De Angelis, Umberto and Fedele, Renato (2007) Effects of dust particles on the dynamics of blobs in the scrape off layer. [Pubblicazione in rivista scientifica]

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Item Type: Pubblicazione in rivista scientifica
Lingua: English
Title: Effects of dust particles on the dynamics of blobs in the scrape off layer
De Angelis, UmbertoUNSPECIFIED
Autore/i: D. Jovanovic, U. De ANGELIS, R. FEDELE, F. Pegoraro
Date: 2007
Number of Pages: 15
Department: Scienze fisiche
Identification Number: 10.1063/1.2767617
Official URL:
Journal or Publication Title: PHYSICS OF PLASMAS
Date: 2007
Volume: 14
Number: 8
Page Range: 083704-1-083704-15
Number of Pages: 15
Uncontrolled Keywords: dusty plasmas, blobs, energy transport in the scrape-off layer
Identification Number: 10.1063/1.2767617
Date Deposited: 20 Oct 2010 08:34
Last Modified: 30 Apr 2014 19:42


A numerical study is presented of the evolution of plasma blobs in the scrape-off layer of a tokamak, in the presence of dust. Appropriate fluid model equations for the nonlinear interchange mode in a dusty plasma are derived, accounting for the attachment of electrons and ions, as well as for their scattering by the dust particulates, and the symmetry breaking between the electron and ion densities due to the dust charging. The dust is shown to introduce three new dissipative mechanisms that determine the blob dynamics, namely the sink of electrons by the attachment to the dust, the sink of the ion momentum by the attachment to, and scattering by, the dust, and the modification of the current outflow to the conductive wall due to the asymmetry between the electron and ion flows to the wall introduced by the dust. A new method for the detection of dust in a scrape-off layer during tokamak discharges is suggested, based on the qualitative difference between the blob dynamics in collisionless and dusty plasmas.


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