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Neutral pathways and heat flux widths in vertical- and horizontal-target EDGE2D-EIRENE simulations of JET
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
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Number of Authors: 12262018 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 58, no 9, article id 096029Article in journal (Refereed) Published
Abstract [en]

This paper further analyses the EDGE2D-EIRENE simulations presented by Chankin et al (2017 Nucl. Mater. Energy 12 273), of L-mode JET plasmas in vertical-vertical (VV) and Vertical-horizontal (VH) divertor configurations. As expected, the simulated outer divertor ionisation source peaks near the separatrix in VV and radially further out in VH. We identify the reflections of recycled neutrals from lower divertor tiles as the primary mechanism by which ionisation is concentrated on the outer divertor separatrix in the VV configuration. These lower tile reflection pathways (of neutrals from the outer divertor, and to an even greater extent from the inner divertor) dominate the outer divertor separatrix ionisation. In contrast, the lower-tile-reflection pathways are much weaker in the VII simulation and its outer divertor ionisation is dominated by neutrals which do not reflect from any surfaces. Interestingly, these differences in neutral pathways give rise to strong differences in the heat flux density width lambda(q) at the outer divertor entrance: lambda(q) = 3.2 mm in VH compared to lambda(q) = 11.8 mm in VV. In VH, a narrow channel exists in the near scrape-off-layer (SOL) where the convected heat flux, driven by strong E-r x B flow and thermoelectric current, dominates over the conducted heat flux. The width of this channel sets lambda(q) and is determined by the radial distance between the separatrix and the ionisation peak in the outer divertor.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2018. Vol. 58, no 9, article id 096029
Keywords [en]
neutral pathways, divertor configuration, heat flux width, EDGE2D-EIRENE
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-398261DOI: 10.1088/1741-4326/aacf0fISI: 000438686500004OAI: oai:DiVA.org:uu-398261DiVA, id: diva2:1375827
Note

For complete list of authors see http://dx.doi.org/10.1088/1741-4326/aacf0f

Available from: 2019-12-06 Created: 2019-12-06 Last updated: 2019-12-06Bibliographically approved

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Andersson Sundén, ErikCecconello, MarcoConroy, SeanEricsson, GöranEriksson, JacobHjalmarsson, AndersPossnert, GöranSjöstrand, HenrikWeiszflog, Matthias

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Andersson Sundén, ErikCecconello, MarcoConroy, SeanEricsson, GöranEriksson, JacobHjalmarsson, AndersPossnert, GöranSjöstrand, HenrikWeiszflog, Matthias
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Applied Nuclear PhysicsHigh Energy Physics
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