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.
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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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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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