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Generation of sheared flows by drift waves in a strongly magnetized electron-positron-ion plasma
Umeå University, Faculty of Science and Technology, Department of Physics.
2011 (English)In: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 77, 339-344 p.Article in journal (Refereed) Published
Abstract [en]

It is shown that sheared/zonal flows (ZFs) can be nonlinearly excited by incoherent drift waves (DWs) in a strongly magnetized non-uniform plasma composed of electrons, positrons and ions. The dynamics of incoherent DWs in the presence of ZFs is governed by a wave-kinetic equation. The governing equation for ZFs in the presence of nonlinear forces (associated with nonlinear ion polarization and nonlinear ion-diamagnetic drifts) of the DWs is deduced by combining the Poisson equation, as well as the e-p-i continuity equations, together with appropriate plasma particle velocities in the DW and the ZF fields. Standard techniques are used to derive a nonlinear dispersion relation, which depicts two classes of the modulational instability of the DWs against the ZFs. Non-thermal ZFs can reduce the turbulent cross-field particle transport in non-uniform, strongly magnetized e-p-i plasmas.

Place, publisher, year, edition, pages
2011. Vol. 77, 339-344 p.
National Category
Physical Sciences Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:umu:diva-104868DOI: 10.1017/S0022377810000309ISI: 000290212200005OAI: oai:DiVA.org:umu-104868DiVA: diva2:821621
Available from: 2015-06-15 Created: 2015-06-15 Last updated: 2017-12-04Bibliographically approved

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