Material migration patterns and overview of first surface analysis of the JET ITER-like wall

A A Widdowson (Corresponding Author), E. Alves, C.F. Ayres, A. Baron-Wiechec, S. Brezinsek, N. Catarino, J.P. Coad, K. Heinola, Jari Likonen, G.F. Matthews, M. Rubel, JET-EFDA contributors

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    Abstract

    Following the first JET ITER-like wall operations a detailed in situ photographic survey of the main chamber and divertor was completed. In addition, a selection of tiles and passive diagnostics were removed from the vessel and made available for post mortem analysis. From the photographic survey and results from initial analysis, the first conclusions regarding erosion, deposition, fuel retention and material transport during divertor and limiter phases have been drawn. The rate of deposition on inner and outer base divertor tiles and remote divertor corners was more than an order of magnitude less than during the preceding carbon wall operations, as was the concomitant deuterium retention. There was however beryllium deposition at the top of the inner divertor. The net beryllium erosion rate from the mid-plane inner limiters was found to be higher than for the previous carbon wall campaign although further analysis is required to determine the overall material balance due to erosion and re-deposition.
    Original languageEnglish
    Article number014010
    Number of pages9
    JournalPhysica Scripta
    Volume2014
    Issue numberT159
    DOIs
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed

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    A Widdowson, A., Alves, E., Ayres, C. F., Baron-Wiechec, A., Brezinsek, S., Catarino, N., Coad, J. P., Heinola, K., Likonen, J., Matthews, G. F., Rubel, M., & contributors, JET-EFDA. (2014). Material migration patterns and overview of first surface analysis of the JET ITER-like wall. Physica Scripta, 2014(T159), [014010]. https://doi.org/10.1088/0031-8949/2014/T159/014010