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Impact of divertor geometry on H-mode confinement in the JET metallic wall
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2017 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 57, no 8, article id 086025Article in journal (Refereed) Published
Abstract [en]

Recent experiments with the ITER-like wall have demonstrated that changes in divertor strike point position are correlated with strong modification of the global energy confinement. The impact on energy confinement is observable both on the pedestal confinement and core normalised gradients. The corner configuration shows an increased core density gradient length and ion pressure indicating a better ion confinement. The study of neutral re-circulation indicates the neutral pressure in the main chamber varies inversely with the energy confinement and a correlation between the pedestal total pressure and the neutral pressure in the main chamber can be established. It does not appear that charge exchange losses nor momentum losses could explain this effect, but it may be that changes in edge electric potential are playing a role at the plasma edge. This study emphasizes the importance of the scrape-off layer (SOL) conditions on the pedestal and core confinement.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2017. Vol. 57, no 8, article id 086025
Keywords [en]
divertor, confinement, neutrals
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-211328DOI: 10.1088/1741-4326/aa6e1cISI: 000404721100003OAI: oai:DiVA.org:kth-211328DiVA, id: diva2:1129306
Note

QC 20170802

Available from: 2017-08-02 Created: 2017-08-02 Last updated: 2017-08-02Bibliographically approved

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