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Fast camera observations of injected and intrinsic dust in TEXTOR
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0001-7796-1887
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2015 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 57, no 12, 125017Article in journal (Refereed) PublishedText
Abstract [en]

Stereoscopic fast camera observations of pre-characterized carbon and tungsten dust injection in TEXTOR are reported, along with the modelling of tungsten particle trajectories with MIGRAINe. Particle tracking analysis of the video data showed significant differences in dust dynamics: while carbon flakes were prone to agglomeration and explosive destruction, spherical tungsten particles followed quasi-inertial trajectories. Although this inertial nature prevented any validation of the force models used in MIGRAINe, comparisons between the experimental and simulated lifetimes provide a direct evidence of dust temperature overestimation in dust dynamics codes. Furthermore, wide-view observations of the TEXTOR interior revealed the main production mechanism of intrinsic carbon dust, as well as the location of probable dust remobilization sites.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2015. Vol. 57, no 12, 125017
Keyword [en]
dust, fast camera, TRACE, MIGRAINe, TEXTOR
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-185679DOI: 10.1088/0741-3335/57/12/125017ISI: 000373345000020OAI: oai:DiVA.org:kth-185679DiVA: diva2:923023
Note

QC 20160425

Available from: 2016-04-25 Created: 2016-04-25 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.
Series
TRITA-EE, ISSN 1653-5146 ; 2016:084
National Category
Fusion, Plasma and Space Physics
Research subject
Electrical Engineering
Identifiers
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)
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Supervisors
Note

QC 20160525

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

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