Simulation of hybrid positron source based on planar and axial channeling radiation of relativistic electrons

A hybrid positronsource based on the Channeling Radiation (CR) of relativistic electrons on different planes and axes of Si, C, Ge and W crystals is investigated. We have calculated CR spectra from different planes and axes of Si, C, Ge and W crystal using the Doyle–Turner approximation for the continuum potentials of crystallographic planes and axes. The dependence of CR on the incidence angle of electrons is also investigated. The CR is then impinging on an amorphous tungsten target producing positrons by e+-e- pair creation. The simulations are made with our developed Mathematica codes which calculate the photon CR in the crystal target and GEANT4 code which calculates the materialization of photons into e+e- pairs in amorphous W target. The results of this work are in good agreement with other results.