Global migration of 13C impurities in high-density L-mode plasmas in ASDEX Upgrade

Antti Hakola (Corresponding Author), Seppo Koivuranta, Jari Likonen, M. Groth, T. Kurki-Suonio, V. Lindholm, J. Miettunen, K. Krieger, M. Mayer, H.W. Müller, R. Neu, V. Rohde, P. Petersson, ASDEX Upgrade Team

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    Abstract

    We have studied the migration of 13C in ASDEX Upgrade after a global impurity injection experiment in 2011. The main chamber was observed to be the largest deposition region for carbon: almost 35% of the injected atoms end up there. Moreover, gaps between wall tiles account for surface densities which are comparable to those on the plasma-facing surfaces. SOLPS modeling of the experiment produced a set of background plasmas and poloidal flow profiles for simulating the transport of 13C with ASCOT; a match with measured deposition, however, required using an imposed flow profile. ASCOT reproduced the observed localized deposition at the outer midplane but work is needed to explain the measured deposition at the inner side of the torus and at the top of the vessel.
    Original languageEnglish
    Pages (from-to)S694-S697
    Number of pages4
    JournalJournal of Nuclear Materials
    Volume438
    Issue numberSupplement
    DOIs
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed
    Event20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices - Aachen, Aachen, Germany
    Duration: 21 May 201225 May 2012

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    Hakola, A., Koivuranta, S., Likonen, J., Groth, M., Kurki-Suonio, T., Lindholm, V., Miettunen, J., Krieger, K., Mayer, M., Müller, H. W., Neu, R., Rohde, V., Petersson, P., & ASDEX Upgrade Team (2013). Global migration of 13C impurities in high-density L-mode plasmas in ASDEX Upgrade. Journal of Nuclear Materials, 438(Supplement), S694-S697. https://doi.org/10.1016/j.jnucmat.2013.01.147