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Non-Ballooning Electron Temperature Gradient Turbulence in the Tokamak Pedestal

ORAL

Abstract

Tokamak pedestal electron temperature gradient (ETG) turbulence has a complex three-dimensional structure that is highly inhomogeneous in the poloidal direction, particularly at ion scales. Nonlinear multiscale gyrokinetic simulations of Joint European Torus pedestals reveal that ETG pedestal turbulence has maximum fluctuation amplitudes and transport near the top and bottom of a flux surface, rather than the outboard midplane. Its parallel distribution is determined by the magnetic field geometry and steep equilibrium gradients, with magnetic drift and finite Larmor radius effects being particularly important. Nonlinear simulations must run sufficiently long for the slower ion-scale ETG turbulence to saturate and interact with electron-scale ETG turbulence.

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Publication: Planned: Three-Dimensional Electron Temperature Gradient Turbulence in the Tokamak Pedestal

Presenters

  • Jason F Parisi

    EURATOM/CCFE

Authors

  • Jason F Parisi

    EURATOM/CCFE

  • Felix I Parra

    University of Oxford, Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford, OX1 3PU, UK, Oxford University

  • Colin M Roach

    CCFE

  • Michael R Hardman

    University of Oxford

  • Michael Barnes

    University of Oxford, Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford, OX1 3PU, UK, Oxford University

  • William D Dorland

    University of Maryland, College Park, Princeton Plasma Physics Laboratory, University of Maryland Department of Physics, UMD

  • Denis A St-Onge

    University of Oxford

  • Justin Ball

    EPFL

  • David R Hatch

    University of Texas at Austin, Institute for Fusion Studies, University of Texas at Austin

  • David Dickinson

    York Plasma Institute, Department of Physics, University of York, Heslington, York, YO10 5DD, UK, University of York, York Plasma Institute

  • Samuli Saarelma

    General Atomics, CCFE

  • Benjamin Chapman

    CCFE

  • Carine Giroud

    CCFE

  • Jon C Hillesheim

    CCFE, Culham Science Centre

  • Noboyuki Aiba

    National Institutes for Quantum and Radiological Science and Technology