Zobrazeno 1 - 10
of 228
pro vyhledávání: '"Hammett, G. W."'
Autor:
Bernard, T. N., Halpern, F. D., Francisquez, M., Mandell, N. R., Juno, J., Hammett, G. W., Hakim, A., Wilkie, G., Guterl, J.
We present the first-of-its-kind coupling of a continuum full-f gyrokinetic turbulence model with a 6D continuum model for kinetic neutrals, carried out using the Gkeyll code. Our objective is to improve the first-principles understanding of the role
Externí odkaz:
http://arxiv.org/abs/2202.00811
The effect of varying magnetic shear on scrape-off layer turbulence and profiles is studied via electromagnetic gyrokinetic simulations of a helical scrape-off layer model. We develop a model helical geometry with magnetic shear and a corresponding f
Externí odkaz:
http://arxiv.org/abs/2112.14220
We demonstrate that cross-field transport in the scrape-off layer (SOL) can be moderately increased by electromagnetic effects in high-beta regimes, resulting in a broader electron heat-flux width on the endplates. This conclusion is taken from full-
Externí odkaz:
http://arxiv.org/abs/2112.06880
We present an energy-conserving discontinuous Galerkin scheme for the full-$f$ electromagnetic gyrokinetic system in the long-wavelength limit. We use the symplectic formulation and solve directly for $\partial A_\parallel/\partial t$, the inductive
Externí odkaz:
http://arxiv.org/abs/1908.05653
3D2V continuum gyrokinetic simulations of electrostatic plasma turbulence in a straight, open-field-line geometry have been performed using the full-$f$ discontinuous-Galerkin code Gkeyll. These simulations include the basic elements of a fusion-devi
Externí odkaz:
http://arxiv.org/abs/1702.03052
We are developing a new continuum gyrokinetic code, Gkeyll, for use in edge plasma simulations, and here present initial simulations of turbulence on open field lines with model sheath boundary conditions. The code implements an energy conserving dis
Externí odkaz:
http://arxiv.org/abs/1610.09056
Autor:
Schekochihin, A. A., Parker, J. T., Highcock, E. G., Dellar, P. J., Dorland, W., Hammett, G. W.
Publikováno v:
Journal of Plasma Physics 82, 905820212 (2016)
A scaling theory of long-wavelength electrostatic turbulence in a magnetised, weakly collisional plasma (e.g., ITG turbulence) is proposed, with account taken both of the nonlinear advection of the perturbed particle distribution by fluctuating ExB f
Externí odkaz:
http://arxiv.org/abs/1508.05988
Publikováno v:
Phys. Rev. Lett. 115, 025003, 2015
Nonlinear energy transfer and dissipation in Alfv\'en wave turbulence are analyzed in the first gyrokinetic simulation spanning all scales from the tail of the MHD range to the electron gyroradius scale. For typical solar wind parameters at 1 AU, abo
Externí odkaz:
http://arxiv.org/abs/1505.02204
Publikováno v:
Phys. Plasmas 22, 022504 (2015)
An electrostatic gyrokinetic-based model is applied to simulate parallel plasma transport in the scrape-off layer to a divertor plate. The authors focus on a test problem that has been studied previously, using parameters chosen to model a heat pulse
Externí odkaz:
http://arxiv.org/abs/1409.2520
Some properties of a Local discontinuous Galerkin (LDG) algorithm are demonstrated for the problem of evaluting a second derivative $g = f_{xx}$ for a given $f$. (This is a somewhat unusual problem, but it is useful for understanding the initial tran
Externí odkaz:
http://arxiv.org/abs/1405.5907