题   目： Theory of mean E×B shear in a stochastic magnetic field for L-H transition in tokamaks

报告人： 郭伟欣副教授，华中科技大学

时   间： 2023年04月25日（周二）  上午 10：00 

地   点： 聚变科学所二楼大会议室

摘   要： The mean E × B shear in a stochastic magnetic field is calculated, using the radial force balance relation and transport equations. This analysis is relevant to the L → H transition with resonant magnetic perturbations, and special focus is placed upon the physics of non-ambipolar transport and radial current. The key physical process is the flow of fluctuating currents along wandering magnetic fields. The increments in poloidal and toroidal rotation, density and ion pressure are calculated. The radial envelope of the magnetic perturbations inside the plasma defines a new scale lenv, which is the characteristic scale of the magnetic fluctuation intensity profile. The net particle outflow due to stochastic magnetic fields is calculated and is determined by the net radial current through the separatrix. Implications for the L → H transition are discussed. 

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