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Analytic stability criteria for edge MHD oscillations in high performance ELM free tokamak regimes
CNR, IFP, Via R Cozzi 53, I-20125 Milan, Italy..
SPC, CH-1015 Lausanne, Switzerland..
CNR, IFP, Via R Cozzi 53, I-20125 Milan, Italy..
CNR, IFP, Via R Cozzi 53, I-20125 Milan, Italy.;SPC, CH-1015 Lausanne, Switzerland..
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2018 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 58, no 1, article id 014002Article in journal, Letter (Refereed) Published
Abstract [en]

A new dispersion relation, and associated stability criteria, is derived for low-n external kink and infernal modes, and is applied to modelling the stability properties of quiescent H-mode like regimes. The analysis, performed in toroidal geometry with large edge pressure gradients associated with a local flattening of the safety factor, includes a pedestal, sheared toroidal rotation and a vacuum region separating the plasma from an ideal metallic wall. The external kink-infernal modes found here exhibit similarities with experimentally observed edge harmonic oscillations.

Place, publisher, year, edition, pages
2018. Vol. 58, no 1, article id 014002
Keywords [en]
magnetohydrodynamics, tokamak, infernal mode, edge harmonic oscillations
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-341968DOI: 10.1088/1741-4326/aa9456ISI: 000414991100001OAI: oai:DiVA.org:uu-341968DiVA, id: diva2:1183860
Available from: 2018-02-19 Created: 2018-02-19 Last updated: 2018-02-19Bibliographically approved

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Wahlberg, Christer

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