De-channeling in terms of instantaneous transition rates -- Computer simulations for 855 MeV electrons at (110) planes of diamond

Abstract

Monte-Carlo simulation calculation have been performed for 855 MeV electrons channeling in (110) planes of a diamond single crystal. The continuum potential picture has been utilized. Both, the transverse potential and the angular distributions of the scattered electrons at screened atoms are based on the Doyle-Turner scattering factors which were extrapolated with the functional dependence of the Molière representation to large momentum transfers. Scattering cross-sections at bound electrons have been derived for energies less than 30 keV from the double differential cross-section as function of both, energy and momentum transfer, taking into account also longitudinal and transverse excitations. For energies above 30 keV the Møller cross-section is used. The dynamics of the particle in the continuum transverse potential has been described classically. Results of the channeling process are presented in terms of instantaneous transition rates as function of the penetration depth, indicating that channeling can be described by a single exponential function only after the equilibration phase has been reached after about 15 $\mu$m. As a byproduct, improved drift and diffusion coefficients entering the Fokker-Planck equation have been derived with which its predictive power can be improved.

References in corpus (3)

• All-atom relativistic molecular dynamics simulations of channeling and radiation processes in oriented crystals
• Channeling experiments at planar diamond and silicon single crystals with electrons from the Mainz Microtron MAMI
• Electron channeling experiments with bent silicon single crystals -- a reanalysis based on a modified Fokker-Planck equation

Cited by in corpus (3)

• Beam steering with quasi-mosaic bent silicon single crystals -- Computer simulations for 855 MeV and 6.3 GeV electrons and comparison with experiments
• Topical Issue "Dynamics of Systems on the Nanoscale (2021)". Editorial
• Observation of narrow-band $\gamma$ radiation from a boron-doped diamond superlattice with an 855 MeV electron beam