Speaker
Description
Simulation of a crystal-based positron source requires sophisticated modeling of the trajectories of electrons and positrons in a heavy crystalline material, such as a tungsten crystal. This also includes accounting for their multi-photon radiation and ionization energy losses. The models [1-3] for charged particle motion in an averaged atomic potential, as well as their radiation using the Baier-Katkov method [4], have been implemented into the Geant4 simulation toolkit [5] within the G4ChannelingFastSimModel [6] and G4BaierKatkov models, respectively. These models have been released in Geant4 version 11.2. Our recent updates will be included in the next Geant4 release later this year.
We provide a detailed description of the model, its performance, and its functionality, and we compare our simulation results with experimental data [7].
[1] A. I. Sytov, V. V. Tikhomirov, and L. Bandiera, Phys. Rev. Acc. And Beams 22, 064601 (2019).
[2] V. Guidi, L. Bandiera, V. Tikhomirov Phys. Rev. A 86, 042903 (2012).
[3] Bandiera et al., Nucl. Instr. Methods Phys. Res. B 355, 44 (2015).
[4] V.N. Baier, V.M. Katkov, V.M. Strakhovenko, Electromagnetic Processes at High Energies in Oriented Single Crystals (World Scientific, Singapore, 1998).
[5] J. Allison et al., NIM A 835, 186-225 (2016).
[6] A. Sytov et al., JKPS 83, 132–139 (2023).
[7] L. Bandiera et al. Eur. Phys. J. C 82, 699 (2022).
