Effect of triangularity on ion-temperature-gradient-driven turbulence
Abstract
The linear and nonlinear properties of ion-temperature-gradient-driven turbulence with adiabatic electrons are modeled for axisymmetric configurations for a broad range of triangularities δ, both negative and positive. Peak linear growth rates decrease with negative δ but increase and shift toward a finite radial wavenumber kx with positive δ. The growth-rate spectrum broadens as a function of kx with negative δ and significantly narrows with positive δ. The effect of triangularity on linear instability properties can be explained through its impact on magnetic polarization and curvature. Nonlinear heat flux is weakly dependent on triangularity for |δ|≤0.5, decreasing significantly with extreme δ, regardless of sign. Zonal modes play an important role in nonlinear saturation in the configurations studied, and artificially suppressing zonal modes increased nonlinear heat flux by a factor of about four for negative δ, increasing with positive δ by almost a factor of 20. Proxies for zonal-flow damping and drive suggest that zonal flows are enhanced with increasing positive δ.
- Authors:
-
[1];
[1];
[1];
[2];
- Univ. of Wisconsin, Madison, WI (United States)
- Dutch Inst. for Fundamental Energy Research, Eindhoven (The Netherlands); Eindhoven Univ. of Technology (The Netherlands)
- Publication Date:
- Research Org.:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1864836
- Alternate Identifier(s):
- OSTI ID: 1838214
- Grant/Contract Number:
- FG02-99ER54546; FG02-86ER53218; FG02-93ER54222; FG02-89ER53291; AR0001287; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 29; Journal Issue: 1; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Plasma confinement; Plasma flows; Tokamaks; Plasma instabilities; Gyrokinetic simulations
Citation Formats
Duff, J. M., Faber, B. J., Hegna, C. C., Pueschel, M. J., and Terry, P. W. Effect of triangularity on ion-temperature-gradient-driven turbulence. United States: N. p., 2022.
Web. doi:10.1063/5.0065585.
Duff, J. M., Faber, B. J., Hegna, C. C., Pueschel, M. J., & Terry, P. W. Effect of triangularity on ion-temperature-gradient-driven turbulence. United States. https://doi.org/10.1063/5.0065585
Duff, J. M., Faber, B. J., Hegna, C. C., Pueschel, M. J., and Terry, P. W. Tue .
"Effect of triangularity on ion-temperature-gradient-driven turbulence". United States. https://doi.org/10.1063/5.0065585. https://www.osti.gov/servlets/purl/1864836.
@article{osti_1864836,
title = {Effect of triangularity on ion-temperature-gradient-driven turbulence},
author = {Duff, J. M. and Faber, B. J. and Hegna, C. C. and Pueschel, M. J. and Terry, P. W.},
abstractNote = {The linear and nonlinear properties of ion-temperature-gradient-driven turbulence with adiabatic electrons are modeled for axisymmetric configurations for a broad range of triangularities δ, both negative and positive. Peak linear growth rates decrease with negative δ but increase and shift toward a finite radial wavenumber kx with positive δ. The growth-rate spectrum broadens as a function of kx with negative δ and significantly narrows with positive δ. The effect of triangularity on linear instability properties can be explained through its impact on magnetic polarization and curvature. Nonlinear heat flux is weakly dependent on triangularity for |δ|≤0.5, decreasing significantly with extreme δ, regardless of sign. Zonal modes play an important role in nonlinear saturation in the configurations studied, and artificially suppressing zonal modes increased nonlinear heat flux by a factor of about four for negative δ, increasing with positive δ by almost a factor of 20. Proxies for zonal-flow damping and drive suggest that zonal flows are enhanced with increasing positive δ.},
doi = {10.1063/5.0065585},
journal = {Physics of Plasmas},
number = 1,
volume = 29,
place = {United States},
year = {Tue Jan 04 00:00:00 EST 2022},
month = {Tue Jan 04 00:00:00 EST 2022}
}
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