Geant4 interface

The accel directory contains components exclusive to coupling Celeritas with Geant4 for user-oriented integration. A simple interface for multithreaded or serial applications is demonstrated in Geant4 integration examples, and the more advanced implementation can be inspected in the Integrated Geant4 application (celer-g4) app.

This integration interface is based on two main mechanisms:

• celeritas::UserActionIntegration: Compatible with all Geant4 versions supported by Celeritas.

• celeritas::TrackingManagerIntegration: Compatible only with Geant4 v11 and newer, as it requires Geant4’s G4VTrackingManager interface for particles.

On either case, celeritas::SetupOptions must be valid at the latest during the G4UserRunAction::BeginOfRunAction() call in the master thread, to initialize celeritas::SharedParams and celeritas::LocalTransporter. Nevertheless, since the user might need access to these options during other UserAction constructors (e.g. initializing sensitive detector options in G4VUserDetectorConstruction), assigning them via celeritas::TrackingManagerIntegration::SetOptions before G4RunManager::SetUserInitialization calls is recommended.

• High level interfaces
  • Tracking manager
  • Fast simulation
  • User action
• Celeritas setup
  • Helper functions
  • Magnetic field setup
  • Macro UI Options
• Detailed interface
• Interface utilities
  • MakeMTLogger()
  • celeritas::ExceptionConverter
  • celeritas::AlongStepFactoryInput
  • celeritas::AlongStepFactoryInterface
• Classes usable by Geant4
  • Fields
  • Primary generators
  • Physics constructors
  • Physics lists
  • Sensitive detectors
• Low-level Celeritas integration
  • Geant4 geometry utilities
  • Geant4 physics interfaces