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Toward Shorter Wavelengths For Soft X-Ray Lasers Based On Li-Like Ions

We present recent experiments on soft x-ray amplification in lithium-like ions in a CO2 laser-produced recombining plasma confined in a magnetic field. The maximum gain-length products observed are GL = 3 - 4 for the 154 A, 4f - 3d transition in Al XI and GL = 1 - 2 for the 129 A, 4f-3d transition in Si XII, respectively. A one-dimensional hydrodynamic code with a collisional-radiative atomic model was used to model the plasma and comparisons of theoretical results with experimental observation are discussed. Descriptions of both hydrodynamic and atomic physics code are given.