Results 81 to 90 of about 464 (190)

GKFieldFlow: a spatio-temporal neural surrogate for nonlinear gyrokinetic turbulence

Nuclear Fusion
We present GKFieldFlow , a novel three-dimensional autoregressive deep learning surrogate model for the saturated state of nonlinear gyrokinetic (GK) turbulence.
Arash Ashourvan
doaj   +1 more source

Drift-compression waves propagating in the direction of energetic electron drift in the magnetosphere

, 2017
As shown within the limits of gyrokinetics, drift-compression waves can propagate in the magnetosphere in the direction of energetic electron drift.
Danila Kostarev, Павел Магер, Pavel Mager, Данила Костарев   +3 more
core   +1 more source

Near-edge beta induced Alfven eigenmode in DIII-D high bootstrap current fraction plasmas

Nuclear Fusion
In DIII-D high bootstrap current fraction plasmas heated solely by neutral beam injection, a fast ion-driven Beta-Induced Alfven Eigenmode (BAE) is frequently observed.
X. Jian, C. Holland, V. Chan, Z. Qiu, E. Bass, S. Ding, X. Du, Y. Zou, A. Garofalo, G. Yu, J. McClenaghan   +10 more
doaj   +1 more source

Understanding turbulence suppression in JET D–T plasma with highly energetic fast ions via global gyrokinetic GENE simulations

Nuclear Fusion
This study focuses on understanding how turbulence is suppressed in particularly heated JET plasma discharges showing enhanced confinement, namely $99896$ , which uses a nearly 50–50 deuterium–tritium mixture, showing signs of enhanced plasma confinement.
A. Di Siena, J. Garcia, G. Merlo, A. Bañón Navarro, F. Sheffield, E. Poli, A. Ishizawa, Ye.O. Kazakov, J. Varela, T. Görler, F. Jenko, JET Contributors, the EUROfusion Tokamak Exploitation Team   +12 more
doaj   +1 more source

Gyrokinetic microturbulence in transport barriers

, 2012
Modern fusion research aims at making the energy source of the sun accessible for electricity generation on earth. For this purpose, magnetically confined plasmas must be heated to very high temperatures of 100 million Kelvin. The resulting steep pressure gradients lead to turbulent mixing in the plasma, causing a drastic deterioration of particle and ...
openaire   +3 more sources

Fundamental form of the electrostatic δf-PIC algorithm and discovery of a converged numerical instability [PDF]

, 2016
The δf particle-in-cell algorithm has been a useful tool in studying the physics of plasmas, particularly turbulent magnetized plasmas in the context of gyrokinetics.
William Dorland, Dorland, W, Dorland, William D., George J. Wilkie, Wilkie, George,, Wilkie, George, Dorland, William D.,   +6 more
core   +1 more source

Dispersion relation for gauge-free electromagnetic drift kinetics

, 2021
Publisher Copyright: © 2021 Author(s).Recently, a new approach to gyrokinetics, invariant under electromagnetic gauge transformations, was developed. The gyrocenter equations of motion are now expressed in terms of the perturbed fields instead of the ...
Chang Liu, Filippo Zonta, Riccardo Iorio, Eero Hirvijoki, Burby, Joshua W., Hirvijoki, Eero, Joshua W. Burby, Zonta, Filippo, Iorio, Riccardo, Liu, Chang, Iorio, Riccardo Nicolò   +10 more
core   +1 more source

Multiscale turbulence in stellarators

Nuclear Fusion
We present the first gyrokinetic simulations of multiscale turbulence in a stellarator, using the magnetic geometry of Wendelstein 7-X (W7-X) and experimentally relevant parameters. A broad range of scenarios is explored, including regimes where electron-
G. Merlo, A. Bañón Navarro, T. Görler, F. Jenko, F. Wilms   +4 more
doaj   +1 more source

Towards fully predictive gyrokinetic full-f simulations: validation and triangularity studies in TCV

Nuclear Fusion
Designing economical magnetic confinement fusion power plants motivates computational tools that can estimate plasma behavior from engineering parameters without direct reliance on experimental measurement of the plasma profiles. In this work, we present
A.C.D. Hoffmann, T.N. Bernard, M. Francisquez, G.W. Hammett, A. Hakim, J. Boedo, R. Rizkallah, C.K. Tsui, The TCV Team   +8 more
doaj   +1 more source

Gyrokinetic linearized Landau collision operator [PDF]

Physical Review E, 2013
The full gyrokinetic electrostatic linearized Landau collision operator is calculated including the equilibrium operator, which represents the effect of collisions between gyrokinetic Maxwellian particles. First, the equilibrium operator describes energy exchange between different plasma species, which is important in multiple ion-species plasmas ...
openaire   +3 more sources