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Elastic-plastic adhesive impacts of tungsten dust with metal surfaces in plasma environments
KTH, School of Electrical Engineering (EES), Space and Plasma Physics. (Association EUROfusion-VR)ORCID iD: 0000-0002-6712-3625
KTH, School of Electrical Engineering (EES), Space and Plasma Physics. (Association EUROfusion-VR)ORCID iD: 0000-0001-9632-8104
KTH, School of Electrical Engineering (EES), Space and Plasma Physics. (Association EUROfusion-VR)ORCID iD: 0000-0001-7796-1887
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2015 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 463, 877-880 p.Article in journal (Refereed) Published
Abstract [en]

Dust-surface collisions impose size selectivity on the ability of dust grains to migrate in scrape-off layer and divertor plasmas and to adhere to plasma-facing components. Here, we report first experimental evidence of dust impact phenomena in plasma environments concerning low-speed collisions of tungsten dust with tungsten surfaces: re-bouncing, adhesion, sliding and rolling. The results comply with the predictions of the model of elastic-perfectly plastic adhesive spheres employed in the dust dynamics code MIGRAINe for sub- to several meters per second impacts of micrometer-range metal dust.

Place, publisher, year, edition, pages
2015. Vol. 463, 877-880 p.
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-172698DOI: 10.1016/j.jnucmat.2014.09.064ISI: 000358467200187ScopusID: 2-s2.0-84937636637OAI: diva2:850163

QC 20150901

Available from: 2015-09-01 Created: 2015-08-27 Last updated: 2016-05-25Bibliographically approved
In thesis
1. Modelling the multifaceted physics of metallic dust and droplets in fusion plasmas
Open this publication in new window or tab >>Modelling the multifaceted physics of metallic dust and droplets in fusion plasmas
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Plasma-material interaction constitutes one of the major scientific and technological issues affecting the development of thermonuclear fusion power plants. In particular, the release of metallic dust and droplets from plasmafacing components is a crucial aspect of reactor operation. By penetrating into the burning plasma, these micrometric particles act as a source of impurities which tend to radiate away the plasma energy, cooling it down below the threshold temperatures for sustainable fusion reactions. By accumulating in the reactor chamber, dust particles tend to retain fuel elements, lowering the reactor efficiency and increasing its radioactivity content. Dust accumulation also increases the risk of explosive hydrogen production upon accidental air or water ingress in the vacuum chamber. Numerical dust transport codes provide the essential framework to guide theoretical and experimental dust studies by simulating the intricate couplings between the many physical processes driving dust dynamics in fusion plasmas. This thesis reports on the development and validation of the MIGRAINe code, which specifically targets plasma-surface interaction processes and the physics of dust particles impinging on plasma-facing components to address long-term dust migration and accumulation in fusion devices.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. 80 p.
TRITA-EE, ISSN 1653-5146 ; 2016:084
National Category
Fusion, Plasma and Space Physics
Research subject
Electrical Engineering
urn:nbn:se:kth:diva-187638 (URN)978-91-7729-041-4 (ISBN)
Public defence
2016-06-13, E3, Osquars backe 14, Stockholm, 13:30 (English)

QC 20160525

Available from: 2016-05-25 Created: 2016-05-25 Last updated: 2016-05-26Bibliographically approved

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Ratynskaia, SvetlanaTolias, PanagiotisVignitchouk, Ladislas Tancrède RaymondBykov, Igor
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