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Helical equilibrium magnetohydrodynamic flow effects on the stability properties of low-n ideal external-infernal modes in weak shear tokamak configurations
CNR, IFP, Via R Cozzi 53, I-20125 Milan, Italy.
Ecole Polytech Fed Lausanne, 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.
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2019 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 61, no 6, article id 064003Article in journal (Refereed) Published
Abstract [en]

The impact of equilibrium helical flows on the stability properties of low shear tokamak plasmas is assessed. The corrections due to such helical flow to the equilibrium profiles (mass density, pressure, Shafranov shift, magnetic fluxes) are computed by minimising order by order the generalised Grad-Shafranov equation. By applying the same minimisation procedure, a set of three coupled equations, suitable for the study of magnetohydrodynamic perturbations localised within core or edge transport barriers is derived in circular tokamak geometry. We apply these equations to modelling the impact of strong poloidal flow shear in the edge region caused by a radial electric field on the stability of edge infernal modes retaining vacuum effects. Due to the poloidal flow shearing, the effect of plasma rotation is not simply a Doppler shift of the eigenfrequency. Stabilisation is found even for weak flow amplitude.

Place, publisher, year, edition, pages
2019. Vol. 61, no 6, article id 064003
Keywords [en]
magnetohydrodynamics, tokamak, infernal, edge harmonic oscillations
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-383498DOI: 10.1088/1361-6587/ab0f0bISI: 000466573500001OAI: oai:DiVA.org:uu-383498DiVA, id: diva2:1316446
Available from: 2019-05-17 Created: 2019-05-17 Last updated: 2019-05-17Bibliographically approved

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Wahlberg, Christer

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