Phys. Rev. Lett. 100, 115001 (2008) [4 pages]Edge-Localized Modes Explained as the Amplification of Scrape-Off-Layer Current CouplingReceived 27 September 2007; published 19 March 2008 It is shown that the edge-localized modes (ELMs) observed in tokamak H mode discharges can be explained as external magnetohydrodynamic (MHD) mode amplification due to coupling with scrape-off-layer current. The proposed model offers a new ELM mechanism that produces a sharp onset and initial fast growth of magnetic perturbations even when the underlying equilibrium is only marginally unstable for a MHD mode and also a quick quenching after the bursting peak. The theory also reproduces various other ELM features. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.115001
DOI:
10.1103/PhysRevLett.100.115001
PACS:
52.35.Py, 52.55.Fa, 52.55.Hc
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