Electron temperature gradient instability and transport analysis in NSTX and NSTX-U plasmas

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C. F. Clauser, T. Rafiq, J. Parisi, G. Avdeeva, W. Guttenfelder, E. Schuster, C. Wilson, 2025, "Electron temperature gradient instability and transport analysis in NSTX and NSTX-U plasmas", https://doi.org/10.7910/DVN/SJTAD2, Harvard Dataverse, V1
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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.
Subject Physics
Keyword electron temperature gradient, etg, microturbulence, multi-mode-model, NSTX, TGLF, tokamak, transport
Notes CITATION: Phys. Plasmas 32, 022305 (2025)

DOI: https://doi.org/10.1063/5.0232697

PSFC REPORT PSFC/JA-24-179

This work was supported by the U.S. Department of Energy, Office of Science, under Award Numbers DE-SC0021385, DE- SC0013977, DE-SC0021113, and DE-AC02-09CH11466. This research used resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy Office of Science User Facility. The authors acknowledge NSTX-U scientists, who helped make the experimental profile measurements.

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