Effects of dust particles on the dynamics of blobs in the scrape off layer

DE ANGELIS, UMBERTO and FEDELE, RENATO (2007) Effects of dust particles on the dynamics of blobs in the scrape off layer. [Pubblicazione su rivista scientifica]

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URL: http://scitation.aip.org/pop/


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.

Tipologia di documento:Pubblicazione su rivista scientifica
Parole chiave:dusty plasmas, blobs, energy transport in the scrape-off layer
Settori scientifico-disciplinari MIUR:Non specificato
Stato del full text:Accessibilità ristretta
Altri Autori:D. Jovanovic, U. De ANGELIS, R. FEDELE, F. Pegoraro
Numero di pagine:15
Intervallo di pagina:083704-1-083704-15
Dipartimento o Struttura:Dipartimento di Scienze Fisiche
Numero identificativo:10.1063/1.2767617
Titolo rivista/pubblicazione:PHYSICS OF PLASMAS
Numero di sistema:6690
Depositato il:20 Ottobre 2010 10:34
Ultima modifica:20 Ottobre 2010 10:34

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