ERO modelling of local deposition of injected C-13 tracer at the outer divertor of JET
2009 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. T138, 014021- p.Article in journal (Refereed) Published
The 2004 tracer experiment of JET with the injection of (CH4)-C-13 into H-mode plasma at the outer divertor has been modelled with the Monte Carlo impurity transport code ERO. EDGE2D solutions for inter-ELM and ELM-peak phases were used as plasma backgrounds. Local two-dimensional (2D) deposition patterns at the vertical outer divertor target plate were obtained for comparison with post-mortem surface analyses. ERO also provides emission profiles for comparison with radially resolved spectroscopic measurements. Modelling indicates that enhanced re-erosion of deposited carbon layers is essential in explaining the amount of local deposition. Assuming negligible effective sticking of hydrocarbons, the measured local deposition of 20-34% is reproduced if re-erosion of deposits is enhanced by a factor of 2.5-7 compared to graphite erosion. If deposits are treated like the substrate, the modelled deposition is 55%. Deposition measurements at the shadowed area around injectors can be well explained by assuming negligible re-erosion but similar sticking behaviour there as on plasma-wetted surfaces.
Place, publisher, year, edition, pages
2009. Vol. T138, 014021- p.
SCRAPE-OFF LAYER, TRANSPORT, EROSION, CARBON
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-30361DOI: 10.1088/0031-8949/2009/T138/014021ISI: 000273199200022ScopusID: 2-s2.0-77953878595OAI: oai:DiVA.org:kth-30361DiVA: diva2:401527
QC 20110303 12th International Workshop on Plasma-Facing Materials and Components for Fusion Applications, Julich, GERMANY, MAY, 20092011-03-032011-02-242011-03-03Bibliographically approved