Gyrofluid simulations of collisionless reconnection in the presence of diamagnetic effects

Tassi, Emanuele; Waelbroeck, F. L.; Grasso, D.

doi:10.1088/1742-6596/260/1/012020

Cited by 10 publications

(17 citation statements)

References 40 publications

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“…These moderate deviations are in line with quantitatively similar differences between the model and the fluid simulation results reported in Ref. 27 where they are attributed to the limitations of the theory. In particular, the sign is the same, corresponding to gradient-induced stabilization.…”

Section: Pressure Gradientssupporting

confidence: 89%

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Gyrokinetic simulations of magnetic reconnection

et al. 2011

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Fast magnetic reconnection, believed to be a mechanism for rearranging the magnetic topology and creating energetic particles in many astrophysical and laboratory plasmas, is investigated with the nonlinear gyrokinetic code GENE. After some code-code benchmarking, extensive linear studies are presented, covering all relevant parameter dependencies of two-dimensional slab reconnection. The results are used to ascertain the validity of a fluid model and understand for which parameters it fails to describe the physics correctly. The nonlinear phase is studied for two scenarios: decaying and driven turbulence. In the former case, the initially injected energy is cascading towards the largest scales of the system, whereas a fully turbulent, quasi-stationary state develops if the system is driven through a Krook-type term in the gyrokinetic Vlasov equation.

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Section: Pressure Gradientssupporting

confidence: 89%

“…27 is based on fluid model investigations of the influence of (radial) background density gradients on the reconnection rate. It is generally found that such gradients induce drifts which, in turn, suppress reconnection modes.…”

Section: Pressure Gradientsmentioning

confidence: 99%

Gyrokinetic simulations of magnetic reconnection

et al. 2011

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“…In the low-collisionality regime of the DIII-D experiments, however, the resonant layers are narrower than the Larmor radius. Several studies of tearing and resistive kink growth rates have shown, however, that in the linear regime, the FLR assumption yields results in good agreement with calculations that account for the nonlocal nature of ion gyration (see [70,71] and references therein). Of greater consequence is the neglect of neoclassical effects and electron heat transport.…”

Section: Formulationmentioning

confidence: 55%

Role of singular layers in the plasma response to resonant magnetic perturbations

et al. 2012

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Abstract. The response of an H-mode plasma to magnetic perturbations that are resonant in the edge is evaluated using a fluid model. With two exceptions, the plasma rotation suppresses the formation of magnetic islands, holding their widths to less than a tenth of those predicted by the vacuum approximation. The two exceptions are at the foot of the pedestal, where the plasma becomes more resistive, and at the surface where the perpendicular component of the electron velocity reverses. The perturbations exert a force on the plasma that is such as to brake the perpendicular component of the electron rotation. In the pedestal, the corresponding Maxwell stress drives the radial electric field in such a way as to accelerate ion rotation. Despite the suppression of the islands, the perturbations give rise to particle fluxes caused by magnetic flutter, with a negligible contribution from E×B convection. In the pedestal, the fluxes are such as to reduce the density.

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“…However, the effect of finite electron mass will certainly be significant for application of our model to weakly collisional or pure collisionless regimes of the drift-tearing instability. In the latter case, for example, the Hamiltonian form of the equations was shown to be effective for studying the diamagnetic effects on collisionless magnetic reconnection [13]. The ion velocity is associated with the fluid velocity (center-of-mass velocity),…”

Section: Two-fluid Mhd Modelmentioning

confidence: 99%

Analytical and numerical treatment of resistive drift instability in a plasma slab

et al. 2016

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An analytic approach combining the effect of equilibrium diamagnetic flows and the finite ionsound gyroradius associated with electron−ion decoupling and kinetic Alfvén wave dispersion is derived to study resistive drift instabilities in a plasma slab. Linear numerical computations using the NIMROD code are performed with cold ions and hot electrons in a plasma slab with a doubly periodic box bounded by two perfectly conducting walls. A linearly unstable resistive drift mode is observed in computations with a growth rate that is consistent with the analytic dispersion relation. The resistive drift mode is expected to be suppressed by magnetic shear in unbounded domains, but the mode is observed in numerical computations with and without magnetic shear. In the slab model, the finite slab thickness and the perfectly conducting boundary conditions are likely to account for the lack of suppression.

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Gyrofluid simulations of collisionless reconnection in the presence of diamagnetic effects

Cited by 10 publications

References 40 publications

Gyrokinetic simulations of magnetic reconnection

Gyrokinetic simulations of magnetic reconnection

Role of singular layers in the plasma response to resonant magnetic perturbations

Analytical and numerical treatment of resistive drift instability in a plasma slab

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