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Interchange Driven Turbulence and Bellan Instability in Tokamak Scrape-off Layer
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SYSNO ASEP 0336698 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Interchange Driven Turbulence and Bellan Instability in Tokamak Scrape-off Layer Title Bellanova nestabilita u nečistot zachycených v turbulentních strukturách v okrajové vrstvě tokamaku Author(s) Seidl, J. (CZ)
Krlín, Ladislav (UFP-V) RIDSource Title WDS'09 Proceedings of Contributed Papers, Part III - Physics. - Prague : Matfyzpress, 2009 / Šafránková J. ; Pavlů J. - ISBN 978-80-7378-103-3 Pages s. 64-70 Number of pages 7 s. Publication form web - web Action Annual conference of doctoral students - WDS 2009 /18./ Event date 02.06.2009-05.06.2009 VEvent location Prague Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords plasma turbulence ; plasma impurities ; impurity transport ; Bellan instability ; turbulence modeling Subject RIV BL - Plasma and Gas Discharge Physics CEZ AV0Z20430508 - UFP-V (2005-2011) Annotation We present description of an electrostatic turbulent model ESEL and explain interchange mechanism leading to turbulence generation in tokamak scrape-off layer. After introducing theory of Bellan instability, threshold for particle detrapping from turbulent structures (blobs) due to their finite Larmor orbits is discussed for the case of turbulence simulated by the ESEL model. Since plasma potential as well as floating potential are available from the simulation, it is possible to evaluate error made by using experimentally obtained floating potential in simulations of particle diffusion. It is shown that due to bipolar nature of blobs the outflow of particles from the blob caused by Bellan instability can be, in certain conditions, asymmetric and localized mainly into its upper and inner boundary. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2010
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