Results 1 to 10 of about 410 (182)

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, Gregory G. Howes, Tomoya Tatsuno, Michael Barnes, William Dorland   +4 more
openaire   +3 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   +3 more sources

Stability and transport of gyrokinetic critical pedestals

Nuclear Fusion
A gyrokinetic threshold model for pedestal width–height scaling prediction is applied to multiple devices. A shaping and aspect ratio scan is performed on National Spherical Torus Experiment (NSTX) equilibria, finding $\Delta_{\mathrm{ped}} = 0.92 A^{1 ...
J.F. Parisi, A.O. Nelson, W. Guttenfelder, R. Gaur, J.W. Berkery, S.M. Kaye, K. Barada, C. Clauser, A. Diallo, D.R. Hatch, A. Kleiner, M. Lampert, T. Macwan, J.E. Menard   +13 more
doaj   +3 more sources

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, Ma, Kwan-Liu, Huang, Min-Yu, Klasky, Scott, Ethier, Stephane   +4 more
openaire   +2 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, P. Rodriguez-Fernandez, N.T. Howard, A. Bañón Navarro, R. Bilato, T. Görler, E. Poli, G. Merlo, J. Wright, M. Greenwald, F. Jenko   +10 more
doaj   +1 more source

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., Jenko, F., Pueschel, M. J., Hatch, D. R.   +3 more
openaire   +4 more sources

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, A. Di Siena, J.L. Velasco, F. Wilms, G. Merlo, T. Windisch, L.L. LoDestro, J.B. Parker, F. Jenko   +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, Alejandro Bañón Navarro, Frank Jenko   +2 more
doaj   +1 more source

Gyrokinetic equivalence [PDF]

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

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, Navarro, Alejandro Bañón, Jenko, Frank, Brunner, Stephan, Villard, Laurent   +4 more
openaire   +5 more sources