Introduction to GEANT4
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Introduction to GEANT4
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GEANT4 is a software toolkit based on C++. In your code you have to define: * Your experimental setup - geometry, materials and primary particles. * Which physics process you are interested in. * You may take actions during the simulation - inspect and store results. The interaction with GEANT4 is done via base classes. ; Mandatory classes: * <span style="color:#800000"> G4VUserDetectorConstruction </span>: Describe the experimental setup, geometry and materials * <span style="color:#800000"> G4VUserPhysicsList </span>: Define particles, physics processes and range cuts * <span style="color:#800000"> G4UserPrimaryGeneratorAction </span>: Describe particle source, source dimensions, initial position, energy spectrum, angular distributions ; Optional classes: * <span style="color:#800000"> G4UserRunAction </span>: Define and store histograms * <span style="color:#800000"> G4UserEventAction </span>: Event selection and analysis of simulation data * <span style="color:#800000"> G4UserStackingAction </span>: Customize priority of tracks * <span style="color:#800000"> G4UserTrackingAction </span>: Decide whether a trajectory should be stored or not * <span style="color:#800000"> G4UserSteppingAction </span>: Kill, suspend, postpone a track ; Manager class * <span style="color:#800000"> G4RunManager </span>: Manages the simulation process The function main() is the skeleton of your simulation code. Inside the function you instantiate G4RunManager and notify it of your mandatory and optional classes. Example main() function:
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