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Charge-state independent anomalous transport for a wide range of different impurity species observed at Wendelstein 7-X

In this paper, the plasma volume averaged impurity confinement of selected charge states and impurity species has been characterized for the Stellarator Wendelstein 7-X (W7-X), covering a wide range of atomic charges (Z = 12–44) and atomic masses (M = 28–184). A comparison of the experimental findin...

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Bibliographic Details
Published in:Physics of plasmas 2020-05, Vol.27 (5)
Main Authors: Langenberg, A., Wegner, Th, Pablant, N. A., Marchuk, O., Geiger, B., Tamura, N., Bussiahn, R., Kubkowska, M., Mollén, A., Traverso, P., Smith, H. M., Fuchert, G., Bozhenkov, S., Damm, H., Pasch, E., Brunner, K.-J., Knauer, J., Beurskens, M., Burhenn, R., Wolf, R. C.
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Language:English
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Summary:In this paper, the plasma volume averaged impurity confinement of selected charge states and impurity species has been characterized for the Stellarator Wendelstein 7-X (W7-X), covering a wide range of atomic charges (Z = 12–44) and atomic masses (M = 28–184). A comparison of the experimental findings to theoretical neoclassical and turbulent transport expectations suggests, aside from/in addition to the neoclassical transport, an additional significant anomalous transport mechanism, which is not inconsistent with the predictions of a turbulence dominated impurity transport and is in agreement with the experimental results from recent transport studies based on the direct measurements of impurity diffusion profiles, performed at W7-X.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0004462