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Interaction of metal dust adhered on castellated substrates with the ELMy H-mode plasmas of ASDEX-Upgrade
KTH, School of Electrical Engineering and Computer Science (EECS), Space and Plasma Physics.
KTH, School of Electrical Engineering and Computer Science (EECS), Space and Plasma Physics.
CNR, Ist Fis Plasma, I-20125 Milan, Italy..
Max Planck Inst Plasma Phys, D-85748 Garching, Germany..
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2018 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 58, no 10, article id 106023Article in journal (Refereed) Published
Abstract [en]

Castellated substrates with adhered micron dust have been exposed in the outer ASDEX-Upgrade divertor to ELMy H-mode discharges. Beryllium proxy (chromium, copper) and refractory metal (tungsten, molybdenum) dust has been deposited on the plasma-facing and plasma-shadowed sides of the monoblocks as well as the bottom of the gaps. Interaction with time-averaged transient heat loads up to 5 MWm(-2) led to dust remobilization, clustering, melting and wetting-induced coagulation. The amount of dust released in the vessel has been quantified and remobilized dust trajectories inferred. Gaps can efficiently trap locally adhered dust, but dust detaching from adjacent monoblocks does not preferentially move inside the gaps implying that they do not constitute a dust accumulation site. Heat transfer simulations of melting events are also reported taking into account heat constriction due to the finite contact area and the presence of surface roughness.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2018. Vol. 58, no 10, article id 106023
Keywords [en]
metallic dust, transient heat loads, droplets, castellated PFC
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-233584DOI: 10.1088/1741-4326/aad471ISI: 000441678900001Scopus ID: 2-s2.0-85053430945OAI: oai:DiVA.org:kth-233584DiVA, id: diva2:1242397
Note

QC 20180828

Available from: 2018-08-28 Created: 2018-08-28 Last updated: 2018-10-16Bibliographically approved

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Ratynskaia, S.Tolias, P.Thorén, E.Vignitchouk, L.
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