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physics.plasm-ph2024
A Subgrid Model for Electron-Scale Turbulent Transport in Global Ion-Scale Gyrokinetic Simulations of Tokamak Plasmas
Stefan Tirkas, Yang Chen, Scott Parker
A subgrid electron-temperature-gradient (ETG) model is demonstrated here which averages local electron-scale turbulence from the GENE code over intermediate scales in space and tim…
physics.plasm-ph2023
Comparison of saturation rules used for gyrokinetic quasilinear transport modeling
Scott E. Parker, Calder Haubrich, Qiheng Cai +2
Theory-based transport modeling has been widely successful and is built on the foundations of quasilinear theory. Specifically, the quasilinear expression of the flux can be used i…
physics.plasm-ph2020
Excitation of Zonal Flow by Intermediate-Scale Toroidal Electron Temperature Gradient Turbulence
Haotian Chen, Stefan Tirkas, Scott E. Parker
We show that zonal flow can be preferentially excited by intermediate-scale toroidal electron temperature gradient (ETG) turbulence in tokamak plasmas. Previous theoretical studies…