Nonlinear MHD Simulations

摘要

@@ Ⅲ.4.1Introductionrn Understanding MHD instability dynamics is a key issue for burning plasmas. Important MHD modes ranging from the plasma center to the edge include sawtooth oscillations and fishbone (center), ballooning modes and neoclassical tearing modes (core), external kink-ballooning modes (core/edge), and peeling-ballooning modes or edge localized modes (edge). In particular, sawtooth oscillations affect the central plasma profiles and can seed neoclassical tearing modes. Neoclassical tearing modes, ideal ballooning modes and kink modes all set a limit to the plasma beta, above which the plasma is vulnerable to disruptions. ELM dynamics determines the H-mode pedestal's height and width, which in turn determines the core plasma confinement.