题    目：Physics of kinetic Alfvén waves:a gyrokinetic theory Approach

报告人：陈骝 (教授)，Institute for Fusion Theory and Simulation and Department of Physics, Zhejiang University, Hangzhou, China and Department of Physics and Astronomy, University of California, Irvine, USA  

时    间：2021年5月31日&6月1日（周一&周二）上午9:30

地    点：聚变所二楼大会议室

摘    要：The transverse shear Alfvén wave (SAW) is a fundamental anisotropic electromagnetic oscillation in plasmas with a finite background magnetic field. In realistic plasmas with spatial inhomogeneities, SAW exhibits the interesting spectral feature of a continuous spectrum. That is, the SAW oscillation frequency varies in the nonuniform direction. As a consequence, any initial perturbation of SAW structures will evolve eventually into short-wavelength kinetic Alfvén wave (KAW).In this talk, we will employ the powerful nonlinear gyrokinetic theory and consider both the linear and nonlinear physics of KAWs. Available results from numerical simulations as well as satellite observations will also be discussed. We emphasize, in particular, that due to the enhanced electron–ion de-coupling in the short-wavelength regime, KAWs possess significantly enhanced nonlinear coupling coefficients and, thereby, play important roles in the heating, acceleration, and transport processes of charged particles in magnetized plasmas.

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