Introduction to GEANT4

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== Generate primary particles ==  
== Generate primary particles ==  
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G4VUserPrimaryGeneratorAction is a mandatory user action class to control the generation of primary particles.
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The particle generation is done via classes G4ParticleGun and G4GeneralParticleSource.
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* <span style="color:#ff0000"> G4ParticleGun </span> is used to simulate a beam of particles. It shoots a primary particle of a certain energy and direction from a given point at a given time.
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* <span style="color:#ff0000"> G4GeneralParticleSource </span> the primary vertex is randomly chosen on surface of a given volume with pre-defined energy spectra.
== Optional user classes ==
== Optional user classes ==

Revision as of 16:52, 6 July 2014

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