Gabriele Cosmo
86 lines
2.8 KiB
Plaintext
86 lines
2.8 KiB
Plaintext
=========================================================
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Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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=========================================================
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Example genericPL
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W. Pokorski (1)
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I. Hrivnacova (2)
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(1) CERN
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(2) Institut de Physique Nucléaire (IPNO), Université Paris-Su
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Examples in the physicslist category show the possible ways how to define
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a physics list from Geant4 physics constructors. This example demonstrates
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the usage of G4GenericPhysicsList to build the concrete physics list at
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the run time.
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In Geant4 versions < 10.4, the generic physics list was demonstrated in the
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extended/hadronic/Hadr05 example.
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The G4GenericPhysicsList class allows to build the physics list at the run
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time in two possible ways, either by processing a macro file
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containing the 'physics list' or by passing a vector of 'physics
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constructors' names to the constructor of the class.
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To run the example you can call
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./genericPL -m run.mac [ -p FTFP_BERT.mac ]
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where FTFP_BERT.mac is the macro file containing the 'physics list'.
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If you run this example by calling
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./genericPL -m run.mac
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the physics list will be constructed by using a vector of the names of
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the different physics constructor defined in the genericPL.cc file.
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The same experimental setup is used for all examples in the physicslist category:
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1- Detector description
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-----------------------
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The geometry (defined in the DetectorConstruction class) consists in a box of scintillator material (CsI) followed by a thin box of air (screen) which is used to simplify scoring.
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2- Primary generator
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--------------------
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The primary generator is defined with usage of G4ParticleGun.
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The default particle is proton which hits the box perpendicular to the input face.
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The type of the particle and its energy are set in the PrimaryGeneratorAction class, and can
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be changed via the G4 built-in commands of the G4ParticleGun class.
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3- Scoring (ntuples)
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--------------------
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The screen volume is associated with a sensitive detector, ScreenSD,
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which accounts the following particle properties:
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- trackID
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- particle PDG encoding
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- particle kinetic energy
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- particle X,Y position
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- particle time
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The scored quantities are filled in the Screen ntuple, which is defined using G4AnalysisManager
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in RunAction class. The ntuple is saved in a Root file, which name is set to be equal to the
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example name in main () function.
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4- How to build
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----------------
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An additional step is needed when building the example with GNUmake
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due to using the extra shared directory:
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% cd path_to_example/example
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% gmake setup
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% gmake
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This will copy the files from shared in the example include and src;
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to remove these files:
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% gmake clean_setup
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