Overview of core impurity transport in the first divertor operation of Wendelstein 7-X

The impurity transport at Wendelstein 7-X during its most recent campaign is characterized and documented for a variety of different plasma scenarios. An overview of its dependence on several quantities is given, which allows identification of transport regimes and the major driver for impurity tran...

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Bibliographic Details
Published inJournal of plasma physics Vol. 89; no. 3
Main Authors Wegner, Th, Bähner, J.-P., Buttenschön, B., Langenberg, A., von Stechow, A.
Format Journal Article
LanguageEnglish
Published Cambridge, UK Cambridge University Press 01.06.2023
Subjects
Density
Density dependence
Eddy diffusion
Impurities
Magnetic fields
Plasma
Plasma physics
Scaling laws
Stellarators
Temperature
The 23rd International Stellarator-Heliotron Workshop (ISHW)
Turbulence
Turbulent diffusion
plasma confinement
fusion plasma
plasma diagnostics
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Summary:The impurity transport at Wendelstein 7-X during its most recent campaign is characterized and documented for a variety of different plasma scenarios. An overview of its dependence on several quantities is given, which allows identification of transport regimes and the major driver for impurity transport. Beyond this, a comparison with the impurity behavior in other fusion devices is now possible. In contrast to other stellarators, no density dependence of the impurity transport has been found. Additionally, the influence of the turbulence contribution to the overall transport is reflected in the dependence on various parameters, e.g. turbulent diffusion and density fluctuation amplitudes. With this database approach, one can now also apply scaling laws to make extrapolations about the impurity confinement in future plasma scenarios.
ISSN:0022-3778
1469-7807
DOI:10.1017/S0022377823000417