NDLI: Quasineutral Particle/Fluid Hybrid Simulation Technique for Whistlers

Content Provider	IEEE Xplore Digital Library
Author	Lampe, M. Ganguli, G. Joyce, G. Manheimer, W. Streltsov, A.
Copyright Year	2005
Description	Author affiliation: Div. of Plasma Phys., Naval Res. Lab., Washington, DC (Lampe, M.; Ganguli, G.)
Abstract	Summary form only given. We have developed a new simulation scheme for whistlers and other slow EM waves which is fully kinetic and fully nonlinear, works in homogeneous or inhomogeneous situations, is not restricted to a single coherent mode, eliminates the speed-of-light time scale and the electron plasma oscillation time scale, and concentrates simulation resources on the parts of the electron distribution that make kinetic contributions to wave growth. The elements of the scheme are as follows. (1) The plasma is represented as a cold fluid plus a set of simulation particles. The simulation particles can be chosen to represent any part of the electron velocity distribution that is of kinetic interest, e.g. the complete ensemble of energetic electrons, or only a set of resonant electrons. (2) Quasineutrality (QN) is assumed, i.e. div J=0. We emphasize that this does not mean that there are no electrostatic fields, only that the electric field E is determined by QN, rather than by Poisson's equation. This assumption is appropriate when the frequencies are slow compared to the plasma frequency, and it eliminates plasma oscillations. (3) The displacement current is neglected, since the waves of interest are slow compared to c. This is similar to the Darwin model. However, (1) and (2) allow us to neglect the fall displacement current, not just the solenoidal part, and thereby avoid all of the complications of the Darwin model. (4) Faraday's and Ampere's laws, rather than a momentum conservation equation, are used to push the cold fluid velocity. This guarantees QN. (5) The simulation particles are pushed in standard PIC fashion. (6) The magnetic field is determined by Ampere's law. In the linear regime, the scheme reproduces the quasi-longitudinal dispersion relation for whistlers, and is accurate for propagation angles up to the resonance cone. An extremely stable and accurate predictor-corrector scheme is used, and energy is conserved to great accuracy. The code need not resolve spatial scales smaller than the wavelengths of interest, nor time scales shorter than the gyrofrequency. We have used the code to study long-time nonlinear evolution of whistler instabilities; results will be shown for a variety of situations
Sponsorship	Plasma Sci. Appl. Comm. IEEE Nucl. Plasma Sci. Soc.
Starting Page	246
Ending Page	246
File Size	1358777
Page Count	1
File Format	PDF
ISBN	0780393007
ISSN	07309244
DOI	10.1109/PLASMA.2005.359319
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Plasma simulation Electrons Plasma waves Kinetic theory Frequency Resonance Electrostatics Poisson equations Magnetic fields Dispersion
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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