Results 81 to 90 of about 154 (149)

Electron heating in kinetic-Alfvén-wave turbulence. [PDF]

Proc Natl Acad Sci U S A, 2023
Zhou M, Liu Z, Loureiro NF.
europepmc   +1 more source

Destabilization of geodesic acoustic-like mode in the presence of poloidally inhomogeneous heat sources in tokamak plasmas

Nuclear Fusion
The effects of poloidally inhomogeneous heat sources are investigated through a gyrokinetic formula in collisionless toroidal plasmas. A gyrokinetic dispersion relation is newly derived under the assumption that equilibrium parallel heat flows are ...
Young-Hoon Lee, Jungpyo Lee
doaj   +1 more source

Gyrokinetic simulation of microtearing turbulence

, 2013
In modern fusion experiments, plasma turbulence is responsible for the radial heat transport and thus determines the plasma confinement within the magnetic field of tokamak devices. Deeper theoretical understanding is still needed and the detailed physical picture continues to evolve.
openaire   +3 more sources

Impact of supra-thermal particles on plasma performance at ASDEX Upgrade with GENE-Tango simulations

Nuclear Fusion
This paper presents global gyrokinetic simulations on the transport time scale of an ASDEX Upgrade H-mode discharge showing a pronounced peaking of the on-axis ion temperature profiles.
A. Di Siena, R. Bilato, A. Bañón Navarro, M. Bergmann, L. Leppin, T. Görler, E. Poli, M. Weiland, G. Tardini, F. Jenko, the ASDEX Upgrade Team, the EUROfusion MST1 Team   +11 more
doaj   +1 more source

The impact of E × B shear on microtearing based transport in spherical tokamaks

Nuclear Fusion
Electromagnetic microtearing modes (MTMs) have been observed in many different spherical tokamak (ST) regimes. Understanding how these and other electromagnetic modes nonlinearly saturate is likely critical in understanding the confinement of a high β ST.
B.S. Patel, M.R. Hardman, D. Kennedy, M. Giacomin, D. Dickinson, C.M. Roach   +5 more
doaj   +1 more source

Laboratory measurements of the physics of auroral electron acceleration by Alfvén waves. [PDF]

Nat Commun, 2021
Schroeder JWR, Howes GG, Kletzing CA, Skiff F, Carter TA, Vincena S, Dorfman S.   +6 more
europepmc   +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

Multiscale gyrokinetics for rotating tokamak plasmas: II. Reduced models for electron dynamics

New Journal of Physics, 2013
In this paper, we extend the multiscale approach developed in Abel et al (2012 Rep. Prog. Phys. submitted) by exploiting the scale separation between ions and the electrons. The gyrokinetic equation is expanded in powers of the electron to ion mass ratio,
I G Abel, S C Cowley
doaj   +1 more source

Gyrokinetic field theory

Physics of Plasmas, 2000
The Lagrangian formulation of the gyrokinetic theory is generalized in order to describe the particles’ dynamics, as well as the self-consistent behavior of the electromagnetic fields. The gyrokinetic equation for the particle distribution function and the gyrokinetic Maxwell’s equations, for the electromagnetic fields, are both derived from the ...
openaire   +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