Gabriele Cosmo
99 lines
3.1 KiB
Plaintext
99 lines
3.1 KiB
Plaintext
$Id: README 78303 2013-12-11 10:50:38Z gcosmo $
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-------------------------------------------------------------------
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=========================================================
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Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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=========================================================
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OpNovice
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--------
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This example presently illustrates the following basic concepts, and in
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particular (indicated with ***), how to use G4 for optical photon
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generation and transport. Other extended example of what is possible
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in Geant4 with optical photons can be found at
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examples/extended/optical/LXe and wls.
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main()
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------
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==> define Random Number Engine and initial seed
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G4VUserPhysicsList
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------------------
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==> define particles; including *** G4OpticalPhoton ***
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define processes; including *** G4Cerenkov ***
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*** G4Scintillation ***
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*** G4OpAbsorption ***
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*** G4OpRayleigh ***
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*** G4OpBoundaryProcess ***
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G4VUserDetectorConstruction
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---------------------------
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==> define material: Air and Water
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define simple G4box geometry
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*** add G4MaterialPropertiesTable to G4Material ***
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*** define G4LogicalSurface(s) ***
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*** define G4OpticalSurface ***
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*** add G4MaterialPropertiesTable to G4OpticalSurface ***
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G4VUserPrimaryGeneratorAction
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-----------------------------
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==> Use G4ParticleGun to shoot a charge particle into a Cerenkov radiator
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==> A messenger command allows to define interactivly the polarization of an
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primary optical photon (see for instance optPhoton.mac)
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G4UserRunAction
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---------------
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==> define G4Timer (start/stop)
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set verbose levels
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G4UserStackingAction
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--------------------
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==> show how to count the number of secondary particles in an event
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Visualisation
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-------------
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The Visualization Manager is set in the main().
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The initialisation of the drawing is done via a set of /vis/ commands
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in the macro vis.mac. This macro is automatically read from
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the main in case of interactive running mode.
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The detector has a default view which is a longitudinal view of the tank.
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The tracks are drawn at the end of event, and erased at the end of run.
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HOW TO START
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------------
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- compile and link to generate an executable
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% cd OpNovice
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% gmake
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This example handles the program arguments in a new way.
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It can be run with the following optional arguments:
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% OpNovice [-m macro ] [-u UIsession] [-t nThreads]
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The -t option is available only in multi-threading mode
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and it allows the user to override the Geant4 default number of
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threads. The number of threads can be also set via G4FORCENUMBEROFTHREADS
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environment variable which has the top priority.
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- execute OpNovice in 'batch' mode from macro files
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% OpNovice -m OpNovice.in
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- execute OpNovice in 'interactive mode' with visualization
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% OpNovice
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....
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Idle> type your commands. For instance:
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Idle> /control/execute optPhoton.mac
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....
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Idle> exit
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