Physics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975phys...12..327l&link_type=abstract
Physica Scripta, vol. 12, Dec. 1975, p. 327-336.
Physics
15
Heat Balance, Magnetic Control, Neutral Particles, Plasma Control, Equilibrium Equations, High Temperature Plasmas, Magnetohydrodynamic Stability, Permeability, Plasma Density, Pressure Effects, Quasi-Steady States, Spatial Distribution, Temperature Distribution
Scientific paper
The equilibrium state of hot magnetically confined 'permeable' plasmas penetrated by neutral gas is analyzed. Consideration is limited to steady or quasi-steady plasmas. The heat balance equation for the plasma is derived from previously defined (Lehnert, 1968) expressions for the particle and momentum balance. The neutral gas consists of a slow component originating from the cool wall regions and not yet warmed by the plasma, and a fast component which has been subject to thermalizing collisions. Macroscopic fluid theory is applied to describe the behavior of both components in a first approximation. On the basis of the subsequent analysis hot plasmas are subdivided into classes of permeable dilute, permeable nondilute, and impermeable systems differing in their equilibrium and stability properties according to the relative concentrations, spatial distributions, and transport processes of the gas. The spatial distribution of the gas and the ionization rate affect the pressure distribution and relaxation times of the plasmas. The density of the gas immersed in a quasi-steady plasma is a measure of the particle loss rate.
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