Overview of material re-deposition and fuel retention studies at JET with the Gas Box divertor

J.P. Coad, Jari Likonen, M. Rubel, Elizaveta Vainonen-Ahlgren, D.E. Hole, T. Sajavaara, Tommi Renvall, G.F. Matthews, JET-EFDA Contributors

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    78 Citations (Scopus)

    Abstract

    In the period 1998—2001 the JET tokamak was operated with the MkII Gas Box divertor. On two occasions during that period a number of limiter and divertor tiles were retrieved from the torus and then examined ex situ with surface sensitive techniques. Erosion and deposition patterns were determined in order to assess the material erosion, material migration and fuel inventory on plasma facing components. Tracer techniques, e.g. injection of 13C labelled methane and tiles coated with a low-Z and high-Z marker layer, were used to enhance the volume of information on the material transport. The results show significant asymmetry in the distribution of fuel and plasma impurity species between the inner (net deposition area) and the outer (net erosion) divertor channels. No significant formation of highly hydrogenated carbon films has been found in the Gas Box structure. The important processes for material migration, and the influence of operation scenarios on the morphology of the deposits are discussed. Comparison is also made with results obtained following previous divertor campaigns.
    Original languageEnglish
    Pages (from-to)350-366
    Number of pages17
    JournalNuclear Fusion
    Volume46
    Issue number2
    DOIs
    Publication statusPublished - 2006
    MoE publication typeA1 Journal article-refereed

    Keywords

    • JET
    • plasma
    • fusion energy
    • fusion reactors
    • ITER
    • Tokamak
    • divertor
    • divertor plasma

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  • Cite this

    Coad, J. P., Likonen, J., Rubel, M., Vainonen-Ahlgren, E., Hole, D. E., Sajavaara, T., Renvall, T., Matthews, G. F., & JET-EFDA Contributors (2006). Overview of material re-deposition and fuel retention studies at JET with the Gas Box divertor. Nuclear Fusion, 46(2), 350-366. https://doi.org/10.1088/0029-5515/46/2/018