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Migration of tungsten dust in tokamaks: role of dust-wall collisions
KTH, Skolan för elektro- och systemteknik (EES), Rymd- och plasmafysik.ORCID-id: 0000-0002-6712-3625
KTH, Skolan för elektro- och systemteknik (EES), Rymd- och plasmafysik.ORCID-id: 0000-0001-7796-1887
KTH, Skolan för elektro- och systemteknik (EES), Rymd- och plasmafysik.ORCID-id: 0000-0001-9632-8104
KTH, Skolan för elektro- och systemteknik (EES), Fusionsplasmafysik.
Visa övriga samt affilieringar
2013 (Engelska)Ingår i: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 53, nr 12, s. 123002-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The modelling of a controlled tungsten dust injection experiment in TEXTOR by the dust dynamics code MIGRAINe is reported. The code, in addition to the standard dust-plasma interaction processes, also encompasses major mechanical aspects of dust-surface collisions. The use of analytical expressions for the restitution coefficients as functions of the dust radius and impact velocity allows us to account for the sticking and rebound phenomena that define which parts of the dust size distribution can migrate efficiently. The experiment provided unambiguous evidence of long-distance dust migration; artificially introduced tungsten dust particles were collected 120 degrees toroidally away from the injection point, but also a selectivity in the permissible size of transported grains was observed. The main experimental results are reproduced by modelling.

Ort, förlag, år, upplaga, sidor
2013. Vol. 53, nr 12, s. 123002-
Nyckelord [en]
Surface-Roughness, Theoretical-Model, Plastic Spheres, Oblique Impacts, Elastic Solids, Contact, Restitution, Adhesion, Textor, Coefficient
Nationell ämneskategori
Fysik
Identifikatorer
URN: urn:nbn:se:kth:diva-140162DOI: 10.1088/0029-5515/53/12/123002ISI: 000327787000004Scopus ID: 2-s2.0-84889008281OAI: oai:DiVA.org:kth-140162DiVA, id: diva2:689503
Forskningsfinansiär
Vetenskapsrådet
Anmärkning

QC 20140121

Tillgänglig från: 2014-01-21 Skapad: 2014-01-17 Senast uppdaterad: 2017-12-06Bibliografiskt granskad
Ingår i avhandling
1. Modelling the multifaceted physics of metallic dust and droplets in fusion plasmas
Öppna denna publikation i ny flik eller fönster >>Modelling the multifaceted physics of metallic dust and droplets in fusion plasmas
2016 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
KTH Royal Institute of Technology, 2016. s. 80
Serie
TRITA-EE, ISSN 1653-5146 ; 2016:084
Nationell ämneskategori
Fusion, plasma och rymdfysik
Forskningsämne
Elektro- och systemteknik
Identifikatorer
urn:nbn:se:kth:diva-187638 (URN)978-91-7729-041-4 (ISBN)
Disputation
2016-06-13, E3, Osquars backe 14, Stockholm, 13:30 (Engelska)
Opponent
Handledare
Anmärkning

QC 20160525

Tillgänglig från: 2016-05-25 Skapad: 2016-05-25 Senast uppdaterad: 2016-05-26Bibliografiskt granskad

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Ratynskaia, SvetlanaVignitchouk, LadislasTolias, Panagiotis

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Ratynskaia, SvetlanaVignitchouk, LadislasTolias, PanagiotisBykov, IgorBergsåker, Henric
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