Gabriele Cosmo
146 lines
5.0 KiB
Plaintext
146 lines
5.0 KiB
Plaintext
--------------------------------------------------
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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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AnaEx02
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-------
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Examples AnaEx01, AnaEx02 and AnaEx03 show the usage of histogram and tuple
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manipulations using G4Analysis, ROOT and AIDA compliant systems on the same
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scenario. All analysis manipulations (histo booking, filling, saving histos
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in a file, etc...) are located in one class : HistoManager, implementation of
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which is different in each example. All the other classes are same in all
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three examples.
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This example shows the usage of histogram and tuple manipulations using
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ROOT system. Please install ROOT before building this example:
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http://root.cern.ch
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The example is an adaptation of examples/novice/N03. It describes a simple
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sampling calorimeter setup.
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1- Detector description
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-----------------------
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The calorimeter is a box made of a given number of layers. A layer
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consists of an absorber plate and of a detection gap. The layer is
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replicated.
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Six parameters define the calorimeter :
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- the material of the absorber,
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- the thickness of an absorber plate,
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- the material of the detection gap,
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- the thickness of a gap,
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- the number of layers,
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- the transverse size of the calorimeter (the input face is a square).
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The default geometry is constructed in DetectorConstruction class,
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but all of the above parameters can be modified interactively via
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the commands defined in the DetectorMessenger class.
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|<----layer 0---------->|<----layer 1---------->|<----layer 2---------->|
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==========================================================================
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beam || absorber | gap || absorber | gap || absorber | gap ||
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======> || | || | || | ||
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|| | || | || | ||
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==========================================================================
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2- Physics list
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---------------
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The particle's type and the physic processes which will be available
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in this example are set in the FTFP_BERT physics list.
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3- Action Initialization
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------------------------
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A newly introduced class, ActionInitialization,
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instantiates and registers to Geant4 kernel all user action classes
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which are defined thread-local and a run action class
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which is defined both thread-local and global.
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The thread-local action classes are defined in
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ActionInitialization::Build()
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and the global run action class is defined in
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ActionInitialization::BuildForMaster().
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Note that ActionInitialization::Build() is also used to
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instatiate user action clasess in sequential mode.
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4- An event : PrimaryGeneratorAction
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------------------------------------
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The primary kinematic consists of a single particle which hits the
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calorimeter perpendicular to the input face. The type of the particle
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and its energy are set in the PrimaryGeneratorAction class, and can
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be changed via the G4 build-in commands of ParticleGun class.
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5- Histograms
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-------------
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To produce histograms, ROOT system must be installed
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AnaEx02 can produce 4 histograms :
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EAbs : total energy deposit in absorber per event
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EGap : total energy deposit in gap per event
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LAbs : total track length of charged particles in absorber per event
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LGap : total track length of charged particles in gap per event
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And 2 Ntuples :
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- Ntuple1:
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- one row per event : EnergyAbs EnergyGap
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- Ntuple2:
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- one row per event : TrackLAbs TrackLGap
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These histos and ntuples are booked in HistoManager and filled from
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EventAction.
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One can control the name of the histograms file :
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default name : AnaEx02
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format : root
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See HistoManager constructor
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6- 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_AnaEx02/AnaEx02
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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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7- How to run
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--------------
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- Execute AnaEx02 in the 'interactive mode' with visualization:
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% ./AnaEx02
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and type in the commands from run.mac line by line:
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Idle> /control/verbose 2
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Idle> /tracking/verbose 1
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Idle> /run/beamOn 10
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Idle> ...
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Idle> exit
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or
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Idle> /control/execute run.mac
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....
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Idle> exit
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- Execute AnaEx02 in the 'batch' mode from macro files
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(without visualization)
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% ./AnaEx02 run.mac
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% ./AnaEx02 run.mac > run.out
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The AnaEx02.in macro is used in Geant4 testing.
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