Migration of tungsten dust in tokamaks: Role of dust-wall collisions

S. Ratynskaia, L. Vignitchouk, P. Tolias, I. Bykov, H. Bergsåker, A. Litnovsky, N. Den Harder, E. Lazzaro

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Abstract

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° 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. © 2013 IAEA, Vienna.
Original languageEnglish
Article number123002
Pages (from-to)-
JournalNuclear Fusion
Volume53
Issue number12
DOIs
Publication statusPublished - Dec 2013
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Ratynskaia, S., Vignitchouk, L., Tolias, P., Bykov, I., Bergsåker, H., Litnovsky, A., ... Lazzaro, E. (2013). Migration of tungsten dust in tokamaks: Role of dust-wall collisions. Nuclear Fusion, 53(12), -. [123002]. https://doi.org/10.1088/0029-5515/53/12/123002