Neonlike iron x-ray laser: population kinetics and radiative transfer

In this work, we present collisional-radiative calculations for neonlike iron x-ray lasers. These calculations show the importance of the interaction between the x-ray laser beam and the amplifying medium, which is taken into account in the paraxial Maxwell-Bloch approach. Our calculations are in better agreement with a recent experiment (a prepulse plus two main pulses) on the 3p-3s 0-1 line, than the code EHYBRID which ignores the above interaction. Saturation is attained for plasma lengths near 1 cm, and the calculated effective gain agrees with the experimental value, at least for the first main pulse.