Effects of radial electric field on ion temperature gradient driven mode stability

Chen, Ningfei; Hu, Hanyuan; Zhang, Xiangyu; Wei, Shizhao; Qiu, Zhiyong

doi:10.1063/5.0020749

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…The linear dispersion relation of GAM E G is in a general form that incorporates the full finite orbit width (FOW) and FLR effects. Note that the contribution of energetic particles can be formally included in E G , to account for the nonlinear interaction of energeticparticle-induced GAM (EGAM) [33][34][35] with the DW, which was proposed as an active control method for DW turbulence [30] and is under investigation [36,37]. However, in this work, effects of energetic particles will not be included, to focus on the nonlinear interaction of the DW with GAM.…”

Section: Theoretical Modelmentioning

confidence: 99%

Soliton generation and drift wave turbulence spreading via geodesic acoustic mode excitation

Chen¹,

Wei²,

Wei³

et al. 2021

Plasma Phys. Control. Fusion

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The two-field equations that govern fully nonlinear dynamics of the drift wave (DW) and geodesic acoustic mode (GAM) interaction in toroidal geometry are derived within the nonlinear gyrokinetic framework. Two stages with distinctive features are identified and analyzed using both analytical and numerical approaches. In the ‘linear’ growth stage, the derived set of nonlinear equations can be reduced to the intensively studied parametric decay instability, accounting for the spontaneous resonant excitation of GAM by the DW. The main results of previous works on spontaneous GAM excitation, e.g. the greatly enhanced GAM group velocity and the nonlinear growth rate of GAM, are reproduced from the numerical solution of the two-field equations. In the fully nonlinear stage, soliton structures are observed to form due to the balancing of the self-trapping effect by the spontaneously excited GAM and kinetic dispersiveness of the DW. The soliton structures enhance turbulence spreading from the DW linearly unstable region to the stable region, exhibiting convective propagation instead of a typical linear dispersive process, and are thus expected to induce core-edge interaction and nonlocal transport.

show abstract

Section: Theoretical Modelmentioning

confidence: 99%

Soliton generation and drift wave turbulence spreading via geodesic acoustic mode excitation

Chen¹,

Wei²,

Wei³

et al. 2021

Plasma Phys. Control. Fusion

Self Cite

View full text Add to dashboard Cite

show abstract

“…and α i is an order unity coefficient [8]. Note that contribution of energetic particles can be formally included in E G , to account for the nonlinear interaction of energetic particle induced GAM (EGAM) [30][31][32] with DW, which was proposed as an active control method for DW turbulence [28] and is under investigation [33,34]. However, in this work, effects of energetic particles will not be included, to focus on the nonlinear interaction of DW with GAM.…”

Section: Theoretical Modelmentioning

confidence: 99%

Soliton generation and drift wave turbulence spreading via geodesic acoustic mode excitation

Chen¹,

Wei²,

Wei³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

The two-field equations governing fully nonlinear dynamics of the drift wave (DW) and geodesic acoustic mode (GAM) in the toroidal geometry are derived in nonlinear gyrokinetic framework. Two stages with distinctive features are identified and analyzed. In the linear growth stage, the set of nonlinear equations can be reduced to the intensively studied parametric decay instability (PDI), accounting for the spontaneous resonant excitation of GAM by DW. The main results of previous works on spontaneous GAM excitation, e.g., the much enhanced GAM group velocity and the nonlinear growth rate of GAM, are reproduced from numerical solution of the two-field equations. In the fully nonlinear stage, soliton structures are observed to form due to the balancing of the self-trapping effect by the spontaneously excited GAM and kinetic dispersiveness of DW. The soliton structures enhance turbulence spreading from DW linearly unstable to stable region, exhibiting convective propagation instead of typical linear dispersive process, and is thus, expected to induce core-edge interaction and nonlocal transport.

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Effects of radial electric field on kinetic ballooning mode in toroidal plasma

et al. 2023

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Global gyrokinetic particle simulations show that the radial electric field ( Er) shear can suppress the kinetic ballooning mode (KBM) in a toroidal plasma. The linear KBM growth rate reaches a maximum when the toroidal rotation induced by the ion diamagnetic shear is canceled by the E × B flow shear. High toroidal-mode-number (high- n) KBMs are more sensitive to the Er shear than low- n KBMs. Nonlinear simulations find that both the Er shear and a self-generated zonal flow can reduce the nonlinear KBM saturation level with smaller particle and ion heat transport. Meanwhile, the zonal flow can weaken the suppressing effects of the Er shear on KBM nonlinear saturation amplitude. The radial correlation length of the turbulence is reduced by the Er shear and the zonal flow.

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Effects of radial electric field on ion temperature gradient driven mode stability

Cited by 7 publications

References 28 publications

Soliton generation and drift wave turbulence spreading via geodesic acoustic mode excitation

Soliton generation and drift wave turbulence spreading via geodesic acoustic mode excitation

Soliton generation and drift wave turbulence spreading via geodesic acoustic mode excitation

Effects of radial electric field on kinetic ballooning mode in toroidal plasma

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