Results 41 to 50 of about 1,247 (174)

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, Morel, Pierre, Albrecht-Marc, Michel, Carati, Daniele, Merz, Florian, Görler, Tobias, Jenko, Frank   +6 more
openaire   +5 more sources

Multiscale Modelling for Tokamak Pedestals

, 2018
Pedestal modelling is crucial to predict the performance of future fusion devices. Current modelling efforts suffer either from a lack of kinetic physics, or an excess of computational complexity.
Abel, Ian, Hallenbert, Axel
core   +1 more source

Fourier-Hermite spectral representation for the Vlasov-Poisson system in the weakly collisional limit

, 2014
We study Landau damping in the 1+1D Vlasov-Poisson system using a Fourier-Hermite spectral representation. We describe the propagation of free energy in phase space using forwards and backwards propagating Hermite modes recently developed for ...
Dellar, P. J., Parker, J. T.
core   +1 more source

Validity of gyrokinetic theory in magnetized plasmas

Communications Physics
Gyrokinetics, as a reduced kinetic theory derived from adiabaticity, provides a general framework for the long-term dynamics of magnetized plasmas. While its validity limits are stated in terms of formal expansion parameters, more quantitative test of ...
Haotian Chen, Liu Chen, Fulvio Zonca, Jiquan Li, Min Xu   +4 more
doaj   +1 more source

Collisionless Reconnection in the Large Guide Field Regime: Gyrokinetic Versus Particle-in-Cell Simulations

, 2014
Results of the first validation of large guide field, $B_g / \delta B_0 \gg 1$, gyrokinetic simulations of magnetic reconnection at a fusion and solar corona relevant $\beta_i = 0.01$ and solar wind relevant $\beta_i = 1$ are presented, where $\delta B_0$
Daughton, W., Dorland, W., Howes, G. G., Karimabadi, H., TenBarge, J. M.   +4 more
core   +1 more source

Edge Fluid Turbulence Simulations of Stellarators With GRILLIX

Contributions to Plasma Physics, EarlyView.
ABSTRACT The edge fluid turbulence code GRILLIX has recently been extended from axisymmetric tokamak geometries to support 3D stellarator configurations. Following successful proof‐of‐principle simulations published in Stegmeir et al., we present here a comprehensive simulation of the Wendelstein 7‐AS stellarator.
Andreas Stegmeir, Christoph Pitzal, Barnabas Csillag, Miguel Madeira, Marion Finkbeiner   +4 more
wiley   +1 more source

Special issue: Machine learning methods in plasma physics

, 2023
Contributions to Plasma Physics, Volume 63, Issue 5-6, June-July 2023.
wiley   +1 more source

Experimental study and gyrokinetic simulations of isotope effects on core heat transport in JET tokamak deuterium and tritium plasmas

Nuclear Fusion
This paper presents a study on the dependence of the ion temperature stiffness on the plasma main ion isotope mass in JET ITER-like wall and C wall discharges.
D. Brioschi, P. Mantica, A. Mariani, N. Bonanomi, E. Delabie, J. Garcia, N. Hawkes, I. Jepu, D. Keeling, E. Lerche, E. Litherland-Smith, C.F. Maggi, S. Menmuir, G. Szepesi, D. Taylor, D. Van Eester, JET Contributors   +16 more
doaj   +1 more source

Cascades and Dissipative Anomalies in Nearly Collisionless Plasma Turbulence

, 2018
We develop first-principles theory of kinetic plasma turbulence governed by the Vlasov-Maxwell-Landau equations in the limit of vanishing collision rates.
Eyink, Gregory L.
core   +1 more source

Nonlinear Gyrokinetic Simulation of the Magnetosphere‐Ionosphere Feedback Coupling

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract A nonlinear gyrokinetic simulation is applied to the magnetosphere‐ionosphere (M‐I) coupling system to investigate spontaneous growth of auroral structures and electron acceleration self‐consistently. Perturbations of electron density, potential and field‐aligned current in the auroral ionosphere develop through the feedback instability ...
T.‐H. Watanabe, K. Fujita, S. Maeyama
wiley   +1 more source