In this paper we present experimental research on the possibility of electron bunch generation at intensity around 1018 W/cm2. It is shown that by optimizing preplasma profile one can obtain collimated (~0.05 rad) electron beam with relatively high charge (30 pC) and temperature around 1.5 MeV. This beam can be used to study low-energy nuclear physics and to create secondary particle sources (neutrons, positrons, etc.) on lasers. We also demonstrate the possibility to reversely study the beam parameters, such as charge, based on yield measurements in photonuclear experiments and GEANT4 simulations.