Abstract
This work concerns the modelling of the Li-like recombination X-ray laser. We have improved the description of the ionization dynamics and the gain production in a recombining laser-produced plasma. The contribution of the Li-like excited levels (up to n=30), which are assumed to follow a quasi-steady state evolution with respect to the ionic populations, is now incorporated in the ionization and recombination rates connecting He-like and Li-like ionic species. Simple expressions for these effective rates are derived. The number of Li-like excited levels to be included in the model, as well as the determination of the lower limit of the thermal band are examined. Predicted 3d-4f gain values (3 cm−1 at λ=154.6 Å) when simulating fibre targets cylindrically illuminated by a short laser pulse are now in good agreement with experiments. Persistent discrepancies in other cases (3d-5f inversion or slab targets) are discussed.
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LULI: National Facility for the Use of Intense Lasers under the CNRS and Ecole Polytechnique, F-91128 Palaiseau, France