Abstract
| Original language | English |
|---|---|
| Article number | 014027 |
| Number of pages | 5 |
| Journal | Physica Scripta |
| Issue number | T159 |
| DOIs | |
| Publication status | Published - 2014 |
| MoE publication type | A1 Journal article-refereed |
| Event | 14th International conference on plasma-facing materials and components for fusion applications: PFMC-14 - Jülich, Germany Duration: 13 May 2013 → 17 May 2013 |
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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 journal › Article › Scientific › peer-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
JO - Physica Scripta
JF - Physica Scripta
SN - 0031-8949
IS - T159
M1 - 014027
ER -