[en] The results of numerical studies of the processes occurring in a high-current electron accelerator comprising iductive-capacitive energy storage with exploding-foil current breaker and a vacuum plane geometry diode are presented. The studies included a self-consistent calculation of foil explosion in the breaker by means of the MHD method, two-contour electric circuit commutation and electron beam generation in the diode with an exploding cathode. While cathode plasma motion in diode the voltage-current coupling ratio has been designated by the ''3/2'' law taking into account the gap variation between the cathode and anode. For checking reliability of values predicted at numerical simulation of the processes in the accelerator the comparison of calculation results and experimental data obtained at the IREN installation has been made. The satisfactory agreement obtained between them has made possible numerical optimization of the accelerator operation by foils dimensions in the breaker and the time of diode switching. According calculation data the maximum electron energy in the beam equals 400 keV, the beam current being 50 kA and efficiency about 4%. In the mode with the highest beam current which equals 120 kA, the enrgy transfer efficiency into the beam from a capacitor battery is about 6.5%, the maximum electron energy in this mode is 26O keV the carrent being 80 kA