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

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

doi:10.1088/0031-8949/2014/T159/014027

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

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

21 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 language	English
Article number	014027
Number of pages	5
Journal	Physica Scripta
Issue number	T159
DOIs	https://doi.org/10.1088/0031-8949/2014/T159/014027
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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10.1088/0031-8949/2014/T159/014027

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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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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

SN - 0031-8949

JO - Physica Scripta

JF - Physica Scripta

IS - T159

M1 - 014027

T2 - 14th International conference on plasma-facing materials and components for fusion applications

Y2 - 13 May 2013 through 17 May 2013

ER -

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

Abstract

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