Fluid Models for Tokamak Plasmas.
NAVAL RESEARCH LAB WASHINGTON D C
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The Tokamak system is a toroidal electromagnetic field plasma configuration in which the magnetic field ratio B sub zB sub theta is large. This toroidal configuration, which is one of the simpler magnetic confinement geometries, has led to relatively high plasma temperatures, densities, and containment times. The growing amount of experimental data, which needs to be explained, reveals the need for complicated theoretical plasma models similar to those which have been applied to pinch plasmas over the past several years. It does not seem possible to explain the experimental data by using the present two-fluid model applying the usual classical transport coefficients. Two major model expansions are obvious a increase the number of fluids in the model, and b take into account as many spatial dimensions as possible. A fluid model that includes neutrals, electrons, and ions with arbitrary charge Z is derived. Cylindrical symmetry is imposed, although the transport coefficients include corrections for toroidal geometry. Assumptions are discussed under which this model can be applied to describe a Tokamak plasma consisting of neutral hydrogen, protons, electrons, and nine ionization stages of oxygen impurities. Author
- Plasma Physics and Magnetohydrodynamics