Bulletin of the American Physical Society
63rd Annual Meeting of the APS Division of Plasma Physics
Volume 66, Number 13
Monday–Friday, November 8–12, 2021; Pittsburgh, PA
Session CO07: MFE: Turbulence and Transport I
2:00 PM–5:00 PM,
Monday, November 8, 2021
Room: Rooms 315-316
Chair: Ian Abel, IREAP, University of Maryland, College Park
Abstract: CO07.00006 : Gyrokinetic modeling of electron temperature gradient turbulence in a tokamak pedestal*
3:24 PM–3:36 PM
Presenter:
Justin Walker
(Insititute for Fusion Studies)
Authors:
Justin Walker
(Insititute for Fusion Studies)
David R Hatch
(University of Texas at Austin)
This work uses gyrokinetic simulations to study in detail the linear and nonlinear (turbulent) states driven by the electron temperature gradient instability (ETG) in a tokamak pedestal.
The system is dominated by modes with fine parallel structure, requiring large resolution in order to correctly predict the heat flux. In contrast to core plasmas, the nonlinear phase of the system has fewer characteristics of the linear model. E.g. the dominant linear modes are not prominent in the nonlinear state. Heat-flux spectra are downshifted to smaller bi-normal wavenumbers, which is relevant for quasilinear modeling. The system saturates via an inverse cascade of energy to large scales, while critical balance is maintained over a wide range of scales, particularly at small scales.
*This work was supported by U.S. DOE Contract No. DE-SC0018148 and the SciDAC Partnership for Multiscale Gyrokinetic Turbulence.
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