Effect of triangularity on ion-temperature-gradient-driven turbulence

Duff, J. M.; Faber, B. J.; Hegna, C. C.; Pueschel, M. J.; Terry, P. W.

doi:10.1063/5.0065585

Title: Effect of triangularity on ion-temperature-gradient-driven turbulence

Journal Article · 04 January 2022 · Physics of Plasmas

DOI: https://doi.org/10.1063/5.0065585 · OSTI ID:1864836

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^[3]; Terry, P. W. ^[2]

Univ. of Wisconsin, Madison, WI (United States); University of Wisconsin-Madison
Univ. of Wisconsin, Madison, WI (United States)
Dutch Inst. for Fundamental Energy Research, Eindhoven (The Netherlands); Eindhoven Univ. of Technology (The Netherlands)

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. Here, 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.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

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

Grant/Contract Number:: FG02-99ER54546; FG02-86ER53218; FG02-93ER54222; FG02-89ER53291; AR0001287; AC02-05CH11231

OSTI ID:: 1864836

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 1 Vol. 29; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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