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Interaction of relativistic femtosecond pulses with pre-pulse created long slightly under critical plasma tail was studied experimentally and theoretically. We achieved efficient control over energy of fast electrons as well as conversion to gamma rays by the proper choice of pre-pulse parameters. Experiments were made using 45 fs TW laser with focused intensity up to 1019 W/cm2. The fully relativistic 3D3V PIC code Mandor running on Lomonosov supercomputer was used for numerical simulations.