Impurity Dynamics in Turbulent Plasma in Tokamak Scrape-off Layer

0352829 - ÚFP 2011 RIV CZ eng C - Conference Paper (international conference)
Seidl, J. - Krlín, Ladislav
Impurity Dynamics in Turbulent Plasma in Tokamak Scrape-off Layer.
Proceedings of the 19th Annual Conference of Doctoral Students - WDS 2010. Vol. 3. Prague: MATFYZPRESS, 2010 - (Šafránková, J.; Pavlů, J.), s. 199-204. ISBN 978-80-7378-141-5.
[Annual Conference of Doctoral Students - WDS 2010 /19th./. Prague (CZ), 01.06.2010-04.06.2010]
Institutional research plan: CEZ:AV0Z20430508
Keywords : plasma turbulence * plasma impurities * impurity transport
Subject RIV: BL - Plasma and Gas Discharge Physics

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.
Permanent Link: http://hdl.handle.net/11104/0192242