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0001 =========================================================
0002 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
0003 =========================================================
0004
0005 GFLASHa Example
0006 ---------------
0007
0008 The Example demonstrating usage 'gflash' shower parameterisation
0009 in homogeneous calorimeter.Compare with glash1,2,3 in this
0010 example histograms was added. This makes it possible to use this
0011 example for fine tuning of GFLASH parameters.
0012 This example allow compare the shower profiles from fast simulation
0013 with full simulation by histograming of longitudinal (slice)
0014 and radial profiles with different "binning".
0015 Then GFlash fast simulation can be "tuned" via modification
0016 of the model parameters file:
0017
0018 include/ExGflashHomoShowerTuning.hh
0019
0020 in this example.
0021
0022 PHYSICS LIST
0023 ------------
0024
0025 The Physics list factory is used in this example.
0026 The default physics list is FTFP_BERT which has EM opt0.
0027 Additionally the G4FastSimulationPhysics physics
0028 constructor was created to insert the G4FastSimulationManager Process
0029 that is making the interface between the fast simulation and the tracking.
0030
0031 THe default PHYSICS list may be changed via setting of the PHYSLIST environment
0032 variable, e.g:
0033
0034 export PHYSLIST=FTFP_BERT_EMZ # for FTFP_BERT with opt 4 EM physics
0035
0036
0037 GEOMETRY DEFINITION
0038 -------------------
0039
0040 In this example the calorimeter is a simple cube,
0041 which consists of 10 x 10 crystals of PbWO4 (CMS like).
0042
0043 Geometry, sensitive detector and hits are defined respectively in:
0044 ExGflashDetectorConstruction
0045 ExGflashSensitiveDetector
0046 ExGflashHit
0047
0048 Materials can be choosen from Nist Materials: G4_Air G4_WATER ...
0049 eg: /exgflash/det/setMat G4_PbWO4 see also: csi1.mac
0050
0051 HIT SCORING
0052 -----------
0053
0054 The virtual cylinder sliced longitudinally (slice) and radially (ring) was used.
0055 The size of the slices and rings are expressed in radiation
0056 length units and can be changed.
0057 eg: /exgflash/det/setLbin 20 1. ---> 20 slices of 1. radl
0058 /exgflash/det/setRbin 5 0.25 ---> 5 rings of 0.25 radl
0059
0060 (MaxBin = 500 in both directions)
0061
0062 In ExGflashEventAction class the arrays corresponded slices and rings was
0063 created and filled with hists information. This arrays was use to fill
0064 histograms later.
0065
0066 VISUALIZATION
0067 -------------
0068
0069 The Visualization Manager is set in the main().
0070 The initialization of the drawing is done via the commands /vis/...
0071 in the macro vis.mac. To get visualization:
0072 /control/execute vis.mac
0073
0074
0075 HOW TO START ?
0076 --------------
0077
0078 - Execute ExGflasha in 'batch' mode from macro files
0079 % ExGflasha test.mac
0080
0081 - Execute ExGflasha in 'interactive mode' with visualization
0082 % ExGflasha
0083 ....
0084 Idle> type your commands
0085 ....
0086 Idle> exit
0087
0088 The GFLASH activated via:
0089
0090 /GFlash/flag 1
0091
0092 HISTOGRAMS
0093 ----------
0094
0095 ExGflasha produces several histograms:
0096 The histograms defined in ExGflashHistoManager class
0097
0098 Content of these histo:
0099
0100 h0 : energy deposit per event
0101 h1 : the number of hits per event
0102 h2 : the energy per hit ( in MeV )
0103
0104 p0 : longitudinal energy profile
0105 p1 : radial energy profile
0106
0107 p2 : cumulated longitudinal energy profile
0108 p3 : cumulated radial energy profile
0109
0110 To define the output file name with histograms, use the UI command :
0111
0112 "/analysys/setFileName name"
0113
0114 MACROS
0115 ------
0116 The macros to run in batch mode:
0117
0118 test.mac - default macro for example testing
0119
0120 run01.mac - show how redefine the histograms
0121
0122 csi1.mac - macro which produce profiles in CsI Material
0123
0124 test0.mac - profile comparison, long run without GFLASH
0125 test1.mac - profile comparison, long run with GFLASH on
