Introduction to GEANT4
From UCL HEP PBT Wiki
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* <span style="color:#ff0000"> G4RunManager </span>: Manages the simulation process; | * <span style="color:#ff0000"> G4RunManager </span>: Manages the simulation process; | ||
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== <span style="color:#000080"> The function main() </span> == | == <span style="color:#000080"> The function main() </span> == | ||
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== <span style="color:#000080"> Physics processes </span> == | == <span style="color:#000080"> Physics processes </span> == | ||
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You can build your own physics list or chose from already built physics lists. To build your own physics lists, you can use two base physics list classes: <span style="color:#ff0000"> G4VUserPhysicsList </span> and <span style="color:#ff0000"> G4ModularPhysicsList </span>. The class <span style="color:#ff0000"> G4VUserPhysicsList </span> is used for simple physics lists while <span style="color:#ff0000"> G4ModularPhysicsList </span> is used to build more complex physics lists. There exist also already built pre-packaged physics lists. | You can build your own physics list or chose from already built physics lists. To build your own physics lists, you can use two base physics list classes: <span style="color:#ff0000"> G4VUserPhysicsList </span> and <span style="color:#ff0000"> G4ModularPhysicsList </span>. The class <span style="color:#ff0000"> G4VUserPhysicsList </span> is used for simple physics lists while <span style="color:#ff0000"> G4ModularPhysicsList </span> is used to build more complex physics lists. There exist also already built pre-packaged physics lists. | ||
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=== <span style="color:#000080"> Detailed physics lists </span> === | === <span style="color:#000080"> Detailed physics lists </span> === | ||
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If you want to build more realistic physics list you have to use the class <span style="color:#ff0000"> G4VModularPhysicsList </span>. For example, the photon from the example above can undergo compton scattering apart from conversion. In <span style="color:#ff0000"> G4VModularPhysicsList </span> you can group the physics processes into separate modules: EM physics, hadronic physics, decay physics etc. | If you want to build more realistic physics list you have to use the class <span style="color:#ff0000"> G4VModularPhysicsList </span>. For example, the photon from the example above can undergo compton scattering apart from conversion. In <span style="color:#ff0000"> G4VModularPhysicsList </span> you can group the physics processes into separate modules: EM physics, hadronic physics, decay physics etc. | ||
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== <span style="color:#000080"> Generate primary particles </span> == | == <span style="color:#000080"> Generate primary particles </span> == | ||
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You derive your own class from <span style="color:#ff0000"> G4VUserPrimaryGeneratorAction </span> base class. | You derive your own class from <span style="color:#ff0000"> G4VUserPrimaryGeneratorAction </span> base class. | ||
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== <span style="color:#000080"> Optional user classes </span> == | == <span style="color:#000080"> Optional user classes </span> == | ||
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[http://geant4.web.cern.ch/geant4/UserDocumentation/Doxygen/examples_doc/html/group__extended__common__userActions.html Here] you can find examples of user defined RunAction and EventAction classes. | [http://geant4.web.cern.ch/geant4/UserDocumentation/Doxygen/examples_doc/html/group__extended__common__userActions.html Here] you can find examples of user defined RunAction and EventAction classes. | ||
