Erosion at the inner wall of JET during the discharge campaigns 2001-2009

M. Mayer (Corresponding Author), S. Krat, J.P. Coad, Antti Hakola, Jari Likonen, S. Lindig, A. Widdowson, JET-EFDA collaborators

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    Abstract

    The erosion of Be, C, Ni and W marker layers was investigated with long-term samples exposed during the discharge periods 2001–2004 and 2005–2009. The markers were mounted in carbon wall tiles between the inner wall guard limiters (IWGLs) and at positions between the lower end of the IWGLs and the inner divertor entrance. They were analyzed using ion beam analysis techniques before and after exposure. All samples showed strong erosion of all elements. The erosion is predominantly due to neutral particles created by charge-exchange (CX) collisions. The erosion of carbon was about 8 × 1019 atoms/cm2 (about 8 μm) during the 2005–2009 campaign, which gives a total erosion of carbon from the recessed areas between the IWGLs of about 230 g: The inner wall is therefore an important net carbon source. The erosion of the four different elements allows a rough reconstruction of the energy spectrum of the eroding CX neutrals.
    Original languageEnglish
    Pages (from-to)S780-S783
    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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    Mayer, M., Krat, S., Coad, J. P., Hakola, A., Likonen, J., Lindig, S., Widdowson, A., & JET-EFDA collaborators (2013). Erosion at the inner wall of JET during the discharge campaigns 2001-2009. Journal of Nuclear Materials, 438(Supplement), S780-S783. https://doi.org/10.1016/j.jnucmat.2013.01.167