Results 31 to 40 of about 464 (190)
System Size Effects on Gyrokinetic Turbulence [PDF]
Physical Review Letters, 2010 The scaling of turbulence-driven heat transport with system size in magnetically confined plasmas is reexamined using first-principles based numerical simulations. Two very different numerical methods are applied to this problem, in order to resolve a long-standing quantitative disagreement, which may have arisen due to inconsistencies in the ...
McMillan, B. +7 more
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Fast transport simulations with higher-fidelity surrogate models for ITER [PDF]
, 2023 A fast and accurate turbulence transport model based on quasilinear gyrokinetics is developed. The model consists of a set of neural networks trained on a bespoke quasilinear GENE dataset, with a saturation rule calibrated to dedicated nonlinear ...
Jenko, F. +14 more
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Transport in gyrokinetic tokamaks [PDF]
Physics of Plasmas, 1995 A comprehensive study of transport in full-volume gyrokinetic (GK) simulations of ion temperature gradient driven turbulence in core tokamak plasmas is presented. Though this ‘‘gyrokinetic tokamak’’ is much simpler than experimental tokamaks, such simplicity is an asset, because a dependable nonlinear transport theory for such systems should be more ...
H. E. Mynick, S. E. Parker
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Two-dimensional gyrokinetic turbulence
, 2010 Two-dimensional gyrokinetics is a simple paradigm for the study of kinetic magnetised plasma turbulence. In this paper, we present a comprehensive theoretical framework for this turbulence. We study both the inverse and direct cascades (the ‘dual cascade’
G. G. PLUNK +3 more
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Reduction and approximation in gyrokinetics
, 2008 15 pages latexInternational audienceThe gyrokinetics formulation of plasmas in strong magnetic fields aims at the elimination of the angle associated with the Larmor rotation of charged particles around the magnetic field lines.
Ghendrih, Philippe +2 more
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Astrophysical gyrokinetics: Basic equations and linear theory
, 2016 Magnetohydrodynamic (MHD) turbulence is encountered in a wide variety of astrophysical plasmas, including accretion disks, the solar wind, and the interstellar and intracluster medium.
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Energetic bounds on gyrokinetic instabilities. Part I: Fundamentals
, 2021 Upper bounds on the growth of free energy in gyrokinetics are derived. These bounds apply to all local gyrokinetic instabilities in the geometry of a flux tube, i.e.
Plunk, G. G. +4 more
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Advances in stellarator gyrokinetics [PDF]
Nuclear Fusion, 2015 Recent progress in the gyrokinetic theory of stellarator microinstabilities and turbulence simulations is summarized. The simulations have been carried out using two different gyrokinetic codes, the global particle-in-cell code EUTERPE and the continuum code GENE, which operates in the geometry of a flux tube or a flux surface but is local in the ...
Helander, P. +7 more
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Poloidal tilting symmetry of high order tokamak flux surface shaping in gyrokinetics [PDF]
, 2016 A poloidal tilting symmetry of the local nonlinear δf gyrokinetic model is demonstrated analytically and verified numerically. This symmetry shows that poloidally rotating all the flux surface shaping effects with large poloidal mode number by a single ...
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