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Physics of the electric field in the scrape-off layer in ASDEX Upgrade L-mode discharges and comparison to experiments
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SYSNO ASEP 0563273 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Physics of the electric field in the scrape-off layer in ASDEX Upgrade L-mode discharges and comparison to experiments Author(s) Brida, D. (DE)
Conway, G.D. (DE)
Adámek, Jiří (UFP-V) RID, ORCID
Silvagni, D. (DE)
David, P. (DE)
Eich, T. (DE)
Grenfell, G. (DE)
Komm, Michael (UFP-V) RID, ORCID
Plank, U. (DE)Number of authors 9 Article number 101262 Source Title Nuclear Materials and Energy. - : Elsevier
Roč. 33, October (2022)Number of pages 7 s. Language eng - English Country NL - Netherlands Keywords ASDEX Upgrade ; Electric field ; sol Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Method of publishing Open access Institutional support UFP-V - RVO:61389021 UT WOS 000868495300001 EID SCOPUS 85139591318 DOI 10.1016/j.nme.2022.101262 Annotation The electric field in the Scrape-Off Layer (SOL) of fusion plasmas is a key quantity affecting the local plasma transport and possibly also the overall plasma confinement. However, the physics determining the SOL electric field is experimentally not well investigated. In this study a systematic experimental analysis of the electric field in AUG L-mode discharges at various plasma currents, densities and heating powers is presented. In particular, the relation of the electric field to the divertor condition, as measured by Langmuir probes, is analyzed in detail by applying a simplified form of Ohm's law. The analysis shows that the peak value of the radial electric field E-r in the near SOL measured by Doppler reflectometry decreases from about 8 kV/m at the lowest densities to2 kV/m at the highest densities, which is accompanied by a flattening of the outer divertor target electron temperature profiles. The electric field obtained by integrating Ohm's law from the divertor target to the midplane agrees with E-r in the near SOL within the uncertainties, evidencing the quantitative validity of the underlying model. Based on the findings about the relation between the electric field and the target conditions, a scaling to obtain the maximum of E-r in the SOL in terms of upstream parameters is developed. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2023 Electronic address https://www.sciencedirect.com/science/article/pii/S2352179122001430?via%3Dihub
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