Long-term erosion of plasma-facing materials with different surface roughness in ASDEX Upgrade

Antti Hakola (Corresponding Author), Juuso Karhunen, Seppo Koivuranta, Jari Likonen, M. Balden, A. Herrmann, M. Mayer, H.W. Müller, R. Neu, V. Rohde, K. Sugiyama, ASDEX Upgrade Team

    Research output: Contribution to journalArticleScientificpeer-review

    6 Citations (Scopus)

    Abstract

    The effect of surface roughness on the long-term erosion patterns of tungsten coatings was investigated in the outer strike-point region of ASDEX Upgrade during its 2010–11 plasma operations. The net erosion rates of rough coatings (Ra = 5–6 μm) were three to seven times smaller than those of smooth coatings (Ra = 0.4–0.8 μm). This is because rough surfaces are largely modified and damaged in the microscopic scale but the material is re-deposited together with boron, deuterium and carbon on the shadowed sides of the most prominent surface features. In addition, we observed that W coatings were eroded on average at a rate of 0.03 nm s−1, which was three to four times smaller than the value for Cr, simulating here steel.
    Original languageEnglish
    Article number014027
    Number of pages5
    JournalPhysica Scripta
    Issue numberT159
    DOIs
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed
    Event14th International conference on plasma-facing materials and components for fusion applications: PFMC-14 - Jülich, Germany
    Duration: 13 May 201317 May 2013

    Fingerprint

    Erosion
    Surface Roughness
    Coating
    erosion
    surface roughness
    Plasma
    coatings
    Rough Surface
    Rough
    deuterium
    Steel
    Carbon
    tungsten
    boron
    steels
    carbon

    Cite this

    Hakola, Antti ; Karhunen, Juuso ; Koivuranta, Seppo ; Likonen, Jari ; Balden, M. ; Herrmann, A. ; Mayer, M. ; Müller, H.W. ; Neu, R. ; Rohde, V. ; Sugiyama, K. ; ASDEX Upgrade Team. / Long-term erosion of plasma-facing materials with different surface roughness in ASDEX Upgrade. In: Physica Scripta. 2014 ; No. T159.
    @article{12990e8e710a4809a1fbb6f1bd666c78,
    title = "Long-term erosion of plasma-facing materials with different surface roughness in ASDEX Upgrade",
    abstract = "The effect of surface roughness on the long-term erosion patterns of tungsten coatings was investigated in the outer strike-point region of ASDEX Upgrade during its 2010–11 plasma operations. The net erosion rates of rough coatings (Ra = 5–6 μm) were three to seven times smaller than those of smooth coatings (Ra = 0.4–0.8 μm). This is because rough surfaces are largely modified and damaged in the microscopic scale but the material is re-deposited together with boron, deuterium and carbon on the shadowed sides of the most prominent surface features. In addition, we observed that W coatings were eroded on average at a rate of 0.03 nm s−1, which was three to four times smaller than the value for Cr, simulating here steel.",
    author = "Antti Hakola and Juuso Karhunen and Seppo Koivuranta and Jari Likonen and M. Balden and A. Herrmann and M. Mayer and H.W. M{\"u}ller and R. Neu and V. Rohde and K. Sugiyama and {ASDEX Upgrade Team}",
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    year = "2014",
    doi = "10.1088/0031-8949/2014/T159/014027",
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    Hakola, A, Karhunen, J, Koivuranta, S, Likonen, J, Balden, M, Herrmann, A, Mayer, M, Müller, HW, Neu, R, Rohde, V, Sugiyama, K & ASDEX Upgrade Team 2014, 'Long-term erosion of plasma-facing materials with different surface roughness in ASDEX Upgrade', Physica Scripta, no. T159, 014027. https://doi.org/10.1088/0031-8949/2014/T159/014027

    Long-term erosion of plasma-facing materials with different surface roughness in ASDEX Upgrade. / Hakola, Antti (Corresponding Author); Karhunen, Juuso; Koivuranta, Seppo; Likonen, Jari; Balden, M.; Herrmann, A.; Mayer, M.; Müller, H.W.; Neu, R.; Rohde, V.; Sugiyama, K.; ASDEX Upgrade Team.

    In: Physica Scripta, No. T159, 014027, 2014.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Long-term erosion of plasma-facing materials with different surface roughness in ASDEX Upgrade

    AU - Hakola, Antti

    AU - Karhunen, Juuso

    AU - Koivuranta, Seppo

    AU - Likonen, Jari

    AU - Balden, M.

    AU - Herrmann, A.

    AU - Mayer, M.

    AU - Müller, H.W.

    AU - Neu, R.

    AU - Rohde, V.

    AU - Sugiyama, K.

    AU - ASDEX Upgrade Team

    N1 - Project code: 85724

    PY - 2014

    Y1 - 2014

    N2 - The effect of surface roughness on the long-term erosion patterns of tungsten coatings was investigated in the outer strike-point region of ASDEX Upgrade during its 2010–11 plasma operations. The net erosion rates of rough coatings (Ra = 5–6 μm) were three to seven times smaller than those of smooth coatings (Ra = 0.4–0.8 μm). This is because rough surfaces are largely modified and damaged in the microscopic scale but the material is re-deposited together with boron, deuterium and carbon on the shadowed sides of the most prominent surface features. In addition, we observed that W coatings were eroded on average at a rate of 0.03 nm s−1, which was three to four times smaller than the value for Cr, simulating here steel.

    AB - The effect of surface roughness on the long-term erosion patterns of tungsten coatings was investigated in the outer strike-point region of ASDEX Upgrade during its 2010–11 plasma operations. The net erosion rates of rough coatings (Ra = 5–6 μm) were three to seven times smaller than those of smooth coatings (Ra = 0.4–0.8 μm). This is because rough surfaces are largely modified and damaged in the microscopic scale but the material is re-deposited together with boron, deuterium and carbon on the shadowed sides of the most prominent surface features. In addition, we observed that W coatings were eroded on average at a rate of 0.03 nm s−1, which was three to four times smaller than the value for Cr, simulating here steel.

    U2 - 10.1088/0031-8949/2014/T159/014027

    DO - 10.1088/0031-8949/2014/T159/014027

    M3 - Article

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