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I AbstractThe IGUR-3 [l] accelerator has been used to perform a series of experiments to investigate the dynamics of electron beam extracted into air. Several new modes of IGUR-3 operation have been developed. IGUR-3 belongs to the class of duect drive accelerators. The peculiarity of diode allows to form current pulse with duration of 3& 400 ns aid maximum of outed energy density at the beam axis up to 400 J/cm2. The elecaon beam parameters are: -beam total energy up to 15 kJ;