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A 3D approach to equilibrium, stability and transport studies in RFX-mod improved regimes
Consorzio RFX.
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2010 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 52, no 12, 124023- p.Article in journal (Refereed) Published
Abstract [en]

The full three-dimensional (3D) approach is now becoming an important issue for all magnetic confinement configurations. It is a necessary condition for the stellarator but also the tokamak and the reversed field pinch (RFP) now cannot be completely described in an axisymmetric framework. For the RFP the observation of self-sustained helical configurations with improved plasma performances require a better description in order to assess a new view on this configuration. In this new framework plasma configuration studies for RFX-mod have been considered both with tools developed for the RFP as well as considering codes originally developed for the stellarator and adapted to the RFP. These helical states are reached through a transition to a very low/reversed shear configuration leading to internal electron transport barriers. These states are interrupted by MHD reconnection events and the large Te gradients at the barriers indicate that both current and pressure driven modes are to be considered. Furthermore the typically flat Te profiles in the helical core have raised the issue of the role of electrostatic and electromagnetic turbulence in these reduced chaos regions, so that a stability analysis in the correct 3D geometry is required to address an optimization of the plasma setup. In this viewtheVMECcode proved to be an effectiveway to obtain helical equilibria to be studied in terms of stability and transport with a suite of well tested codes. In this work, the equilibrium reconstruction technique as well as the experimental evidence of 3D effects and their first interpretation in terms of stability and transport are presented using both RFP and stellarator tools.

Place, publisher, year, edition, pages
2010. Vol. 52, no 12, 124023- p.
Keyword [en]
3D effects, 3D geometry, A-stability, Approach to equilibrium, Axisymmetric, Electromagnetic turbulence, Electron transport, Equilibrium reconstruction, Experimental evidence, Helical configuration, Helical equilibria, Helical state, Magnetic confinement, Plasma configuration, Plasma performance, Pressure-driven, Reversed field pinch, Three-dimensional (3D), Fusion reactors, Magnetohydrodynamics, Magnetoplasma, Phase equilibria, Plasma devices, Plasma stability, Three dimensional
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-50845DOI: 10.1088/0741-3335/52/12/124023ISI: 000286181100024OAI: diva2:466360
QC 20111216Available from: 2011-12-15 Created: 2011-12-08 Last updated: 2011-12-16Bibliographically approved

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