Results 121 to 130 of about 464 (190)

Multiscale Simulation of Nonlinear Phenomena of Plasmas

Multiscale hierarchy is intrinsic in collsionless plasmas, where various kinetic effects having their own scales play important roles. Gyrokinetics and the gyrokinetic code AstroGK are introduced to study multiscale phenomena in plasmas.
Nurata, R
core  

Negative triangularity scenarios: from TCV and AUG experiments to DTT predictions

Nuclear Fusion
Experiments, gyrokinetic simulations and transport predictions were performed to investigate if a negative triangularity (NT) L-mode option for the Divertor Tokamak Test (DTT) full-power scenario would perform similarly to the positive triangularity (PT)
A. Mariani, L. Aucone, A. Balestri, P. Mantica, G. Merlo, R. Ambrosino, F. Bagnato, L. Balbinot, J. Ball, T. Bolzonella, D. Brioschi, I. Casiraghi, A. Castaldo, S. Coda, L. Frassinetti, V. Fusco, T. Happel, J. Hobirk, P. Innocente, R.M. McDermott, P. Muscente, T. Pütterich, O. Sauter, F. Sciortino, M. Vallar, B. Vanovac, N. Vianello, G. Vlad, C.F.B. Zimmermann, the EUROfusion Tokamak Exploitation team, the TCV Team, the ASDEX Upgrade Team   +31 more
doaj   +1 more source

Application of the averaging method to the gyrokinetic plasma

Asymptotic Analysis, 2006
We show that the solution to an oscillatory–singularly perturbed ordinary differential equation may be asymptotically expanded into a sum of oscillating terms. Each of those terms writes as an oscillating operator acting on the solution to a nonoscillating ordinary differential equation with an oscillating correction added to it.
openaire   +3 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.
Hallenbert, A., Abel, Ian, I. G. Abel, A. Hallenbert, Abel, Ian,, Hallenbert, A.,   +5 more
core   +1 more source

Influence of the density gradient on turbulent heat transport at ion-scales: an inter-machine study with the gyrokinetic code stella

Nuclear Fusion
Efficient control of turbulent heat transport is crucial for magnetic confinement fusion reactors. This work discusses the complex interplay between density gradients and microinstabilities, shedding light on their impact on turbulent heat transport in ...
H. Thienpondt, J.M. García-Regaña, I. Calvo, G. Acton, M. Barnes   +4 more
doaj   +1 more source

Assessing the impact of alpha particles on thermal confinement in JET D-T plasmas through global GENE-Tango simulations

Nuclear Fusion
The capability of the global, electromagnetic gyrokinetic GENE code interfaced with the transport Tango solver is exploited to address the impact of fusion alpha particles (in their dual role of fast particles and heating source) on plasma profiles and ...
A. Di Siena, J. Garcia, R. Bilato, K. Kirov, J. Varela, A. Bañón Navarro, Hyun-Tae Kim, C. Challis, J. Hobirk, A. Kappatou, E. Lerche, D. Spong, C. Angioni, T. Görler, E. Poli, M. Bergmann, F. Jenko, JET contributors   +17 more
doaj   +1 more source

Gyrokinetic limitations and improvements

, 2016
For a tokamak, we consider gyrokinetic quasineutrality limitations when evaluating the axisymmetric radial electric field; a gyrokinetic entropy production restriction on the ion temperature pedestal; and a hybrid gyrokinetic-fluid treatment valid on transport time scales.
Catto, P, Parra, F, Kagan, G, Simakov, A
openaire   +1 more source

Gyrokinetic theory for particle and energy transport in fusion plasmas

, 2018
A set of equations is derived describing the macroscopic transport of particles and energy in a thermonuclear plasma on the energy confinement time.
Fulvio Zonca, Falessi, M.V., Zonca, F., Matteo Valerio Falessi   +3 more
core   +1 more source

Simulations of edge and SOL turbulence in diverted negative and positive triangularity plasmas

Nuclear Fusion
Optimizing the performance of magnetic confinement fusion devices is critical to achieving an attractive fusion reactor design. Negative triangularity (NT) scenarios have been shown to achieve excellent levels of energy confinement, while avoiding edge ...
P. Ulbl, A. Stegmeir, D. Told, G. Merlo, K. Zhang, F. Jenko   +5 more
doaj   +1 more source

Hamiltonian reductions in plasma physics about intrinsic gyrokinetics

, 2013
La gyrocinétique est un modèle clef pour la microturbulence en physique des plasmas. Elle présente encore plusieurs difficultés, qui pourraient invalider ses équations. Ce rapport de thèse clarifie trois d'entre elles.
De guillebon de resnes, Loic
core