Arc behaviour on different materials in ASDEX Upgrade
Arcs, a source of dust particles and a localized erosion mechanism of the plasma-facing components, are found in all major fusion plasma devices. Measurements of arcs require diagnostics with high temporal and local resolution, which are not available at arc dominated locations in ASDEX Upgrade (AUG...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-12-01
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| Series: | Nuclear Materials and Energy |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179121001496 |
| _version_ | 1818352728339906560 |
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| author | V. Rohde M. Balden R. Neu |
| author_facet | V. Rohde M. Balden R. Neu |
| author_sort | V. Rohde |
| collection | DOAJ |
| description | Arcs, a source of dust particles and a localized erosion mechanism of the plasma-facing components, are found in all major fusion plasma devices. Measurements of arcs require diagnostics with high temporal and local resolution, which are not available at arc dominated locations in ASDEX Upgrade (AUG). To understand the erosion by arcing and to allow extrapolation for future fusion devices different materials are used to scan the material properties. In AUG, inserts were installed at the inner baffle region to measure the erosion by arcing. The use of polished inserts allows an accurate determination of the arc traces by depth maps obtained by laser profilometery. It turned out that the melting temperature of the materials is the main parameter for erosion. For tungsten mounted at the inner baffle, a region which is deposition dominated, an erosion rate by arcing of 1.2·1013 at cm−2 s−1 is measured. For Beryllium, 9.5·1013 at cm−2 s−1 is extrapolated from its thermal properties. As martensitic–ferritic low-activation steel is under discussion for the use in DEMO, magnetic steels were also investigated. Comparing stainless steel with magnetic steel, much deeper and wider craters are found in the latter one: they reach a depth of −80 μm. The erosion of magnetic steel by arcs is 40 times higher compared to stainless steel, which has almost the same physical properties. |
| first_indexed | 2024-12-13T18:58:15Z |
| format | Article |
| id | doaj.art-010f14364d2749b983faa067f56065c2 |
| institution | Directory Open Access Journal |
| issn | 2352-1791 |
| language | English |
| last_indexed | 2024-12-13T18:58:15Z |
| publishDate | 2021-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Materials and Energy |
| spelling | doaj.art-010f14364d2749b983faa067f56065c22022-12-21T23:34:45ZengElsevierNuclear Materials and Energy2352-17912021-12-0129101083Arc behaviour on different materials in ASDEX UpgradeV. Rohde0M. Balden1R. Neu2Corresponding author.; Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, GermanyMax Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, GermanyMax Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, GermanyArcs, a source of dust particles and a localized erosion mechanism of the plasma-facing components, are found in all major fusion plasma devices. Measurements of arcs require diagnostics with high temporal and local resolution, which are not available at arc dominated locations in ASDEX Upgrade (AUG). To understand the erosion by arcing and to allow extrapolation for future fusion devices different materials are used to scan the material properties. In AUG, inserts were installed at the inner baffle region to measure the erosion by arcing. The use of polished inserts allows an accurate determination of the arc traces by depth maps obtained by laser profilometery. It turned out that the melting temperature of the materials is the main parameter for erosion. For tungsten mounted at the inner baffle, a region which is deposition dominated, an erosion rate by arcing of 1.2·1013 at cm−2 s−1 is measured. For Beryllium, 9.5·1013 at cm−2 s−1 is extrapolated from its thermal properties. As martensitic–ferritic low-activation steel is under discussion for the use in DEMO, magnetic steels were also investigated. Comparing stainless steel with magnetic steel, much deeper and wider craters are found in the latter one: they reach a depth of −80 μm. The erosion of magnetic steel by arcs is 40 times higher compared to stainless steel, which has almost the same physical properties.http://www.sciencedirect.com/science/article/pii/S2352179121001496TokamakASDEX upgradeArcingPlasma wall interactionDust |
| spellingShingle | V. Rohde M. Balden R. Neu Arc behaviour on different materials in ASDEX Upgrade Nuclear Materials and Energy Tokamak ASDEX upgrade Arcing Plasma wall interaction Dust |
| title | Arc behaviour on different materials in ASDEX Upgrade |
| title_full | Arc behaviour on different materials in ASDEX Upgrade |
| title_fullStr | Arc behaviour on different materials in ASDEX Upgrade |
| title_full_unstemmed | Arc behaviour on different materials in ASDEX Upgrade |
| title_short | Arc behaviour on different materials in ASDEX Upgrade |
| title_sort | arc behaviour on different materials in asdex upgrade |
| topic | Tokamak ASDEX upgrade Arcing Plasma wall interaction Dust |
| url | http://www.sciencedirect.com/science/article/pii/S2352179121001496 |
| work_keys_str_mv | AT vrohde arcbehaviourondifferentmaterialsinasdexupgrade AT mbalden arcbehaviourondifferentmaterialsinasdexupgrade AT rneu arcbehaviourondifferentmaterialsinasdexupgrade |