Direct measurements of counter-streaming flows in a low-shear stellarator magnetic island topology
Abstract
We report on the first experimental verification of theoretically predicted multiple bundles of counter-streaming plasma flows in the island-divertor scrape-off layer (SOL) of the stellarator Wendelstein 7-X. In the standard toroidal field direction (counter-clockwise when looking from the top) experiments, the overall structure of the SOL flows, such as flow directions, the number of flow bundles and the magnitude of the flow velocities, are consistent with numerical predictions obtained with EMC3-EIRENE. However, the modelling does not predict changes of the flow patterns with reversal of the magnetic field direction, which are experimentally observed. This indicates that additional relevant physics, such as particle drifts, will need to be incorporated into the numerical model to better describe the whole stellarator scrape-off layer behaviour.
- Authors:
-
[1];
[2];
[1];
[1]
- Max-Planck-Institut für Plasmaphysik, Greifswald (Germany)
- Univ. of Wisconsin, Madison, WI (United States); Princeton Univ., NJ (United States)
- Auburn Univ., Auburn, AL (United States)
- Univ. of Wisconsin, Madison, WI (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- the W7-X Team
- OSTI Identifier:
- 1572710
- Grant/Contract Number:
- SC0014529; SC0014210
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 59; Journal Issue: 12; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; island divertor; magnetic islands; scrape-off layer; impurity transport; plasma flows; coherence imaging spectroscopy
Citation Formats
Perseo, Valeria, Effenberg, F., Gradic, D., König, R., Ford, O. P., Reimold, F., Ennis, D. A., Schmitz, O., and Sunn Pedersen, T. Direct measurements of counter-streaming flows in a low-shear stellarator magnetic island topology. United States: N. p., 2019.
Web. doi:10.1088/1741-4326/ab4320.
Perseo, Valeria, Effenberg, F., Gradic, D., König, R., Ford, O. P., Reimold, F., Ennis, D. A., Schmitz, O., & Sunn Pedersen, T. Direct measurements of counter-streaming flows in a low-shear stellarator magnetic island topology. United States. https://doi.org/10.1088/1741-4326/ab4320
Perseo, Valeria, Effenberg, F., Gradic, D., König, R., Ford, O. P., Reimold, F., Ennis, D. A., Schmitz, O., and Sunn Pedersen, T. Thu .
"Direct measurements of counter-streaming flows in a low-shear stellarator magnetic island topology". United States. https://doi.org/10.1088/1741-4326/ab4320. https://www.osti.gov/servlets/purl/1572710.
@article{osti_1572710,
title = {Direct measurements of counter-streaming flows in a low-shear stellarator magnetic island topology},
author = {Perseo, Valeria and Effenberg, F. and Gradic, D. and König, R. and Ford, O. P. and Reimold, F. and Ennis, D. A. and Schmitz, O. and Sunn Pedersen, T.},
abstractNote = {We report on the first experimental verification of theoretically predicted multiple bundles of counter-streaming plasma flows in the island-divertor scrape-off layer (SOL) of the stellarator Wendelstein 7-X. In the standard toroidal field direction (counter-clockwise when looking from the top) experiments, the overall structure of the SOL flows, such as flow directions, the number of flow bundles and the magnitude of the flow velocities, are consistent with numerical predictions obtained with EMC3-EIRENE. However, the modelling does not predict changes of the flow patterns with reversal of the magnetic field direction, which are experimentally observed. This indicates that additional relevant physics, such as particle drifts, will need to be incorporated into the numerical model to better describe the whole stellarator scrape-off layer behaviour.},
doi = {10.1088/1741-4326/ab4320},
journal = {Nuclear Fusion},
number = 12,
volume = 59,
place = {United States},
year = {Thu Sep 26 00:00:00 EDT 2019},
month = {Thu Sep 26 00:00:00 EDT 2019}
}
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Works referencing / citing this record:
Coherence imaging spectroscopy at Wendelstein 7-X for impurity flow measurements
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