Abstract
A soft x-ray laser amplifier based on solid target plasma is numerically investigated using a 2-D hydrodynamic code ARWEN with radiative transport solved by multigroup method based on adaptive mesh refinement. The code has been used to describe the spatial and temporal plasma evolution and, ultimately, to understand how to generate an ideal preformed plasma in the transient collisional pumping scheme. Firstly, we examine the influence of the laser driver spatial profile on the characteristics of the preformed plasma. We show that using a super Gaussian, instead of gaussian, spatial transverse profile leads to a substantial reduction of the transverse refraction by two orders of magnitude and to an enlargement of the gain zone surface by about a factor of 2. Secondly, we perform a study on the pre-pulse significance in the transient collisional scheme, as it was done several years ago for the J=0-1 Ne-like line in the quasi-steady-state pumping. All above studies were carried out for an iron target with gain on the J = 0- 1 neon like transition at λ = 25.5nm
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