Obtainment of positrons using an electron jet

Background. The work is aimed at development of physical bases for creation of positron sources on the basis of conversion of electrons with 0,1-10 GeV energy into electron-positron showers in the target made of materials with large Z, for example tungsten-rhenium alloy (W$_{75}$Re$_{25}$). It is assumed that after exiting the target the positrons, being a part of the shower, would be separated from the electrons and used further for formation of high-current positron jets with given emittance, giving new opportunities for experimental research and for solution of a number of physical and applied problems. Materials and methods. The study was accomplished using the method of mathematical simulation via Geant4 and Comsol4 packages. Results. The authors obtained the dependences of average number of positrons per one incident electron, as well as average energy and angular distributions of positrons exiting the target when it is reached by 10$^5$ electrons. The researchers also obtained spatial distribution of particles (positrons, electrons and gamma-quantums) from the side of positrons' exit from the target. Conclusions. The obtained results allow to optimally select the initial parameters of the electron jet, thickness and chemical compound of the target for generation of the positron jet with given parameters.