Gabriele Cosmo
120 lines
4.5 KiB
Plaintext
120 lines
4.5 KiB
Plaintext
$Id: README 99607 2016-09-28 13:33:42Z 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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AnaEx01
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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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G4Analysis system.
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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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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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AnaEx01 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 and its format:
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default name : AnaEx01
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The format of the histogram file can be : root (default),
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xml, csv. Include correct g4nnn.hh in HistoManager.hh
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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_AnaEx01/AnaEx01
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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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