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Impurity Dynamics in Turbulent Plasma in Tokamak Scrape-off Layer
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SYSNO ASEP 0352829 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Impurity Dynamics in Turbulent Plasma in Tokamak Scrape-off Layer Author(s) Seidl, J. (CZ)
Krlín, Ladislav (UFP-V) RIDSource Title Proceedings of the 19th Annual Conference of Doctoral Students - WDS 2010 , 3 - Physics. - Prague : MATFYZPRESS, 2010 / Šafránková J. ; Pavlů J. - ISBN 978-80-7378-141-5 Pages s. 199-204 Number of pages 6 s. Action Annual Conference of Doctoral Students - WDS 2010 /19th./ Event date 01.06.2010-04.06.2010 VEvent location Prague Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords plasma turbulence ; plasma impurities ; impurity transport Subject RIV BL - Plasma and Gas Discharge Physics CEZ AV0Z20430508 - UFP-V (2005-2011) Annotation 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. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2011
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