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Simulations of anomalous ion diffusion in experimentally measured turbulent potential
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SYSNO ASEP 0335887 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Simulations of anomalous ion diffusion in experimentally measured turbulent potential Title Simulace anomální difuze iontů v experimentálně měřeném turbulentním potenciálu Author(s) Seidl, Jakub (UFP-V) RID
Krlín, Ladislav (UFP-V) RID
Pánek, Radomír (UFP-V) RID
Pavlo, Pavol (UFP-V) RID
Stöckel, Jan (UFP-V) RID
Svoboda, V. (CZ)Source Title European Physical Journal D. - : Springer - ISSN 1434-6060
Roč. 54, č. 2 (2009), s. 399-407Number of pages 9 s. Publication form 657.5 kB - 657.5 kB Action Symposium on Plasma Physics and Technology/23rd./ Event date 16.06.2008-19.06.2008 VEvent location Prague Country CZ - Czech Republic Event type WRD Language eng - English Country DE - Germany Keywords plasma turbulence ; Lévy-walk ; anomalous diffusion ; plasma impurities Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects GA202/07/0044 GA ČR - Czech Science Foundation (CSF) IAA100430502 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z20430508 - UFP-V (2005-2011) UT WOS 000268329200038 DOI 10.1140/epjd/e2009-00123-8 Annotation Diffusion of plasma impurities in tokamak-edge-plasma turbulence is investigated numerically. The time-dependent potential governing particle motion was measured by 2D array of 8×8 Langmuir probes in edge region of CASTOR tokamak. The diffusion of particles is found to be classical in the radial direction, but it can be of an anomalous Lévy-walk type in the poloidal direction. It is found to be dependent on the ratio of particles’ mass and charge. When this ratio grows, radial diffusion coefficient grows as well, whereas poloidal diffusion coefficient drops down. Moreover, movement of particles in the time-frozen snapshot of this potential is investigated showing that also time-independent potential is more favorable for the particle diffusion in poloidal direction. In the case of single ionized carbon the poloidal diffusion in time-independent potential transits to the Lévy-walk type for temperatures greater than 25 eV, for radial diffusion Lévy-walk was not observed even for 500 eV. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2010
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