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We report simulation results of pair production by ultra-intense lasersirradiating a gold target using the GEANT4 Monte-Carlo code. Certainexperimental features of the positron and electron energy spectra arereproduced, as well as trends with regard to target thickness and hot electrontemperature Te. For Te in the range 5-10 MeV, the optimal target thickness forpair production is found to be about 3 mm. Further Monte-Carlo simulations mayaid in the optimization of laser-driven positron sources.

Scaling of Laser Produced Pair Plasmas And Comparison With Experimental Data