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Strongly driven surface-global kinetic ballooning modes in general toroidal geometry

Part of: PLA 17th European Fusion Theory Conference Focus on Fusion

Published online by Cambridge University Press:  20 June 2018

A. Zocco Open the ORCID record for A. Zocco [Opens in a new window] ,
K. Aleynikova  and
P. Xanthopoulos
A. Zocco*
Affiliation:
Max-Planck-Institut für Plasmaphysik, D-17491, Greifswald, Germany
K. Aleynikova
Affiliation:
Max-Planck-Institut für Plasmaphysik, D-17491, Greifswald, Germany Moscow Institute of Physics and Technology, Dolgoprudny, Russian Federation
P. Xanthopoulos
Affiliation:
Max-Planck-Institut für Plasmaphysik, D-17491, Greifswald, Germany
*
†Email address for correspondence: Alessandro.zocco@ipp.mpg.de
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Abstract

Kinetic ballooning modes in magnetically confined toroidal plasmas are investigated putting emphasis on specific stellarator features. In particular, we propose a Mercier criterion which is purposely designed to allow for direct comparison with local flux-tube gyrokinetics simulations. We investigate the influence on the marginal frequency of the mode of a magnetic curvature which is inhomogeneous on the magnetic flux surface due to the fieldline-label dependence. This is a typical (surface) global effect present in non-axisymmetry. Finally, we propose an artificial equilibrium model that explicitly retains the fieldline-label dependence in the magnetic drift, and analyse the stability of the system by introducing a representation of the perturbations similar to the flux-bundle model of Sugama et al. (Plasma Fusion Res., vol. 7, 2012, 2403094). The coupling of flux bundles is shown to have a stabilising effect on the most unstable local flux-tube mode.

Keywords

fusion plasmaplasma instabilities
Type
Research Article
Information
Journal of Plasma Physics , Volume 84 , Issue 3 , June 2018 , 745840303
Copyright
© Cambridge University Press 2018 

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