Gabriele Cosmo
91 lines
3.2 KiB
Plaintext
91 lines
3.2 KiB
Plaintext
$Id: README,v 1.17 2010-11-08 10:38:44 maire Exp $
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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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This example shows the usage of histogram and tuple manipulations using
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G4Analysis system. All analysis manipulations
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(histo booking, filling, saving histos in a file, etc...)
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are located in one class : HistoManager.
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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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|| absorber | gap || absorber | gap || absorber | gap ||
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beam || | || | || | ||
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======> || | || | || | ||
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==========================================================================
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2- 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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3- Histograms
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-------------
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AnaEx01 can produce 4 histograms :
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histo 1 : total energy deposit in absorber per event
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histo 2 : total energy deposit in gap per event
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histo 3 : total track length of charged particles in absorber per event
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histo 4 : total track length of charged particles in gap per event
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And 1 Ntuple :
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one row per event : EnergyAbs EnergyGap TrackLAbs TrackLGap
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These histos are booked in HistoManager and filled from 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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hbook, xml, csv. Include correct g4nnn.hh in HistoManager.hh
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Using hbook format
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------------------
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Need a special treatement : the Cern Library must be installed and the
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environment variable CERNLIB correctly set. Then, *before* compiling,
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activate G4_USE_HBOOK in GNUmakefile and g4hbook.hh in HistoManager.hh
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