Results 91 to 100 of about 1,247 (174)

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

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

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

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

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

Generalized Covariant Gyrokinetic Dynamics of Magnetoplasmas

AIP Conference Proceedings, 2008
A basic prerequisite for the investigation of relativistic astrophysical magnetoplasmas, occurring typically in the vicinity of massive stellar objects (black holes, neutron stars, active galactic nuclei, etc.), is the accurate description of single-particle covariant dynamics, based on gyrokinetic theory (Beklemishev et al.,1999-2005).
C. Cremaschini, M. Tessarotto, P. Nicolini, A. Beklemishev, Takashi Abe   +4 more
openaire   +3 more sources

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

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

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