Abstract
Detailed simulations of a Ne-like Fe X-ray laser pumped by a femtosecond laser system are presented. In this study, we have investigated an efficient multiple pumping pulse configuration including two 150 ps prepulses and one 100 fs main pulse for transient X-ray lasers. The influences of pumping pulse delay, duration, and intensity are studied. Simulation results suggest that a high repetition rate and high gain tabletop X-ray laser at 255 Å can be achieved with a total pumping energy less of than 0.4 J.