Gyrokinetic simulations of mesoscale energetic particle-driven Alfvénic turbulent transport embedded in microturbulence

2010 ◽  
Vol 17 (11) ◽  
pp. 112319 ◽  
Author(s):  
E. M. Bass ◽  
R. E. Waltz
Keyword(s):  
Energetic Particle ◽  
Turbulent Transport ◽  
Gyrokinetic Simulations

scholarly journals Characterizing turbulent transport in ASDEX Upgrade L-mode plasmas via nonlinear gyrokinetic simulations

2013 ◽  
Vol 20 (12) ◽  
pp. 122312 ◽  
Author(s):  
D. Told ◽  
F. Jenko ◽  
T. Görler ◽  
F. J. Casson ◽  
E. Fable ◽  
...  
Keyword(s):  
Turbulent Transport ◽  
Gyrokinetic Simulations

Gyrokinetic Simulations of Turbulent Transport in a Ring Dipole Plasma

2009 ◽  
Vol 103 (5) ◽  
Author(s):  
Sumire Kobayashi ◽  
Barrett N. Rogers ◽  
William Dorland
Keyword(s):  
Turbulent Transport ◽  
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.

Gyrokinetic simulations of turbulent transport: size scaling and chaotic behaviour

2010 ◽  
Vol 52 (12) ◽  
pp. 124038 ◽  
Author(s):  
L Villard ◽  
A Bottino ◽  
S Brunner ◽  
A Casati ◽  
J Chowdhury ◽  
...  
Keyword(s):  
Turbulent Transport ◽  
Chaotic Behaviour ◽  
Size Scaling ◽  
Gyrokinetic Simulations

Joint meeting of 9th Asia Pacic-Transport Working Group (APTWG) & EU-US Transport Task Force (TTF) workshop

2021 ◽  
Author(s):  
Katsumi Ida ◽  
Rachael M McDermott ◽  
Christopher Holland ◽  
Minjun J. Choi ◽  
Liming Yu ◽  
...  
Keyword(s):  
Isotope Effect ◽  
Working Group ◽  
Energetic Particle ◽  
Task Force ◽  
Turbulent Transport ◽  
Conference Report ◽  
Asia Pacific ◽  
Joint Meeting ◽  
Isotope Mixture ◽  
Mixture Plasma

Abstract This conference report summarizes the contributions to, and discussions at the joint meeting of the 9th Asia Pacific-Transport Working Group (APTWG) & EU-US Transport Task Force (TTF) workshop held online, hosted by Kyushu University, Japan, during 6-9 July 2021. The topics of the meeting were organized under five main topics: 1)Isotope effect on transport and physics on isotope mixture plasma, 2)Turbulence spreading and coupling in core-edge-SOL, 3)Interplay between MHD topology/instability and turbulent transport, 4)Interaction between energetic particle driven instability and transport, 5)Model reduction and experiments for validation.

scholarly journals Advancing the physics basis for quasi-helically symmetric stellarators

2020 ◽  
Vol 86 (5) ◽  
Author(s):  
A. Bader ◽  
B. J. Faber ◽  
J. C. Schmitt ◽  
D. T. Anderson ◽  
M. Drevlak ◽  
...  
Keyword(s):  
Energetic Particle ◽  
Turbulent Transport ◽  
Three Dimensional ◽  
Plasma Pressure ◽  
Ion Temperature ◽  
Single Filament ◽  
Ion Temperature Gradient ◽  
Vessel Volume ◽  
Energetic Particle Transport ◽  
Particle Confinement

A new optimized quasi-helically symmetric configuration is described that has the desirable properties of improved energetic particle confinement, reduced turbulent transport by three-dimensional shaping and non-resonant divertor capabilities. The configuration presented in this paper is explicitly optimized for quasi-helical symmetry, energetic particle confinement, neoclassical confinement and stability near the axis. Post optimization, the configuration was evaluated for its performance with regard to energetic particle transport, ideal magnetohydrodynamic stability at various values of plasma pressure and ion temperature gradient instability induced turbulent transport. The effects of discrete coils on various confinement figures of merit, including energetic particle confinement, are determined by generating single-filament coils for the configuration. Preliminary divertor analysis shows that coils can be created that do not interfere with expansion of the vessel volume near the regions of outgoing heat flux, thus demonstrating the possibility of operating a non-resonant divertor.

scholarly journals Gyrokinetic simulations for turbulent transport of multi-ion-species plasmas in helical systems

2020 ◽  
Vol 27 (5) ◽  
pp. 052501
Author(s):  
M. Nunami ◽  
M. Nakata ◽  
S. Toda ◽  
H. Sugama
Keyword(s):  
Turbulent Transport ◽  
Ion Species ◽  
Gyrokinetic Simulations
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