Results 91 to 100 of about 464 (190)

Enhancing predictive capabilities in fusion burning plasmas through surrogate-based optimization in core transport solvers

Nuclear Fusion
This work presents the PORTALS framework (Rodriguez-Fernandez et al 2022 Nucl. Fusion 62 076036), which leverages surrogate modeling and optimization techniques to enable the prediction of core plasma profiles and performance with nonlinear gyrokinetic ...
P. Rodriguez-Fernandez, N.T. Howard, A. Saltzman, S. Kantamneni, J. Candy, C. Holland, M. Balandat, S. Ament, A.E. White   +8 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

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

Nonequilibrium gyrokinetic fluctuation theory and sampling noise in gyrokinetic particle-in-cell simulations [PDF]

Physics of Plasmas, 2007
The present state of the theory of fluctuations in gyrokinetic (GK) plasmas and especially its application to sampling noise in GK particle-in-cell (PIC) simulations is reviewed. Topics addressed include the Δf method, the fluctuation-dissipation theorem for both classical and GK many-body plasmas, the Klimontovich formalism, sampling noise in PIC ...
openaire   +1 more source

Multiscale Simulation of Nonlinear Phenomena of Plasmas

, 2012
1.Introduction 2.Gyrokinetics and AstroGK 3.Magnetic reconnection as an example of multiscale phenomena 4.SummaryCollaborate Research Meeting of Institute of Mathematics for Industry & MEXT collaborative workshop of mathematics and mathematical sciences ...
Nurata, R
core  

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

Multiscale Modelling of Large-Amplitude Fluctuations in Tokamak Edge Plasmas [PDF]

, 2018
For the efficient and safe operation of magnetic confinement fusion reactors, reliable theoretical descriptions of the dynamic behaviour of the confined plasma are required. One proven, highly successful description is gyrokinetics, which describes small
Hallenbert, Axel
core  

Kinetic-ballooning-limited pedestals in spherical tokamak plasmas

Nuclear Fusion
A theoretical model is presented that for the first time matches experimental measurements of the pedestal width-height Diallo scaling in the low-aspect-ratio high- β tokamak NSTX.
J.F. Parisi, W. Guttenfelder, A.O. Nelson, R. Gaur, A. Kleiner, M. Lampert, G. Avdeeva, J.W. Berkery, C. Clauser, M. Curie, A. Diallo, W. Dorland, S.M. Kaye, J. McClenaghan, F.I. Parra   +14 more
doaj   +1 more source

Advanced visualization workflows for gyrokinetics simulation data

Frontiers in Physics
Gyrokinetic simulations are central to the study of turbulent transport in magnetized fusion plasmas, but their output remains difficult to visualize because the data are complex and must be transformed into real space.
Rui Costa, William Hornsby, Daniel Kennedy, Lorenzo Zanisi, Nitesh Bhatia, Stanislas J. P. Pamela, Alejandra N. Gonzalez-Beltran, Robert Akers   +7 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