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Anomalous ion diffusion and radial-electric-field generation in a turbulent edge plasma potential weakly correlated in time and space
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
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2005 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. 72, no 4, 327-332 p.Article in journal (Refereed) Published
Abstract [en]

Using a simple model of tokamak-edge-plasma turbulence in the form of a spatially periodic and time-independent electrostatic potential, we have found recently a new type of anomalous impurity diffusion in this regime [1], [2]. In the present contribution, we estimate this diffusion in the test-particle approach for a real turbulent potential obtained in an experiment. A significant difference in the impurity dynannics between the Hamiltonian and drift approaches is observed. As an interesting consequence of these dynamics, the possibility of radial-electric-field generation in the turbulence regimes appears. This effect can be of importance in scenarios related to transport barriers.

Place, publisher, year, edition, pages
2005. Vol. 72, no 4, 327-332 p.
Keyword [en]
scrape-off layer, electrostatic turbulence, transport, model
Identifiers
URN: urn:nbn:se:kth:diva-15164DOI: 10.1238/Physica.Regular.072a00327ISI: 000233084400007Scopus ID: 2-s2.0-27644501404OAI: oai:DiVA.org:kth-15164DiVA: diva2:333205
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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