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Normal high velocity solid dust impacts on tiles of tokamak-relevant temperature
Institute for Plasma Science and Technology - CNR, via Cozzi 53, 20125 Milano, Italy, via Cozzi 53.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Space and Plasma Physics.ORCID iD: 0000-0001-9632-8104
First Light Fusion, Unit 10, Oxford Pioneer Park, Mead Road, Yarnton, Kidlington, Oxford, OX5 1QU, UK, Unit 10, Oxford Pioneer Park, Mead Road, Yarnton, Kidlington.
Institute of Condensed Matter Chemistry and Energy Technologies - CNR, via Cozzi 53, 20125 Milano, Italy, via Cozzi 53.
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2024 (English)In: Nuclear Materials and Energy, E-ISSN 2352-1791, Vol. 41, article id 101735Article in journal (Refereed) Published
Abstract [en]

Runaway electron incidence on plasma facing components triggers explosive events that are accompanied by the expulsion of fast solid debris. Subsequent dust-wall high speed impacts constitute a mechanism of wall damage and dust destruction. Empirical damage laws that can be employed for erosion estimates are based on room-temperature impact experiments. We use light-gas gun shooting systems to accelerate solid tungsten dust to near-supersonic speeds towards bulk tungsten targets that are maintained at different temperatures. This concerns targets cooled down to −100°C with liquid nitrogen and targets resistively heated up to 400 °C. Post-mortem surface analysis reveals that the three erosion regimes (plastic deformation, bonding, partial disintegration) weakly depend on the target temperature within the investigated range. It is concluded that empirical damage laws based on room-temperature measurements can be safely employed for predictions.

Place, publisher, year, edition, pages
Elsevier Ltd , 2024. Vol. 41, article id 101735
Keywords [en]
Damage laws, Dust in tokamaks, Mechanical impacts, Runaway electron impact, Wall cratering
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-353922DOI: 10.1016/j.nme.2024.101735ISI: 001318353600001Scopus ID: 2-s2.0-85203871276OAI: oai:DiVA.org:kth-353922DiVA, id: diva2:1900997
Note

QC 20240927

Available from: 2024-09-25 Created: 2024-09-25 Last updated: 2024-10-08Bibliographically approved

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Tolias, Panagiotis

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