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Title: Electron Temperature Gradient Driven Transport Model for Tokamak Plasmas
Contributors: Wilson, Christopher
Rafiq, Tariq
Wilson, Christopher
Luo, Lixiang
Weiland, Jan
Schuster, Eugenio
Pankin, Alexei
Guttenfelder, Walter
Kaye, Stan
U. S. Department of Energy contract number US DOE DE-SC0021385 and DE-SC0013977
Keywords: ETG
Turbulence and transport
Issue Date: 30-Aug-2022
Publisher: Princeton Plasma Physics Laboratory, Princeton University
Related Publication: Phys plasmas
Abstract: A new model for electron temperature gradient (ETG) modes is developed as a component of the Multi-Mode anomalous transport module [T. Rafiq \textit{et al.,} Phys Plasmas \textbf{20}, 032506 (2013)] to predict a time dependent electron temperature profile in conventional and low aspect ratio tokamaks. This model is based on two-fluid equations that govern the dynamics of low-frequency short- and long-wavelength electromagnetic toroidal ETG driven drift modes. A low collisionality NSTX discharge is used to scan the plasma parameter dependence on the ETG real frequency, growth rate, and electron thermal diffusivity. Electron thermal transport is discovered in the deep core region where modes are more electromagnetic in nature. Several previously reported gyrokinetic trends are reproduced, including the dependencies of density gradients, magnetic shear, $\beta$ and gradient of $\beta$ $(\betap)$, collisionality, safety factor, and toroidicity, where $\beta$ is the ratio of plasma pressure to the magnetic pressure. The electron heat diffusivity associated with the ETG mode is discovered to be on a scale consistent with the experimental diffusivity determined by power balance analysis.
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