Results 11 to 20 of about 464 (190)
Locality and Universality in Gyrokinetic Turbulence [PDF]
Physical Review Letters, 2012 The nature of nonlinear interactions in gyrokinetic turbulence, driven by the ion-temperature gradient instability, is investigated using direct numerical simulations in toroidal flux tube geometry. To account for the level of separation existing between scales involved in an energetic interaction, the degree of locality of the free energy scale flux ...
Teaca, Bogdan +4 more
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Free Energy Cascade in Gyrokinetic Turbulence [PDF]
Physical Review Letters, 2011 In gyrokinetic theory, the quadratic nonlinearity is known to play an important role in the dynamics by redistributing (in a conservative fashion) the free energy between the various active scales. In the present study, the free energy transfer is analyzed for the case of ion temperature gradient driven turbulence.
Banon Navarro, Alejandro +6 more
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Visualizing gyrokinetic simulations [PDF]
IEEE Visualization 2004, 2005 The continuing advancement of plasma science is central to realizing fusion as an inexpensive and safe energy source. Gryokinetic simulations of plasmas are fundamental to the understanding of turbulent transport in fusion plasma. This paper discusses the visualization challenges presented by gyrokinetic simulations using magnetic field line following ...
Crawford, David +4 more
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Gyrokinetic Microtearing Turbulence [PDF]
Physical Review Letters, 2011 The nonlinear dynamics of microtearing modes in standard tokamak plasmas are investigated by means of ab initio gyrokinetic simulations. The saturation levels of the magnetic field fluctuations can be understood in the framework of a balance between (small poloidal wave number) linear drive and small-scale dissipation.
Doerk, H. +3 more
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AstroGK: Astrophysical gyrokinetics code [PDF]
Journal of Computational Physics, 2010 The gyrokinetic simulation code AstroGK is developed to study fundamental aspects of kinetic plasmas and for applications mainly to astrophysical problems. AstroGK is an Eulerian slab code that solves the electromagnetic Gyrokinetic-Maxwell equations in five-dimensional phase space, and is derived from the existing gyrokinetics code GS2 by removing ...
Ryusuke Numata +4 more
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Plasma Physics and Controlled Fusion, 2009 We compare two different derivations of the gyrokinetic equation: the Hamiltonian approach in Dubin D H E et al (1983 Phys. Fluids 26 3524) and the recursive methodology in Parra F I and Catto P J (2008 Plasma Phys. Control. Fusion 50 065014). We prove that both approaches yield the same result at least to second order in a Larmor radius over ...
Parra, F, Catto, P
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An analytical form of the dispersion function for local linear gyrokinetics in a curved magnetic field [PDF]
, 2023 Starting from the equations of collisionless linear gyrokinetics for magnetised plasmas with an imposed inhomogeneous magnetic field, we present the first known analytical, closed-form solution for the resulting velocity-space integrals in the presence ...
Ivanov, P. G., Adkins, T.
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Long time gyrokinetic equations
Quarterly of Applied Mathematics, 2023 The aim of this text is to elucidate the oscillating patterns (see C. Cheverry [Res. Rep. Math. (2018)]) which are generated in a toroidal plasma by a strong external magnetic field and a nonzero electric field. It is also to justify and then study new modulation equations which are valid for longer times than before.
Cheverry, Christophe, Farhat, Shahnaz
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Gyrokinetic large eddy simulations [PDF]
Physics of Plasmas, 2011 The large eddy simulation approach is adapted to the study of plasma microturbulence in a fully three-dimensional gyrokinetic system. Ion temperature gradient driven turbulence is studied with the GENE code for both a standard resolution and a reduced resolution with a model for the sub-grid scale turbulence. A simple dissipative model for representing
Morel, Pierre +6 more
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Nonlinear gyrokinetic equations [PDF]
The Physics of Fluids, 1983 Nonlinear gyrokinetic equations are derived from a systematic Hamiltonian theory. The derivation employs Lie transforms and a noncanonical perturbation theory first used by Littlejohn for the simpler problem of asymptotically small gyroradius. For definiteness, we emphasize the limit of electrostatic fluctuations in slab geometry; however, there is a ...
Dubin, D. H. E. +3 more
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