ERO modelling of local deposition of injected C-13 tracer at the outer divertor of JET

QC 20110303 12th International Workshop on Plasma-Facing Materials and Components for Fusion Applications, Julich, GERMANY, MAY, 2009
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.

Aho-Mantila, L. (författare)
Brezinsek, S. (författare)
Coad, J. P. (författare)
Kirschner, A. (författare)
Likonen, J. (författare)
Matveev, D. (författare)
Rubel, MarekKTH,Alfvénlaboratoriet,Fusionsplasmafysik(Swepub:kth)u1vrej8y (författare)
Strachan, J. D. (författare)
Widdowson, A. (författare)
Wiesen, S. (författare)
KTHAlfvénlaboratoriet (creator_code:org_t)

Av författaren/redakt...: Airila, M. I.; Aho-Mantila, L.; Brezinsek, S.; Coad, J. P.; Kirschner, A.; Likonen, J.; visa fler...; Matveev, D.; Rubel, Marek; Strachan, J. D.; Widdowson, A.; Wiesen, S.; visa färre...

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