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Interaction of adhered metallic dust with transient plasma heat loads
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: 0000-0001-9632-8104
Vise andre og tillknytning
2016 (engelsk)Inngår i: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 56, artikkel-id 066010Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The first study of the interaction of metallic dust (tungsten, aluminum) adhered on tungsten substrates with transient plasma heat loads is presented. Experiments were carried out in the Pilot-PSI linear device with transient heat fluxes up to 550 MW m(-2) and in the DIII-D divertor tokamak. The central role of the dust-substrate contact area in heat conduction is highlighted and confirmed by heat transfer simulations. The experiments provide evidence of the occurrence of wetting-induced coagulation, a novel growth mechanism where cluster melting accompanied by droplet wetting leads to the formation of larger grains. The physical processes behind this mechanism are elucidated. The remobilization activity of the newly formed dust and the survivability of tungsten dust on hot surfaces are documented and discussed in the light of implications for ITER.

sted, utgiver, år, opplag, sider
Institute of Physics Publishing (IOPP), 2016. Vol. 56, artikkel-id 066010
Emneord [en]
metallic dust, transient heat, dust remobilization, droplets
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-187635DOI: 10.1088/0029-5515/56/6/066010ISI: 000376446000014Scopus ID: 2-s2.0-84975476301OAI: oai:DiVA.org:kth-187635DiVA, id: diva2:930791
Merknad

QC 20160620

Tilgjengelig fra: 2016-05-25 Laget: 2016-05-25 Sist oppdatert: 2017-06-08bibliografisk kontrollert
Inngår i avhandling
1. Modelling the multifaceted physics of metallic dust and droplets in fusion plasmas
Åpne denne publikasjonen i ny fane eller vindu >>Modelling the multifaceted physics of metallic dust and droplets in fusion plasmas
2016 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
KTH Royal Institute of Technology, 2016. s. 80
Serie
TRITA-EE, ISSN 1653-5146 ; 2016:084
HSV kategori
Forskningsprogram
Elektro- och systemteknik
Identifikatorer
urn:nbn:se:kth:diva-187638 (URN)978-91-7729-041-4 (ISBN)
Disputas
2016-06-13, E3, Osquars backe 14, Stockholm, 13:30 (engelsk)
Opponent
Veileder
Merknad

QC 20160525

Tilgjengelig fra: 2016-05-25 Laget: 2016-05-25 Sist oppdatert: 2016-05-26bibliografisk kontrollert

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