Migration of tungsten dust in tokamaks: role of dust–wall collisions

TitleMigration of tungsten dust in tokamaks: role of dust–wall collisions
Publication TypeJournal Article
Year of Publication2013
AuthorsS. Ratynskaia, L. Vignitchouk, P. Tolias, I. Bykov, H. Bergsåker, A. Litnovsky, N. den Harder, E. Lazzaro
JournalNuclear Fusion
Volume53
Number12
Pagination123002
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.

URLhttp://stacks.iop.org/0029-5515/53/i=12/a=123002
DOI10.1088/0029-5515/53/12/123002
Division

PSI

Department

PSI-E

PID

017a6af3e0440524ab38a5c0d83c0386

Alternate TitleNucl. Fusion

Go back one page.