The energetic coupling of scales in gyrokinetic plasma turbulence

Bogdan Teaca, A.B. Navarro, F. Jenko

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    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 free-energy exchanges. The plasmas considered here, with appropriate ion or electron adiabatic electro-neutrality 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 languageEnglish
    Pages (from-to)72308
    JournalPhysics of Plasmas
    Volume21
    Issue number7
    DOIs
    Publication statusPublished - Jul 2014

    Fingerprint

    plasma turbulence
    temperature gradients
    turbulence
    electron energy
    ion temperature
    energy transfer
    transfer functions
    cascades
    free energy
    interactions
    electrostatics
    formalism
    decomposition
    symmetry
    geometry
    ions
    electrons

    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

    Cite this

    The energetic coupling of scales in gyrokinetic plasma turbulence. / Teaca, Bogdan; Navarro, A.B.; Jenko, F.

    In: Physics of Plasmas, Vol. 21, No. 7, 07.2014, p. 72308.

    Research output: Contribution to journalArticle

    Teaca, Bogdan ; Navarro, A.B. ; Jenko, F. / The energetic coupling of scales in gyrokinetic plasma turbulence. In: Physics of Plasmas. 2014 ; Vol. 21, No. 7. pp. 72308.
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