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MHD Equilibrium with Reversed Current Density and magnetic islands Revisited:the Vacuum Vector Potential Calculus

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Plasma Science and Technology 2013年第10期15卷 985-988页

作者： F.L.BRAGA Gleb-Wataghin Physics Institute Applied Physics DepartmentState University of Campinas Federal Institute of Science and Technology of Espirito Santo

The solution of Grad-Shafranov equation determines the stationary behavior of fusion plasma inside a tokamak. To solve the equation it is necessary to know the toroidal current density profile. Recent works show that it is possible to determine a magnetohydrodynamic （MHD） equilibrium with reversed current density （RCD） profiles that presents magnetic islands. In this work we show analytical MHD equilibrium with a RCD profile and analyze the structure of the vacuum vector potential associated with these equilibria using the virtual casing principle.

关键词： magnetohydrodynamics vacuum vector potential reversed current density magnetic islands

RCD Large Aspect-Ratio Tokamak Equilibrium with magnetic islands:a Perturbed Approach

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Communications in Theoretical Physics 2013年第3期59卷 375-378页

作者： F.L.Braga Instituto de Física Gleb Wataghin Departamento de Física AplicadaUniversidade Estadual de CampinasCampinasSP13083-859Brasil Instituto Federal de Ci encias e Tecnologia do Esp' rito Santo Campus Santa TeresaES29600-000Brasil

Solutions of Grad-Shafranov （CS） equation with Reversed Current Density （RCD） profiles present mag- netic islands when the magnetic flux is explicitly dependent on the poloidal angle. In this work it is shown that a typical cylindrical （large aspect-ratio） RCD equilibrium configuration perturbed by the magnetic field of a circular loop （simulating a divertor） is capable of generate magnetic islands, due to the poloidal symmetry break of the GS equilibrium solution.

关键词： symmetry break magnetic islands Grad-Shafranov equation reversed current density

Gyrokinetic simulation of magnetic-island-induced electric potential vortex mode

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Plasma Science and Technology 2024年第1期26卷 34-41页

作者：王丰李继全曲洪鹏彭晓东 Southwestern Institute of Physics Chengdu 610041People’s Republic of China

Ion temperature gradient(ITG)-driven turbulence with embedded static magnetic islands is simulated by utilizing a gyrokinetic theory-based global turbulence transport code(GKNET)in this *** from the traditional equilibrium circular magnetic-surface average(EMSA)method,an advanced algorithm that calculates the perturbed magnetic-surface average(PMSA)of the electric potential has been developed to precisely deal with the zonal flow component in a non-circular magnetic surface perturbed by magnetic *** show that the electric potential vortex structure inside islands induced by the magnetic islands is usually of odd parity when using the EMSA *** is found that the odd symmetry vortex can transfer into an even one after a steep zonal flow gradient,*** flow shear has been built in the vicinity of the magnetic islands by adopting the PMSA *** phase of the potential vortex in the poloidal cross section is coupled with the zonal flow *** an electric potential vortex mode may be of essential importance in wide topics,such as the turbulence spreading across magnetic islands,neoclassical tearing mode physics,and also the interaction dynamics between the micro-turbulence and MHD activities.

关键词： magnetic islands electric vortex ITG perturbed magnetic flux surface average