalized growth rate of the pure kink mode;wE:normalized E×B shearing rate)is defined to measure the competition between phase pinning by the current density and phase detuning by the flow shear.When R_(i)1,θ_(c) is locked to a fixed value,corresponding to the conventional eigenmode solution.When R_(i).1,θ_(c) enters a phase slipping or oscillating state,corresponding to a nonmodal solution.The nonlinear phase dynamics method provides a more intuitive explanation of the complex dynamical behavior of the kink mode in the presence of E×B shear flow.