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

    Research output: Contribution to journalArticleScientificpeer-review

    16 Citations (Scopus)

    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

    Fingerprint

    transient heating
    Tungsten
    Ablation
    ablation
    tungsten
    Heating
    Laser heating
    laser heating
    heat of formation
    inoculation
    Pulsed lasers
    pulsed lasers
    Activation energy
    Chemical activation
    activation
    Ions
    activation energy
    Plasmas
    thresholds
    energy

    Cite this

    Yu, J. H., Baldwin, M. J., Doerner, R. P., Dittmar, T., Hakola, A., Höschen, T., ... 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
    Yu, J.H. ; Baldwin, M.J. ; Doerner, R.P. ; Dittmar, T. ; Hakola, A. ; Höschen, T. ; Likonen, J. ; Nishijima, D. ; Toudeshki, H.H. / Transient heating effects on tungsten: Ablation of Be layers and enhanced fuzz growth. In: Journal of Nuclear Materials. 2015 ; Vol. 463. pp. 299-302.
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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.",
    author = "J.H. Yu and M.J. Baldwin and R.P. Doerner and T. Dittmar and A. Hakola and T. H{\"o}schen and J. Likonen and D. Nishijima and H.H. Toudeshki",
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    Yu, JH, Baldwin, MJ, Doerner, RP, Dittmar, T, Hakola, A, Höschen, T, Likonen, J, Nishijima, D & Toudeshki, HH 2015, 'Transient heating effects on tungsten: Ablation of Be layers and enhanced fuzz growth', Journal of Nuclear Materials, vol. 463, pp. 299-302. https://doi.org/10.1016/j.jnucmat.2014.10.035

    Transient heating effects on tungsten: Ablation of Be layers and enhanced fuzz growth. / Yu, J.H. (Corresponding Author); Baldwin, M.J.; Doerner, R.P.; Dittmar, T.; Hakola, A.; Höschen, T.; Likonen, J.; Nishijima, D.; Toudeshki, H.H.

    In: Journal of Nuclear Materials, Vol. 463, 2015, p. 299-302.

    Research output: Contribution to journalArticleScientificpeer-review

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    T1 - Transient heating effects on tungsten: Ablation of Be layers and enhanced fuzz growth

    AU - Yu, J.H.

    AU - Baldwin, M.J.

    AU - Doerner, R.P.

    AU - Dittmar, T.

    AU - Hakola, A.

    AU - Höschen, T.

    AU - Likonen, J.

    AU - Nishijima, D.

    AU - Toudeshki, H.H.

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    AB - 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.

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