Highly ionised heavy ion plasmas

Details Highly ionised heavy ion plasmas Highly ionised heavy ion plasmas

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..703...66c&link_type=abstract

PLASMAS IN THE LABORATORY AND IN THE UNIVERSE: New Insights and New Challenges. AIP Conference Proceedings, Volume 703, pp. 66-

Astronomy and Astrophysics

Astrophysics

Ionization Of Plasmas, Multicomponent And Negative-Ion Plasmas

Scientific paper

The charge state distribution (CSD) of multiply ionised optically thin plasmas may deviate greatly from thermal equilibrium, so that rate equations and their approximate analytical solutions are necessary to classify different CSDs. Thermal equilibrium is compared with several cases ranging from the case of well confined ions (similar to coronal plasma) to broader CSDs, typical of laboratory plasmas, in particular ion sources, where ion confinement time τ0 and/or electron density ne is poor; electron temperature is limited to a few keV. After discussing updated ionisation rates [Arnaud and Raymond, Astrophys. Jour., 391, 394 (1992)], a new solution for the CSD is worked out in term of the parameter x = τ0ne/nτcr, which reduces to a double exponential distribution named li-de for x --> 0 and to a corona equilibrium for x --> ∞ for x ≅ 1 a CSD sharper than li-de is found.

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