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Geant4/examples/extended/eventgenerator/exgps/

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Name Size       Last modified (GMT) Description
Back Parent directory       2024-12-05 15:16:16
Folder include/       2024-12-05 15:16:16
Folder macros/       2024-12-05 15:16:16
Folder src/       2024-12-05 15:16:16
Folder stattest/       2024-12-05 15:16:16
File CMakeLists.txt 2114 bytes       2024-12-05 15:16:16
File GNUmakefile 357 bytes       2024-12-05 15:16:16
File History 7623 bytes       2024-12-05 15:16:16
File README 3016 bytes       2024-12-05 15:16:16
C++ file exgps.cc 3654 bytes       2024-12-05 15:16:16
File exgps.in 854 bytes       2024-12-05 15:16:16
File exgps_MT.in 762 bytes       2024-12-05 15:16:16
File exgps_batch.in 814 bytes       2024-12-05 15:16:16
File exgps_batch.out 1381 bytes       2024-12-05 15:16:16
File plotHisto.C 809 bytes       2024-12-05 15:16:16
File vis.mac 2108 bytes       2024-12-05 15:16:16 
  1 
  2                    Extended Example for G4GeneralParticleSource (GPS)
  3                    -------------------------------------------------- 
  4 
  5   exgps is created to demonstrate the usage of G4GeneralParticleSource
  6   for generating  primary particle according to user defined distributions.
  7   These range from simple monocromatic point source to complicated mutiple
  8   sources with various biasing schemes. 
  9   
 10   http://geant4.web.cern.ch/geant4/UserDocumentation/UsersGuides
 11         /ForApplicationDeveloper/html/ch02s07.html
 12    
 13    
 14   1 - GEOMETRY
 15 
 16   Simple geometry consists of a "Vacuum" world and, in it, two other components:
 17     - An alunimium box : 20 x 20 x 20 cm in size, cerntered at the origin.
 18     - A SiO2 sphere (radius 5 cm) is placed at the centre of the aluminium box.
 19 
 20   2 - PHYSICS
 21 
 22   Tranportation process only for all particles.
 23 
 24   3 - EVENT
 25 
 26   The event generator is the G4GeneralParticleSource (GPS). The instantiation of
 27   G4GeneralParticleSource is same as that for G4ParticleGun. 
 28   See the exGPSPrimaryGeneratorAction.cc file for details.  
 29   
 30   4 - VISUALIZATION
 31  
 32   Visualisation of the geometry and the tracks is possible with many of the 
 33   G4 visualisation packages.
 34   An example of displaying the geometry and tracks using OGL is given in the 
 35   macro vis.mac.  
 36 
 37   5 - HISTOGRAMS
 38 
 39   This example implements an histo manager which creates histograms and
 40   ntuples using Geant4 analysis tools.
 41      
 42   The output file contains 6 histograms and one ntuple:
 43 
 44   histo1D 1: energy spectrum.
 45   histo1D 2: vertex: radial distribution dN/dv.
 46   histo1D 3: angular distribution: cos(theta).
 47   histo1D 4: angular distribution: phi.      
 48   histo2D 1: vertex position in the X-Y plane.
 49   histo2D 2: vertex position in the X-Z plane.
 50   histo2D 3: vertex position in the Y-Z plane.
 51   histo2D 4: angular distribution: phi-cos(theta).
 52   histo2D 5: angular distribution: of phi-theta.
 53  
 54   In the ntuple the following data are recorded for each incident particle:  
 55 
 56   Particle ID
 57   Incident Position (x,y,z);
 58   Incident Angle (theta,phi);
 59   Particle weight;
 60   
 61   The histograms are managed by G4AnalysisManager class and its Messenger. 
 62   The histos can be individually activated with the command :
 63   /analysis/h1/set id nbBins  valMin valMax unit 
 64   where unit is the desired unit for the histo (MeV or keV, deg or mrad, etc..)
 65    
 66   One can control the name of the histograms file with the command:
 67   /analysis/setFileName  name  (default exgps)
 68    
 69   It is possible to choose the format of the histogram file : root (default),
 70   xml, csv, by using namespace in HistoManager.hh 
 71   
 72 
 73   6 - GETTING STARTED
 74  
 75   - execute exgps in 'batch' mode from macro files
 76   % exgps   exgps.in
 77     
 78   - execute exgps in 'interactive mode' with visualization
 79   % exgps
 80   ....
 81   Idle> type your commands
 82   ....
 83   Idle> exit
 84 
 85  7 - FURTHER EXAMPLES of MACRO FILES
 86 
 87  There are a number of mac files in the ./macros subdirectory, to show the 
 88  various features of GPS. 
 89  Please see README file there for further informations.
 90 
 91 
 92