Simulation model of crystal-based beam extraction using BDSim toolkit enhanced with Geant4 G4ChannelingFastSimModel

We present a simulation model for crystal-based beam extraction of lepton beams from an accelerator by using a bent crystal. This model utilizes the BDSim toolkit for particle dynamics in an accelerator in conjunction with the Geant4 G4ChannelingFastSimModel for beam deflection in a bent crystal and G4BaierKatkov for radiation losses. In order to link these codes, we designed a new BDSim accelerator component - a bent crystal compatible with G4ChannelingFastSimModel.
As a demonstration, we constructed a complete simulation model of the DESY II Booster Synchrotron within BDSim, incorporating all relevant accelerator components and apertures. The model accounts for betatron and synchrotron oscillations, as well as radiation losses in an oriented crystal, using the Baier-Katkov radiation integral. Simulation results demonstrate the extraction of a primary monoenergetic 6 GeV electron beam, characterized by a charge of 23 pC, a horizontal beam emittance of 3.6 $\mu$m$\cdot$rad, a vertical beam emittance of 0.32 $\mu$m$\cdot$rad, and an energy spread of 0.008. Under the simulated conditions, (1.42 $\pm$ 0.02 %) of the initial circulating beam reaches the septum entrance. This corresponds to an extraction efficiency of (28.1 $\pm$ 0.4 %) when evaluated relative to the particles intercepted by the bent crystal.
The approach provides a powerful tool to significantly accelerate R\&D for applications related to crystal-based extraction and collimation in lepton accelerators and colliders.