Abstract
X-ray laser gain of J = 0 → 1 transition (λ = 46.9nm) in collisionally pumped neon (Ne)-like argon (Ar IX) ion has been investigated considering 37 levels of the 2p6, 2p53s, 2p53p, 2p53d, 2s2p63s, 2s2p63p, and 2s2p63d configurations. The effect of radiative trapping of resonance lines on the gain coefficient is studied using a collisional radiative model and a one-dimensional single-fluid, two-temperatures magnetohydrodynamic (MHD) equations. Results indicate that the gain value is significantly affected by the plasma opacity, and the velocity gradient allows us to obtain a higher gain in collisionally pumped Ne-like ions excited in fast capillary-discharged plasmas.
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