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2013, Articolo in rivista, ENG

Migration of tungsten dust in tokamaks; role of dust-wall collisions

S. Ratynskaia (1; L. Vignitchouk (1; P. Tolias (1; I. Bykov (2; H. Bergsåker (2; A. Litnovsky (3; N. den Harder (4; E. Lazzaro (5

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 120o 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.

Nuclear fusion (Online) 53, pp. 642–646

DOI: 10.1088/0029-5515/53/12/123002

InstituteSelected 0/1
    IFP, Istituto di fisica del plasma "Piero Caldirola" (1)
AuthorSelected 0/1
    Lazzaro Enzo (1)
TypeSelected 0/1
    Articolo in rivista (1)
Research programSelected 0/1
    ET.P05.001.001, Fisica e Tecnologia del Plasma e della Fusione Termonucleare (1)
EU Funding ProgramSelected 0/1
    FP7 (1)
EU ProjectSelected 0/1
    EUFORIA (1)
YearSelected 0/1
    2013 (1)
LanguageSelected 0/1
    Inglese (1)
Keyword

wall reflections

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