Import Geant4 6.2.0 source tree
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Gabriele Cosmo
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$Id: README,v 1.3 2004/06/23 11:28:26 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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PhotonProcesses
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---------------
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This test is devoted to the photon processes: gamma conversion, coherent
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and incoherent scattering, photoelectric effect. It allows to compute
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absorption coefficients and to plot final state.
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1- GEOMETRY DEFINITION
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It is a single box representing a 'semi infinite' homogeneous medium.
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Two parameters define the geometry :
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- the material of the box,
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- the (full) size of the box.
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The default geometry (100 m of water) is constructed in
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DetectorConstruction, but the above parameters can be changed
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interactively via the commands defined in DetectorMessenger.
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2- PHYSICS LIST
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The particle list contains only gamma, e+, e-, mu+, mu-.
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The physics list contains the 'standard' electromagnetic processes.
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3- AN EVENT : THE PRIMARY GENERATOR
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The primary kinematic consists of a single particle starting at the edge
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of the box. The type of the particle and its energy are set in
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PrimaryGeneratorAction (1 MeV gamma), and can be changed via the G4
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build-in commands of ParticleGun class (see the macros provided with
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this example).
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4- PHYSICS
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The incident particle is a photon. The event is killed at the first
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interaction of the photon.
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The absorption length is computed as the mean value of the track length
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of the photon.
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The energy spectrum and the angular distribution of the scattered photon
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(if any) and of the secondaries are plotted (see SteppingAction).
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A set of macros defining various run conditions are provided.
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The processes are actived/inactived in order to survey the processes
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individually.
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5- HISTOGRAMS
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The test contains 6 built-in 1D histograms, which are managed by the
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HistoManager class and its Messenger. The histos can be individually
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activated with the command :
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/testem/histo/setHisto id nbBins valMin valMax unit
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where unit is the desired unit for the histo (MeV or keV, etc..)
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(see the macros xxxx.mac).
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1 "scattered primary particle: energy spectrum"
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2 "scattered primary particle: costheta distribution"
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3 "charged secondaries: energy spectrum"
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4 "charged secondaries: costheta distribution"
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5 "neutral secondaries: energy spectrum"
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6 "neutral secondaries: costheta distribution"
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The histograms can be viewed using PAW. See below the note on
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ANAPHE+AIDA.
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One can control the name of the histograms file with the command:
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/testem/histo/setFileName name (default photonprocesses.paw)
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Note that, by default, histograms are disabled. To activate them,
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uncomment the flag G4ANALYSIS_USE in GNUmakefile.
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6- VISUALIZATION
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The Visualization Manager is set in the main().
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The initialisation of the drawing is done via the commands
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/vis/... in the macro vis.mac. To get visualisation:
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> /control/execute vis.mac
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The detector has a default view which is a longitudinal view of the
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box.
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The tracks are drawn at the end of event, and erased at the end of run.
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7- HOW TO START ?
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compile and link to generate an executable
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% cd geant4/examples/extended/electromagnetic/PhotonProcesses
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% gmake
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execute PhotonProcesses in 'batch' mode from macro files :
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% PhotonProcesses compt.mac
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execute PhotonProcesses in 'interactive mode' with visualization :
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% PhotonProcesses
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Idle> control/execute vis.mac
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....
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Idle> type your commands
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....
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Idle> exit
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8- Using histograms
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-------------------
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By default the histograms are not activated. To activate histograms
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the environment variable G4ANALYSIS_USE should be defined. For instance
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uncomment the flag G4ANALYSIS_USE in GNUmakefile.
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To use histograms any of implementations of AIDA interfaces should
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be available (see http://aida.freehep.org).
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A package including AIDA and extended interfaces also using Python
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is PI, available from: http://cern.ch/pi .
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Once installed PI or PI-Lite in a specified local area $MYPY, it is
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required to add the installation path to $PATH, i.e. for example,
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for release 1.2.1 of PI:
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setenv PATH ${PATH}:$MYPI/1.2.1/app/releases/PI/PI_1_2_1/rh73_gcc32/bin
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CERN users can use the PATH to the LCG area on AFS.
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Before compilation of the example it is optimal to clean up old
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files:
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gmake histclean
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gmake
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Before running the example the command should be issued:
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eval `aida-config --runtime csh`
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It is possible to choose the format of the output file with
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histograms using UI command:
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/testem/histo/setFileType type
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The following types are available: hbook, root, xml.
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