Introduction to GEANT4
From UCL HEP PBT Wiki
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=== <span style="color:#000080"> Simple physics lists </span> === | === <span style="color:#000080"> Simple physics lists </span> === | ||
| - | <span style="color:#ff0000"> G4VUserPhysicsList </span> is used for simple physics lists. It has three methods: | + | The class <span style="color:#ff0000"> G4VUserPhysicsList </span> is used for simple physics lists. It has three methods: |
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* ConstructParticles(): define all necessary particles; | * ConstructParticles(): define all necessary particles; | ||
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* SetCuts(): define production thresholds in terms of range; | * SetCuts(): define production thresholds in terms of range; | ||
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| - | # | + | This example shows how to define your own class derived from the <span style="color:#ff0000"> G4VUserPhysicsList </span> base class. |
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<span style="color:#800000"> class MyPhysicsList:public G4VUserPhysicsList() </span> | <span style="color:#800000"> class MyPhysicsList:public G4VUserPhysicsList() </span> | ||
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<span style="color:#800000"> G4Gamma::GammaDefinition(); ... } </span> | <span style="color:#800000"> G4Gamma::GammaDefinition(); ... } </span> | ||
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| + | GEANT4 provides a variety of physics processes. These processes are decoupled from one another and the user can select those processes which are relevant to his/her simulation. There are seven categories of processes provided by GEANT4: | ||
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| + | # electromagnetic | ||
| + | #* standard | ||
| + | #* low Energy (Livermore Library / Penelope) | ||
| + | # hadronic | ||
| + | # decay | ||
| + | # photolepton-hadron | ||
| + | # optical | ||
| + | # parameterization - "fast simulation" physics | ||
| + | # transportation | ||
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| + | In method ConstructProcess() you have to define your physics processes: | ||
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<span style="color:#800000"> void MyPhysicsList :: ConstructProcess() </span> | <span style="color:#800000"> void MyPhysicsList :: ConstructProcess() </span> | ||
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| - | where the method ConstructEM() | + | where the method ConstructEM() is defined as: |
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<span style="color:#800000"> pmanager->AddDiscreteProcess(new G4GammaConversion); ...} </span> | <span style="color:#800000"> pmanager->AddDiscreteProcess(new G4GammaConversion); ...} </span> | ||
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| + | and the method ConstructGeneral() is defined as: | ||
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| + | <span style="color:#800000"> void MyPhysicsList::ConstructGeneral() </span> | ||
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The method SetCuts() is defined as: | The method SetCuts() is defined as: | ||
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=== <span style="color:#000080"> Detailed physics lists </span> === | === <span style="color:#000080"> Detailed physics lists </span> === | ||
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