Results 111 to 120 of about 464 (190)

Lifting particle coordinate changes of magnetic moment type to Vlasov-Maxwell Hamiltonian dynamics

, 2013
International audienceTechniques for coordinate changes that depend on both dependent and independent variables are developed and applied to the Maxwell-Vlasov Hamiltonian theory.
Morrison, Philip, Vittot, Michel, de Guillebon, Loïc   +2 more
core   +1 more source

Prediction of performance and turbulence in ITER burning plasmas via nonlinear gyrokinetic profile prediction

Nuclear Fusion
Burning plasma performance, transport, and the effect of hydrogen isotope (H, D, D-T fuel mix) on confinement has been predicted for ITER baseline scenario (IBS) conditions using nonlinear gyrokinetic profile predictions.
N.T. Howard, P. Rodriguez-Fernandez, C. Holland, J. Candy   +3 more
doaj   +1 more source

Transport Barriers in magnetized plasmas- general theory with dynamical constraints

Nuclear Fusion
A fundamental dynamical constraint—that fluctuation induced charge-weighted particle flux must vanish- can prevent instabilities from accessing the free energy in the strong gradients characteristic of Transport Barriers (TBs).
M. Kotschenreuther, X. Liu, S.M. Mahajan, D.R. Hatch, G. Merlo   +4 more
doaj   +1 more source

Conductivity Tensor for Anisotropic Plasma in Gyrokinetic Theory

, 2017
It has been argued that oblique firehose and mirror instabilities are important candidates for the regulation of temperature anisotropy in solar wind. To quantify the role of anisotropy driven instabilities, global kinetic simulations of the solar wind ...
Johnson, Jay R., Peter Porazik, Jay R. Johnson, Porazik, Peter   +3 more
core   +1 more source

On the importance of parallel magnetic-field fluctuations for electromagnetic instabilities in STEP

Nuclear Fusion
This paper discusses the importance of parallel perturbations of the magnetic-field in gyrokinetic simulations of electromagnetic instabilities and turbulence at mid-radius in the burning plasma phase of the conceptual high- β , reactor-scale, tight ...
D. Kennedy, C.M. Roach, M. Giacomin, P.G. Ivanov, T. Adkins, F. Sheffield, T. Görler, A. Bokshi, D. Dickinson, H.G. Dudding, B.S. Patel   +10 more
doaj   +1 more source

Fully Kinetic Simulation of Ion-Temperature-Gradient Instabilities in Tokamaks

, 2018
The feasibility of using full ion kinetics, instead of gyrokinetics, in simulating low-frequency Ion-Temperature-Gradient (ITG) instabilities in tokamaks has recently been demonstrated.
Youjun Hu, Scott Parker, Yang Chen, Matthew Miecnikowski   +3 more
core   +1 more source

Turbulent Multiscale Interactions between Tearing Modes, Trapped-Electron Modes, and Zonal Flows

Interactions between MHD-scale tearing modes (TMs) and ion-gyroradius-scale trapped-electron modes (TEMs) in a fusion plasma are simulated with global gyrokinetics, using a consistent set of fixed equilibrium profiles.
Jitsuk, T., Pueschel, M.J., Terry, P.W., Di Siena, A.   +3 more
core   +1 more source

iGENE: A differentiable flux-tube gyrokinetic code in TensorFlow

We present iGENE, a fully-differentiable TensorFlow implementation of the electromagnetic local non-linear gyrokinetic model, which allows us to compute gradients of any simulation output with respect to any input via automatic differentiation.
F. Jenko, V. Artigues, G. Merlo
core   +1 more source

Kinetic plasma-wall interaction using immersed boundary conditions

Nuclear Fusion
The interaction between a plasma and a solid surface is studied in a (1D-1V) kinetic approach using immersed boundary conditions and penalization to model the wall.
Yann Munschy, Emily Bourne, Guilhem Dif-Pradalier, Peter Donnel, Philippe Ghendrih, Virginie Grandgirard, Yanick Sarazin   +6 more
doaj   +1 more source

Overview of multiscale turbulence studies covering ion-to-electron scales in magnetically confined fusion plasma

Nuclear Fusion
Turbulent transport in magnetically confined fusion plasma has conventionally been analyzed at the ion gyroradius scale based on the microturbulence theory.
S. Maeyama, N.T. Howard, J. Citrin, T.-H. Watanabe, T. Tokuzawa   +4 more
doaj   +1 more source