Abstract Details
Abstracts
Author: Ehab Hassan
Requested Type: Poster
Submitted: 2023-04-24 08:01:53
Co-authors: D.R.Hatch
Contact Info:
ORNL
PO Box 2008
Oak Ridge, TN 37831
USA
Abstract Text:
A set of non-inductive core-edge plasma scenarios for the Fusion National Science Facility (FNSF) were developed in the IPS-FASTRAN framework [1] for a range of pedestal densities and plasma currents by implementing various heating and current drive schemes. The heat and particle fluxes from the unstable Electron Temperature-Gradient (ETG) modes were calculated at multiple locations in the pedestal region using an algebraic model [2]. This model results from a linear fitting of the heat and particle fluxes from nonlinear simulations of 61 discharges from different tokamaks. On the other hand, frequencies from a series of local linear simulations in GENE gyrokinetic code at three locations in the pedestal for a range of wavenumber (k_theta*rho_s= 10 – 240) show multiple branches of the ETG instabilities. The quasilinear model in [2] used the results from these local linear simulations to recalculate the heat and particle fluxes from the unstable ETG modes. Comparing the heat and particle fluxes calculated in the quasilinear and algebraic models found them in an acceptable agreement.
References:
[1] Hassan, Ehab, et al. "Core-Pedestal Plasma Configurations in Advanced Tokamaks." Fusion Science and Technology (2023): 1-24.
[2] Hatch, D. R., et al. "Reduced models for ETG transport in the tokamak pedestal." Physics of Plasmas 29.6 (2022): 062501.
Acknowledgements: This work was supported by the US Department of Energy, Office of Science, Basic Energy Sciences Program under contract numbers DE-AC05-00OR22725 and DE-SC0017992.
Comments: