Original title: Impurity Dynamics in Turbulent Plasma in Tokamak Scrape-off Layer
Authors: Seidl, J. ; Krlín, Ladislav
Document type: Papers
Conference/Event: Annual Conference of Doctoral Students - WDS 2010 /19th./, Prague (CZ), 2010-06-01 / 2010-06-04
Year: 2010
Language: eng
Abstract: We simulate behavior of plasma impurities in turbulent potential in tokamak scrape-off layer. Assuming low density of impurities we use test particle approach to investigate movement of individual particles in time evolving potential of isolated structure generated by interchange instability. Behavior of the plasma is modeled using reduced fluid model. We compare behavior of test particles under guiding center drift approximation with full-orbit 2D Hamiltonian equations of motion. While we find flow of particles governed purely by ExB drift to be incompressible, including also polarization drift results in compressibility of the flow. Particles traced along their full orbits exhibit the compressibility as well, however, larger in space and different in its amplitude. We therefore conclude that neglecting finite Larmor radius and assuming dynamics based on drift approximation may introduce significant error into simulations of impurity behavior in tokamak SOL.
Keywords: impurity transport; plasma impurities; plasma turbulence
Project no.: CEZ:AV0Z20430508 (CEP)
Host item entry: Proceedings of the 19th Annual Conference of Doctoral Students - WDS 2010 , ISBN 978-80-7378-141-5

Institution: Institute of Plasma Physics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0192242

Permalink: http://www.nusl.cz/ntk/nusl-42264


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