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Kinetic transport model for the ELMO Bumpy Torus

Authors: Jaeger, E. F.; Hedrick, C. L.; Tolliver, J. S.;

Kinetic transport model for the ELMO Bumpy Torus

Abstract

A bounce-averaged drift kinetic equation is solved for the toroidal plasma in the ELMO Bumpy Torus (EBT). The distribution function is assumed isotropic in pitch angle and calculated as a function of radius and speed using finite differences on a two-dimensional grid. A Fokker-Planck representation of the collision operator includes Coulomb, microwave, ionizing, and charge-exchange collisions. Ion and electron fluxes, computed as integrals of the distribution function, are of comparable magnitude for ambipolar potentials which are approximately self-consistent. Initial results assume an unperturbed distribution function which is Maxwellian; however, this is not a necessary assumption in the model. Careful accounting of loss regions where electric and magnetic poloidal drifts cancel (super banana particle orbits) leads to ion loss rates which are in some cases two orders of magnitude greater than electron rates. In these cases, radially inward pointing self-consistent electric fields occur with potentials on the order of a few times the ion temperature. These negative field results are in approximate agreement with experiment and appear to be stable to the electric field runaway encountered in positive field cases.

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United States
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Keywords

Distribution Functions, Equations, Basic Interactions, Interactions, Scattering, Charge Exchange, Plasma, Fokker-Planck Equation, Energy Losses, Radiations, Radiation Transport, Differential Equations, Microwave Radiation, Thermonuclear Devices 700105* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Theoretical-- (-1987), Open Plasma Devices, Kinetic Equations, Electromagnetic Radiation, Electromagnetic Interactions, Elastic Scattering, Elmo Bumpy Torus, Coulomb Scattering, Elmo Devices, 70 Plasma Physics And Fusion Technology, Magnetic Mirrors, Charged-Particle Transport

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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