Electric fields and stationary drift flows in the island divertor SOL of Wendelstein 7-X

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Carsten Killer, Dario Cipciar, Seung Gyou Baek, Sean B. Ballinger, Adrian von Stechow, James L. Terry, Olaf Grulke, the W7-X Team, 2025, "Electric fields and stationary drift flows in the island divertor SOL of Wendelstein 7-X", https://doi.org/10.7910/DVN/R87QIZ, Harvard Dataverse, V1
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Description
In the island divertor scrape-off layer (SOL) of the Wendelstein 7-X stellarator, 2D-resolved Langmuir probe measurements uncover a complex spatial structure of electron temperature, density, and floating potential. Depending on details of magnetic island size and position, significant poloidal gradients and non-monotonic radial profiles are observed. The resulting electric fields imply the presence of sheared stationary drift flows with poloidal velocities of a few kms−1, with flow channels as narrow as one cm. Such flows are observed with a gas puff imaging diagnostic in qualitative agreement with the probe results and imply a significant transport channel in the SOL. The 2D distribution of plasma parameters is intricately associated with the unique magnetic structure of the island divertor SOL and highlights the necessity for more accurate magnetic field reconstructions.
Subject Physics
Keyword flow, gas puff imaging, island divertor, shear, SOL turbulence, W7-X
Notes CITATION: Carsten Killer et al 2025 Nucl. Fusion 65 056026

DOI: https://doi.org/10.1088/1741-4326/adc9c0

PSFC REPORT PSFC/JA-25-17

The authors thank Victoria Winters, IPP Greifswald, for support in the conduction of key experiments. This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No. 101052200—EUROfusion). Support for MIT participation was provided by the US Department of Energy, Fusion Energy Sciences, Award DESC0014251.

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