Neonlike iron x-ray laser: Population kinetics and radiative transfer - art. no. 056407

In this work, we present collisional-radiative calculations for neonlike ir on 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 be tter agreement with a recent experiment (a prepulse plus two main pulses) o n the 3p-3s 0-1 line, than the code EHYBRID which ignores the above interac tion. Saturation is attained for plasma, lengths near 1 cm, and the calcula ted effective gain agrees with the experimental value, at least for the fir st main pulse.