High Confinement Mode and Edge Localized Mode Characteristics in a Near-Unity Aspect Ratio Tokamak.
Phys Rev Lett
; 116(17): 175001, 2016 Apr 29.
Article
em En
| MEDLINE
| ID: mdl-27176526
ABSTRACT
Tokamak experiments at near-unity aspect ratio Aâ²1.2 offer new insights into the self-organized H-mode plasma confinement regime. In contrast to conventional Aâ¼3 plasmas, the L-H power threshold P_{LH} is â¼15× 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 A decreases. These ultralow-A operations enable heretofore inaccessible J_{edge}(R,t) measurements through an ELM that show a complex multimodal collapse and the ejection of a current-carrying filament.
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MEDLINE
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En
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2016
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Article