Saturation and nonlinear electromagnetic stabilization of ITG turbulence

被引：22

作者：

Whelan, G. G. ^{[1
]}

Pueschel, M. J. ^{[2
]}

Terry, P. W. ^{[1
]}

Citrin, J. ^{[3
]}

McKinney, I. J. ^{[1
]}

Guttenfelder, W. ^{[4
]}

Doerk, H. ^{[5
]}

机构：

[1] Univ Wisconsin, Madison, WI 53706 USA

[2] Univ Texas Austin, Inst Fus Studies, Austin, TX 78712 USA

[3] DIFFER, NL-5612 AJ Eindhoven, Netherlands

[4] Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA

[5] Max Planck Inst Plasma Phys, D-85748 Garching, Germany

来源：

PHYSICS OF PLASMAS | 2019年 / 26卷 / 08期

关键词：

ZONAL FLOWS; TRANSPORT; STABILITY; MODE;

D O I：

10.1063/1.5096252

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Energy transfer in ion-temperature-gradient-driven (ITG) turbulence and its role in modeling transport are examined for finite normalized plasma pressure beta for a number of test cases and experimental discharges. The analysis shows that like the zero-beta case, finite-beta ITG turbulence saturates by nonlinear energy transfer to stable modes mediated by a zonal flow. Electromagnetic effects reliably increase stable mode amplitudes but affect heat fluxes only at the approximate to 5% level. The most important change with increased beta is an increase in the correlation time of the triplet interaction of the unstable mode, stable mode, and zonal flow, thus providing a heightened nonlinear energy transfer efficiency, which allows the instability to saturate at lower amplitude. The heat flux is examined in connection with nonlinear electromagnetic stabilization, the phenomenon where the flux falloff with beta is more pronounced than the falloff predicted by quasilinear transport models. The inclusion of the triplet correlation time in the quasilinear model captures most of the nonlinearly enhanced stabilization for the configurations studied here.

引用

页数：15

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