Electron temperature gradient driven transport model for tokamak plasmas

Rafiq, Tariq; Wilson, Christopher; Luo, Lixiang; Weiland, Jan; Schuster, Eugenio; Pankin, Alexei Y.; Guttenfelder, Walter; Kaye, Stanley

doi:10.1063/5.0104672

Title: Electron temperature gradient driven transport model for tokamak plasmas

Journal Article · Tue Sep 20 00:00:00 EDT 2022 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0104672· OSTI ID:1887955

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^[1]; Luo, Lixiang ^[1]; Weiland, Jan ^[1]; Schuster, Eugenio ^[1];

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Lehigh Univ., Bethlehem, PA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

A new model for electron temperature gradient (ETG) modes is developed as a component of the multi-mode anomalous transport module [Rafiq et al., Phys Plasmas 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, β and gradient of β (β'), collisionality, safety factor, and toroidicity, where β is the ratio of the plasma pressure to the magnetic pressure. Furthermore, 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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Research Organization:: Lehigh Univ., Bethlehem, PA (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0021385; SC0013977

OSTI ID:: 1887955

Alternate ID(s):: OSTI ID: 1888351; OSTI ID: 1888527

Journal Information:: Physics of Plasmas, Vol. 29, Issue 9; Related Information: The digital data for this paper can be found at the PrincetonPlasma Physics Laboratory http://arks.princeton.edu/ark:/88435/dsp015d86p342b [DataSpace].; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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