Ion transport barriers triggered by plasma polarization in gyrokinetic simulations

The creation of ion transport barriers by externally induced sheared E × B flows is investigated with the global, full-f and flux-driven gyrokinetic code GYSELA. A gyrokinetic source of vorticity is designed and proves to be efficient in polarizing the plasma. Induced sheared electric fields develop...

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Published inPlasma physics and controlled fusion Vol. 55; no. 7; pp. 74013 - 9
Main Authors Strugarek, A, Sarazin, Y, Zarzoso, D, Abiteboul, J, Brun, A S, Cartier-Michaud, T, Dif-Pradalier, G, Garbet, X, Ghendrih, Ph, Grandgirard, V, Latu, G, Passeron, C, Thomine, O
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.07.2013
Subjects
Barriers
Controlled fusion
Ion transport
Plasma (physics)
Polarization
Transport
Turbulence
Vorticity
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Summary:The creation of ion transport barriers by externally induced sheared E × B flows is investigated with the global, full-f and flux-driven gyrokinetic code GYSELA. A gyrokinetic source of vorticity is designed and proves to be efficient in polarizing the plasma. Induced sheared electric fields develop in the turbulent core and are accompanied by the creation of a transport barrier. The barrier and the sheared flow relax quasi-periodically because of zonal flow activity and a destabilizing temperature anisotropy induced by the vorticity source. A new cyclic mechanism leading to the relaxation of transport barriers in tokamaks is discovered.
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ISSN:0741-3335
1361-6587
DOI:10.1088/0741-3335/55/7/074013