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, Antti Hakola, T. Höschen, Jari Likonen, D. Nishijima, H.H. Toudeshki

    Research output: Contribution to journalArticleScientificpeer-review

    18 Citations (Scopus)


    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
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed


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