Transient heating effects on tungsten: Ablation of Be layers and enhanced fuzz growth

J.H. Yu (Corresponding Author), M.J. Baldwin, R.P. Doerner, T. Dittmar, A. Hakola, T. Höschen, J. Likonen, D. Nishijima, H.H. Toudeshki

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    Abstract

    A pulsed laser in the PISCES-B facility is used to simulate transient heating events such as ELMs and disruptions on W. The first study of enhanced nano-scale W tendril growth (''fuzz'') due to cyclic fast transient heating of W exposed to low energy (EHe+ 30 eV) He+ ions is presented. Fuzz due to transient heating is up to 10 thicker than the steady state fuzz thickness with no laser heating. A general thermal activation model yields higher values for the activation energy and pre-exponential factor than previously reported in steady state experiments with EHe+ 60 eV. Transient heating of W exposed to D plasma with Be seeding shows that the removal threshold of Be follows simple energy considerations based on the heat of formation of Be.
    Original languageEnglish
    Pages (from-to)299-302
    JournalJournal of Nuclear Materials
    Volume463
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed

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    Yu, J. H., Baldwin, M. J., Doerner, R. P., Dittmar, T., Hakola, A., Höschen, T., Likonen, J., Nishijima, D., & Toudeshki, H. H. (2015). Transient heating effects on tungsten: Ablation of Be layers and enhanced fuzz growth. Journal of Nuclear Materials, 463, 299-302. https://doi.org/10.1016/j.jnucmat.2014.10.035