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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, p. 327-332Article 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, p. 327-332
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, id: diva2:333205
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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