Abstract
In magnetized plasma turbulence, the couplings of perpendicular spatial scales that arise due to the nonlinear interactions are analyzed from the perspective of the freeenergy exchanges. The plasmas considered here, with appropriate ion or electron adiabatic electroneutrality responses, are described by the gyrokinetic formalism in a toroidal magnetic geometry. Turbulence develops due to the electrostatic fluctuations driven by temperature gradient instabilities, either ion temperature gradient (ITG) or electron temperature gradient (ETG). The analysis consists in decomposing the system into a series of scale structures, while accounting separately for contributions made by modes possessing special symmetries (e.g., the zonal flow modes). The interaction of these scales is analyzed using the energy transfer functions, including a forward and backward decomposition, scale fluxes, and locality functions. The comparison between the ITG and ETG cases shows that ETG turbulence has a more pronounced classical turbulent behavior, exhibiting a stronger energy cascade, with implications for gyrokinetic turbulence modeling.
Original language  English 

Pages (fromto)  72308 
Journal  Physics of Plasmas 
Volume  21 
Issue number  7 
DOIs  
Publication status  Published  Jul 2014 
Bibliographical note
The full text is available free from the link given. The published version can be found at http://dx.doi.org/10.1063/1.4890127 .Keywords
 plasma physics
 ion temperature gradient mode
 energy transfer
 free energy
 plasma gyrokinetics
 electrostatics
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Profiles

Bogdan Teaca
 Faculty Research Centre in Fluid and Complex Systems  Assistant Professor (Academic)
Person: Teaching and Research