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In this work, we simulated the distributions of positrons with different kinetic energies as a function of linear transverse and angular deflections from the electron beam axis and the exit time produced upon normal incidence of "needle-like" "instantaneous" electron beams with kinetic energies E– = 55, 220, 1000 MeV on optimal converter targets (at the exit from the converters). The calculation results are compared with the available published data and experimental requirements. [ABSTRACT FROM AUTHOR]

In this paper, we report the characteristics of the generated beams, the extracted electron beam and the beam of secondary electrons/positrons, of the LPI accelerator complex Pakhra as of November 2019 for testing and calibrating detectors used in large accelerator and astrophysical experiments. At energies of 250–500 MeV of the electron beam ejected into Hall 1 from the S-25R synchrotron, its energy resolution is δ ~ 1% and the intensity can be changed by collimators in the range of 103–1010 s–1. The quasi-monochromatic beam of secondary electrons produced in Hall 2 typically has an energy in the range of 50–300 MeV, a corresponding energy resolution of δ = 14–2%, and an intensity of ~ 102 s–1. The performed simulation of the characteristics of the secondary positron beam allowed selecting the optimal geometry of the setup and showed good agreement with the experimental data obtained later. [ABSTRACT FROM AUTHOR]