Non-linear simulations of ELMs in ASDEX Upgrade including diamagnetic drift effects

摘要

Introduction Edge-localized modes (ELMs) are relaxation-like oscillatory instabilities at the boundary of Hmode plasmas. They eject particles and energy into the scrape-off layer (SOL) on very short time-scales and are driven both by the steep pressure gradient as well as the high bootstrap current in the pedestal region of an H-mode plasma. While they are a mean to control impurity and particle density, extrapolations of experimental data indicate that in devices like ITER the high transient heat loads on plasma-facing components and in particular the divertor targets are beyond the tolerance level of present-day materials. It is therefore important to study ELMs both theoretically and experimentally in order to reveal their fundamental properties which is necessary for the prediction of ELMs and the design of ELM mitigation systems in ITER and DEMO. We present first ELM simulations for ASDEX Upgrade (AUG) including diamagnetic drift effects and investigate the influence of the diamagnetic terms onto the evolution of the toroidal mode spectrum.