A subgrid model for electron-scale turbulent transport in global ion-scale gyrokinetic simulations of tokamak plasmas

Tirkas, S.; Chen, Y.; Parker, S.

doi:10.1063/5.0241525

Title: A subgrid model for electron-scale turbulent transport in global ion-scale gyrokinetic simulations of tokamak plasmas

Journal Article · 03 March 2025 · Physics of Plasmas

DOI: https://doi.org/10.1063/5.0241525 · OSTI ID:2526676

^[1];

^[2]; Parker, S. ^[3]

University of Colorado, Boulder, CO (United States)
Center for Integrated Plasma Studies, Boulder, CO (United States)
University of Colorado, Boulder, CO (United States); Renewable and Sustainable Energy Institute, Boulder, CO (United States)

A subgrid electron–temperature–gradient (ETG) model is demonstrated here which averages local electron-scale turbulence over intermediate scales in space and time to include in global ion–temperature–gradient (ITG) simulations. This approach results in ion-scale equations, which incorporate the electron heat transport from ETG turbulence and the effects of electron-scale turbulence on the ion scale. Flux-tube ETG Cyclone Base Case simulations are performed at different radial locations and a kinetic form of the flux is added to global ion-scale (IS) simulations as a source term. Analytic radial profiles of ETG heat flux are constructed and compared to flux-tube results at multiple radial locations. Different ratios of ITG to ETG heat flux levels are considered and the results of capturing ETG heat transport in global ion-scale simulations are discussed. The potential coupling of the ETG streamer potential and intermediate-scale zonal flows to the ion scale is further addressed.

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Research Organization:: University of Colorado, Boulder, CO (United States)

Sponsoring Organization:: National Energy Research Scientific Computing Center (NERSC); USDOE

Grant/Contract Number:: SC0024425

OSTI ID:: 2526676

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 32; ISSN 1070-664X; ISSN 1089-7674

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: A subgrid model for electron-scale turbulent transport in global ion-scale gyrokinetic simulations of tokamak plasmas

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