Statistics – Computation
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000rmxac...9..131m&link_type=abstract
"Astrophysical Plasmas: Codes, Models, and Observations, Proceedings of the conference held in Mexico City, October 25-29, 1999,
Statistics
Computation
Scientific paper
The theory of radiative impurities in hydrogen plasmas is applied to edge and divertor plasmas in thermonuclear devices, as well as to interstellar and intergalactic clouds, stellar atmospheres and solar prominences. Radiative impurities are able to qualitatively change the plasma dynamics. The lead to the appearance of new types of equilibria, linear and nonlinear waves, and change significantly the stability criteria. For full impurity descriptions one needs an extremely cumbersome set of equations describing each ionization state separately. It is shown that it is possible to describe light impurities with acceptable accuracy by using only two or three representative ionization states. It is shown that a five ionization state description may be reduced to a three ionization state one. Reduced models for light impurities and strongly ionized heavy impurities in coronal hydrogen plasmas are proposed. These hold out the possibility of getting analytical results in many cases, as well as to significantly reducing computation times. A simple set of equations determining dynamics of impurity distributions over ionization states is derived.
Gervids V. I.
Morozov Kh. D.
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