Abstract: Heaven 1 pre-amplifier is a double pass, double sided electron beam pumped krF laser system. The largest energy transmission efficiency from the Marx generator to the diodes and smaller post-pulse were obtained by optimizing the anode-cathode gap. The energies deposited in the gas were investigated as a function of Marx voltage for both 30μm Al and 20μm Ti anode foils at 0.10，0.15, 0.20 and 0.22 MPa cell pressures. The investigation was performed for the same 35μm Ti pressure foil. The lifetimes of the anode and pressure foils were studied and the damage causes of the anode and pressure foils were analyzed . The optimization of experimental conditions for a long time operation was realized.