Analyses of the short pulse laser pumped transient collisional excited X-ray lasers

The soft x-ray gain of the transient collisional excited (TCE) Ni-like Ag l aser is investigated using the plasma hydrodynamics and atomic kinetics cod es. The gain is calculated for a plasma produced from two 100ps laser irrad iated solid target to show qualitative agreement with the experiment. The c alculation shows significant improvement of the gain using a thin foil targ et pumped by two short laser pulses, because of a better coupling of the pu mp laser energy into the gain region of the plasma. The codes will provide performance prediction as well as optimization of the experimental studies of the TCE x-ray lasers.