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

Markus, I. Airila, L.K. Aho-Mantila, S. Brezinsek, J.P. Coad, A. Kirschner, Jari Likonen, D. Matveev, M. Rubel, J.D. Strachan, A. Widdowson, S. Wiesen, JET EFDA Contributors

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    Abstract

    The 2004 tracer experiment of JET with the injection of 13CH4 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.
    Original languageEnglish
    Article number014021
    JournalPhysica Scripta
    Issue numberT138
    DOIs
    Publication statusPublished - 2009
    MoE publication typeA1 Journal article-refereed

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    Airila, M. I., Aho-Mantila, L. K., Brezinsek, S., Coad, J. P., Kirschner, A., Likonen, J., Matveev, D., Rubel, M., Strachan, J. D., Widdowson, A., Wiesen, S., & Contributors, JET. EFDA. (2009). ERO modelling of local deposition of injected 13C tracer at the outer divertor of JET. Physica Scripta, (T138), [014021]. https://doi.org/10.1088/0031-8949/2009/T138/014021