Modelling of carbon migration during JET 13C injection experiments

J. D. Strachan, Jari Likonen, P. Coad, M. Rubel, A. Widdowson, M. Airila, P. Andrew, S. Brezinsek, G. Corrigan, H. G. Esser, S. Jachmich, A. Kallenbach, A. Kirschner, A. Kreter, G. F. Matthews, V. Philipps, R. A. Pitts, J. Spence, M. Stamp, S. WiesenJET-EFDA Contributors

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    Abstract

    JET has performed two dedicated carbon migration experiments on the final run day of separate campaigns (2001 and 2004) using 13CH4 methane injected into repeated discharges. The EDGE2D/NIMBUS code modelled the carbon migration in both experiments. This paper describes this modelling and identifies a number of important migration pathways: (1) deposition and erosion near the injection location, (2) migration through the main chamber SOL, (3) migration through the private flux region (PFR) aided by E × B drifts and (4) neutral migration originating near the strike points. In H-Mode, type I ELMs are calculated to influence the migration by enhancing erosion during the ELM peak and increasing the long-range migration immediately following the ELM. The erosion/re-deposition cycle along the outer target leads to a multistep migration of 13C towards the separatrix which is called 'walking'. This walking created carbon neutrals at the outer strike point and led to 13C deposition in the PFR. Although several migration pathways have been identified, quantitative analyses are hindered by experimental uncertainty in divertor leakage, and the lack of measurements at locations such as gaps and shadowed regions.
    Original languageEnglish
    Article number105002
    JournalNuclear Fusion
    Volume48
    Issue number10
    DOIs
    Publication statusPublished - 2008
    MoE publication typeA1 Journal article-refereed

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    Strachan, J. D., Likonen, J., Coad, P., Rubel, M., Widdowson, A., Airila, M., Andrew, P., Brezinsek, S., Corrigan, G., Esser, H. G., Jachmich, S., Kallenbach, A., Kirschner, A., Kreter, A., Matthews, G. F., Philipps, V., Pitts, R. A., Spence, J., Stamp, M., ... JET-EFDA Contributors (2008). Modelling of carbon migration during JET 13C injection experiments. Nuclear Fusion, 48(10), [105002]. https://doi.org/10.1088/0029-5515/48/10/105002