The spectral-angular distribution measurements of fast protons from the rear side of a target in experiments on the SOKOL-P facility at laser intensity of 10$^{19}$ W/cm$^{2}$

The developed in RFNC-VNIITF 10-TW ``SOKOL-P'' laser facility was put into operation in 2002. It delivers the 0.8 ps of pulse duration and up to 8 J of on target energy. The mean intensity of $>$10$^{19}$ W/cm$^{2}$ of high contrast irradiation have been achieved with the help of the off-axis parabola $f $/1.5, providing 6 $\mu $m FWHM focal spot. The ns scale intensity contrast ratio is $>$ 2*10$^{11}$, the energy contrast ratio (to non-ionizing 1 ms ASE pedestal) is 2*10$^{6}$. Due to the high value of contrast ratio ultra thin Al foils down to 0.08 $\mu $m thick are not damaged before the main pulse arrival. Spatial-energy spectrum of fast protons (energies of 1{\ldots}8 MeV) measured by two types of spectrometers; up to 1.5{\%} of conversion efficiency of laser energy to proton energy; and 9 MeV of maximum proton energy have been obtained in laser based acceleration experiments.