Introduction to GEANT4

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There are eight base classes.

  • Three classes are mandatory
G4VUserDetectorConstruction
Describe the experimental setup, geometry and materials
G4VUserPhysicsList
Define particles, physics processes and range cuts
G4UserPrimaryGeneratorAction
Describe particle source, source dimensions, initial position, energy spectrum, angular distributions
  • The rest are optional
G4UserRunAction
Define and store histograms
G4UserEventAction
Event selection and analysis of simulation data
G4UserStackingAction
Customize priority of tracks
G4UserTrackingAction
Decide whether a trajectory should be stored or not
G4UserSteppingAction
Kill, suspend, postpone a track

You can create your own classes which are derived from the base classes. All of them should be registered with the G4RunManager. In function main() which is the skeleton of your simulation code you instantiate G4RunManager and notify it of your mandatory and optional classes.

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