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P.N. Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, RussiaReceived 10 August 2012, accepted 29 October 2012Published online 01 February 2013Key words Laser-driven plasma, electron acceleration, X-ray generation, PIC laser-plasma simulations,GEANT code.The complex approach combining experimental data on X-ray diagnostics of plasma, the results of the nu-merical PIC simulation of laser-plasma interaction (namely – fast electron spectra), as well as Monte-Carlocalculation of the resulted X-ray spectrum is presented. Direct comparison of the experimental and simulatedX-rayspectra(obtainedatlaserpulseintensityof2.5 |