Electron temperature gradient instability and transport analysis in NSTX and NSTX-U plasmas
Year: 2025
Type: article
Abstract: Extensive linear and nonlinear simulations to study electron temperature gradient (ETG) stability and thermal transport in National Spherical Torus Experiment (NSTX) and NSTX-U plasmas were performed using the fully electromagnetic gyrokinetic code CGYRO. Linear simulations were performed to determine ETG thresholds in different discharges, showing that ETG modes in spherical tokamaks can present different scalings compared to conventional aspect-ratio tokamaks. Nonlinear gyrokinetic simulations were conducted for selected cases to calculate electron thermal transport and compare to experimental values. Results are also compared with those of ETG modes in the multi-mode model and the Trapped-Gyro-Landau-Fluid reduced model codes, to better understand their applicability in spherical tokamaks.
Source: Physics of Plasmas
DOI: 10.1063/5.0232697
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Awards: HIGH-PERFORMANCE SCENARIO DEVELOPMENT IN NSTX-U VIA PHYSICS-BASED MODELING AND MODEL-BASED CONTROL, PREDICT-FIRST MODELING AND EXPERIMENTAL DEMONSTRATION OF A FULLY NONINDUCTIVE SCENARIO IN NSTX-U, G516483051, ADVANCES IN THE THEORY OF REDUCED ANOMALOUS TRANSPORT MODELING AND CONFINEMENT OF TOKAMAK PLASMAS
OpenAlex ID: W4407959989