Results 1 to 10 of about 158 (153)
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
openaire +2 more sources
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
openaire +4 more sources
Predictions of improved confinement in SPARC via energetic particle turbulence stabilization
Nuclear Fusion, 2023 The recent progress in high-temperature superconductor technologies has led to the design and construction of SPARC, a compact tokamak device expected to reach plasma breakeven with up to 25 MW of external ion cyclotron resonant heating (ICRH) power ...
A. Di Siena +10 more
doaj +1 more source
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
openaire +2 more sources
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
openaire +2 more sources
Eigenmode stability analysis of drift-mirror modes in nonuniform plasmas [PDF]
Annales Geophysicae, 2006 Drift-mirror modes in a one-dimensional inhomogeneous model of the magnetosphere are studied by employing gyrokinetics, taking into account finite Larmor radius effects.
D. Yu. Klimushkin, L. Chen, L. Chen
doaj +1 more source
First-principles based plasma profile predictions for optimized stellarators
Nuclear Fusion, 2023 In the present Letter, first-of-its-kind computer simulations predicting plasma profiles for modern optimized stellarators—while self-consistently retaining neoclassical transport, turbulent transport with 3D effects, and external physical sources—are ...
A. Bañón Navarro +8 more
doaj +1 more source
Full-flux-surface effects on electrostatic turbulence in Wendelstein 7-X-like plasmas
Nuclear Fusion, 2023 We present the first nonlinear, gyrokinetic, surface-global simulations of a Wendelstein 7-X-like stellarator with kinetic electrons. As a first application, we investigate the interplay between Ion Temperature Gradient (ITG) and Trapped Electron Mode ...
Felix Wilms +2 more
doaj +1 more source
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
openaire +6 more sources
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
openaire +5 more sources