Radiation Cooling in Photopumped C VI Inversion,
LEHIGH UNIV BETHLEHEM PA DEPT OF PHYSICS
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Radiation cooling as a means to reach inversion in photoionized C VI is analyzed in the context of energy transfer between excited ions and free electrons. The application of this scheme for the specific case of a hydrogen-like C VI plasma, exposed to the soft x-ray emissions of a titanium-laser-produced plasma was considered. Necessary conditions for the achievement of inversion are a low plasma temperature approx. 10 eV, and a high electron density approx. 10 to the 19thcu. cm. Both are required for the establishment of a strong collisional-recombination regime, favouring the cascading of electrons towards the upper excited levels, leaving the lower levels almost unpopulated. Radiative cooling was originally proposed as a means to reach the desired temperature in similar recombination schemes, however posterior work has shown that his regime was not attainable for low-Z materials. In this paper we consider in detail the hypothesis of radiative cooling for the case of C VI pumped by the Ti-plasma.
- Plasma Physics and Magnetohydrodynamics