Migration of tungsten dust in tokamaks: role of dust-wall collisions
2013 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 53, no 12, 123002- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2013. Vol. 53, no 12, 123002- p.
Surface-Roughness, Theoretical-Model, Plastic Spheres, Oblique Impacts, Elastic Solids, Contact, Restitution, Adhesion, Textor, Coefficient
IdentifiersURN: urn:nbn:se:kth:diva-140162DOI: 10.1088/0029-5515/53/12/123002ISI: 000327787000004ScopusID: 2-s2.0-84889008281OAI: oai:DiVA.org:kth-140162DiVA: diva2:689503
FunderSwedish Research Council
QC 201401212014-01-212014-01-172016-05-25Bibliographically approved