Induced carbon deposition by local hydrocarbon injection into detached divertor plasmas in JET

Markus Airila (Corresponding Author), J.P. Coad, JET-EFDA collaborators, S. Brezinsek, P. Belo, M. Groth, A. Kirschner, T. Makkonen, M.F. Stamp, J.D. Strachan, A.M. Widdowson, S. Wiesen

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    1 Citation (Scopus)

    Abstract

    During detachment experiments of JET in 2007 (Brezinsek et al., 2009 [1]), 1 × 1022 molecules of 12CD4 were injected at a rate of about 5 × 1020 s−1 into L-mode plasma. The injection was done at the outer strike point in the centre of the horizontal target, just before opening the machine. The deposited layers were analyzed for deuterium post mortem after the removal of tiles. The heaviest local D deposition density is found immediately upstream of the gas inlet, but downstream the deposition is found over a larger area. In total, 3.7 × 1020 deuterium atoms were found locally deposited; if the mean D/C in the deposits is 0.4, then about 10% of the injected carbon was locally deposited. Transport and local deposition of the injected carbon was modeled with the 3D Monte Carlo impurity transport code ERO (Kirschner et al., 2000 [2]). The plasma background was generated with the onion-skin solver of the DIVIMP code (Stangeby and Elder, 1992 [3]). Locally deposited fraction is reproduced with ERO but the distribution not satisfactorily. In particular the poloidal transport of carbon is several times weaker than measured.
    Original languageEnglish
    Pages (from-to)S235-S238
    Number of pages4
    JournalJournal of Nuclear Materials
    Volume415
    Issue number1
    DOIs
    Publication statusPublished - 2011
    MoE publication typeA1 Journal article-refereed
    Event19th International Conference on Plasma Surface Interactions in Controlled Fusion Devices, PSI-19 - San Diego, United States
    Duration: 24 May 201028 May 2010

    Keywords

    • plasma physics
    • Monte Carlo code
    • divertors

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