Results 21 to 30 of about 410 (182)
Journal of Geophysical Research: Space Physics, Volume 127, Issue 2, February 2022., 2022 Abstract Vlasov solvers that operate on a phase‐space grid are highly accurate but also numerically demanding. Coarse velocity space resolutions, which are largely unproblematic in particle‐in‐cell (PIC) simulations, can lead to numerical heating or oscillations in continuum Vlasov methods.
F. Allmann‐Rahn +2 more
wiley +1 more source
Verification of a fully implicit particle-in-cell method for the v ∥-formalism of electromagnetic gyrokinetics in the XGC code [PDF]
, 2021 A fully implicit particle-in-cell method for handling the v ∥-formalism of electromagnetic gyrokinetics has been implemented in XGC. By choosing the v ∥-formalism, we avoid introducing the nonphysical skin terms in Ampère's law, which are responsible for
Ku, S +10 more
core +1 more source
Van Allen Probes Observations of Symmetric Stormtime Compressional ULF Waves
Journal of Geophysical Research: Space Physics, Volume 127, Issue 2, February 2022., 2022 Abstract Previous spacecraft studies showed that stormtime poloidal ultralow‐frequency (ULF) waves in the ring current region have an antisymmetric (second harmonic) mode structure about the magnetic equator. This paper reports Van Allen Probes observations of symmetric ULF waves in the postnoon sector during a moderate geomagnetic storm.
Kazue Takahashi +8 more
wiley +1 more source
Zonal flow excitation in electron-scale tokamak turbulence
Nuclear Fusion, 2023 The derivation of an intermediate-scale gyrokinetic-electron theory in nonuniform tokamak plasmas (Chen et al 2021 Nucl. Fusion 61 https://doi.org/10.1088/1741-4326/abf81a ) has shown that a Navier–Stokes type nonlinearity couples electron-temperature ...
Stefan Tirkas +4 more
doaj +1 more source
, 2023 Starting from the equations of collisionless linear gyrokinetics for magnetised plasmas with an imposed inhomogeneous magnetic field, we present the first known analytical, closed-form solution for the resulting velocity-space integrals in the presence ...
Ivanov, P. G. +3 more
core +1 more source
Isotope mass dependence of pedestal transport in JET H-mode plasmas
Nuclear Fusion, 2023 We present a comparative transport analysis of the isotope mass dependence in the pedestal of two pairs of deuterium/hydrogen type I ELMy H-mode discharges in JET with ITER-like wall, one characterized by the same input power, the other one by the same ...
I. Predebon +8 more
doaj +1 more source
Nuclear Fusion, 2023 Multi-scale gyrokinetic theory and simulations of a toroidal magnetized plasma have revealed the existence of cross-scale interactions of the trapped electron mode (TEM) and the electron temperature gradient (ETG) turbulence.
T.-H. Watanabe, S. Maeyama, M. Nakata
doaj +1 more source
Transport in gyrokinetic tokamaks [PDF]
Physics of Plasmas, 1995 A comprehensive study of transport in full-volume gyrokinetic (GK) simulations of ion temperature gradient driven turbulence in core tokamak plasmas is presented. Though this ‘‘gyrokinetic tokamak’’ is much simpler than experimental tokamaks, such simplicity is an asset, because a dependable nonlinear transport theory for such systems should be more ...
H. E. Mynick, S. E. Parker
openaire +3 more sources
Quasilinear gyrokinetic theory: a derivation of QuaLiKiz [PDF]
Journal of Plasma Physics, 2021 In order to predict and analyse turbulent transport in tokamaks, it is important to model transport that arises from microinstabilities. For this task, quasilinear codes have been developed that seek to calculate particle, angular momentum and heat fluxes, both quickly and accurately.
C.D. Stephens +5 more
openaire +3 more sources
Theory and modeling of electron fishbones
New Journal of Physics, 2016 Internal kink instabilities exhibiting fishbone like behavior have been observed in a variety of experiments where a high energy electron population, generated by strong auxiliary heating and/or current drive systems, was present. After briefly reviewing
G Vlad +5 more
doaj +1 more source