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

Plasma Science and Technology 2021年第4期23卷 9-14页

作者：张毅郭志彬 State Key Laboratory of Nuclear Physics and Technology Fusion Simulation CenterSchool of PhysicsPeking UniversityBeijing 100871People’s Republic of China

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.

关键词： kink mode E×B flow nonlinear phase dynamics Richardson number

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Magnetohydrodynamic effect of internal transport barrier on EAST tokamak

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Plasma Science and Technology 2022年第3期24卷 71-79页

作者：储宇奇刘海庆张寿彪徐立清李二众揭银先连辉周天富冯喜张学习王云飞朱翔吴陈斌王守信杨曜 K HANADA 吕波李颖颖臧庆 EAST Team Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People's Republic of China University of Science and Technology of China Hefei 230026People's Republic of China University of California Los AngelesCalifornia 90095United States of America Interdisciplinary Graduate School of Engineering Sciences Kyushu UniversityKasuga 816-8580Japan Advanced Energy Research Center Shenzhen UniversityShenzhen 518060People's Republic of China Research Institute for Applied Mechanics Kyushu UniversityKasugaFukuoka 816-8580Japan

An internal transport barrier(ITB)can be formed on EAST in exploring high-parameter operation.Previous studies show that safety factor(q)profiles,Shafranov shift and magnetohydrodynamic behaviors could be helpful in ITB formation by suppressing anomalous transport.Recently,electron density evolution with high resolution demonstrates that fishbone could be dominant in electron density ITB formation and sustainment.The power threshold is low in the fishbone condition and the electron density profile is determined by traits of fishbone.Simulation shows that the low-k ion mode is suppressed by fishbone.Direct measurement of turbulence in the inner region shows that the internal kink mode could sustain an electron temperature ITB by suppressing the trapped electron mode.The multi-scale interaction between the kink mode and turbulence by current could be key in sustaining high-electron-temperature long-pulse operation.

关键词： ITB fishbone kink mode micro turbulence

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