Abstract
Tokamak experiments at near-unity aspect ratio offer new insights into the self-organized -mode plasma confinement regime. In contrast to conventional plasmas, the power threshold is higher than scaling predictions, and it is insensitive to magnetic topology, consistent with modeling. Edge localized mode (ELM) instabilities shift to lower toroidal mode numbers as decreases. These ultralow- operations enable heretofore inaccessible measurements through an ELM that show a complex multimodal collapse and the ejection of a current-carrying filament.
- Received 16 April 2014
DOI:https://doi.org/10.1103/PhysRevLett.116.175001
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