Edge profile and MHD characterization of the type-II ELMy regime in ASDEX Upgrade

摘要

1. Introduction Plasma regimes which combine high global confinement, high pedestal pressure and small ELMs are especially interesting for ITER in view of the limited power load estimated for the divertor target plates [1]. Such small ELM regimes have previously been found in several machines (for an overview see. e. g. [2].). In particular the question of whether there is a significant difference between grassy ELMs observed at JT60-U, JET and AUG at low collisionalities and type-II ELMs observed at JET and AUG at high collisionalities [3] has triggered the experiments reported here.