Linear gyrokinetic simulations of zonal flows in toroidal rotating plasmas

2019 ◽  
Vol 26 (5) ◽  
pp. 052514
Author(s):  
Pengfei Zhao ◽  
Lei Ye ◽  
Nong Xiang ◽  
Yingfeng Xu ◽  
Baoyi Xie ◽  
...  
Keyword(s):  
Zonal Flows ◽  
Rotating Plasmas ◽  
Gyrokinetic Simulations

scholarly journals Full radius linear and nonlinear gyrokinetic simulations for tokamaks and stellarators: zonal flows, appliedE×Bflows, trapped electrons and finite beta

2003 ◽  
Vol 44 (1) ◽  
pp. 172-180 ◽  
Author(s):  
L Villard ◽  
S.J Allfrey ◽  
A Bottino ◽  
M Brunetti ◽  
G.L Falchetto ◽  
...  
Keyword(s):  
Trapped Electrons ◽  
Zonal Flows ◽  
Linear And Nonlinear ◽  
Gyrokinetic Simulations

scholarly journals How eigenmode self-interaction affects zonal flows and convergence of tokamak core turbulence with toroidal system size

2020 ◽  
Vol 86 (5) ◽  
Author(s):  
Ajay C. J. ◽  
Stephan Brunner ◽  
Ben McMillan ◽  
Justin Ball ◽  
Julien Dominski ◽  
...  
Keyword(s):  
Turbulent Transport ◽  
Zonal Flow ◽  
System Size ◽  
Flow Shear ◽  
Direction Parallel ◽  
Zonal Flows ◽  
Radial Extent ◽  
Modulational Instabilities ◽  
Gyrokinetic Simulations ◽  
The Magnetic Field

Self-interaction is the process by which a microinstability eigenmode that is extended along the direction parallel to the magnetic field interacts non-linearly with itself. This effect is particularly significant in gyrokinetic simulations accounting for kinetic passing electron dynamics and is known to generate stationary $E\times B$ zonal flow shear layers at radial locations near low-order mode rational surfaces (Weikl et al. Phys. Plasmas, vol. 25, 2018, 072305). We find that self-interaction, in fact, plays a very significant role in also generating fluctuating zonal flows, which is critical to regulating turbulent transport throughout the radial extent. Unlike the usual picture of zonal flow drive in which microinstability eigenmodes coherently amplify the flow via modulational instabilities, the self-interaction drive of zonal flows from these eigenmodes are uncorrelated with each other. It is shown that the associated shearing rate of the fluctuating zonal flows therefore reduces as more toroidal modes are resolved in the simulation. In simulations accounting for the full toroidal domain, such an increase in the density of toroidal modes corresponds to an increase in the toroidal system size, leading to a finite system size effect that is distinct from the well-known profile shearing effect.

scholarly journals Gyrokinetic simulations in general geometry and applications to collisional damping of zonal flows

2000 ◽  
Vol 7 (5) ◽  
pp. 1857-1862 ◽  
Author(s):  
Z. Lin ◽  
T. S. Hahm ◽  
W. W. Lee ◽  
W. M. Tang ◽  
R. B. White
Keyword(s):  
Zonal Flows ◽  
Collisional Damping ◽  
General Geometry ◽  
Gyrokinetic Simulations

scholarly journals The electric field of the electrodes immersed into the rotating plasmas

2019 ◽  
Vol 1147 ◽  
pp. 012130
Author(s):  
G D Liziakin ◽  
A V Gavrikov ◽  
R A Usmanov ◽  
V P Smirnov
Keyword(s):  
Electric Field ◽  
Rotating Plasmas

Rossby Waves on Non-zonal Flows: Vertical Focusing and Effect of the Current Stratification

2021 ◽  
Author(s):  
Vladimir G. Gnevyshev ◽  
Sergei I. Badulin ◽  
Aleksey V. Koldunov ◽  
Tatyana V. Belonenko
Keyword(s):  
Rossby Waves ◽  
Zonal Flows
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