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0002
0003 =========================================================
0004 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
0005 =========================================================
0006
0007 TestEm9
0008 -------
0009 Demonstrate electromagnetic physics in crystal calorimeters.
0010 How to define cut-per-region.
0011
0012 1- GEOMETRY DEFINITION
0013
0014 The geometry consists of the vertex detector (VD), the electromagnetic
0015 calorimeter (EM), and the muon identifier (MU). Detector layout along
0016 the Z axis.
0017
0018 VD consisted of 3 layers of Si with pads structured along the X axis.
0019 Between VD and EM there are 2 active absorbers (scintillators).
0020 EM is the matrix 5x5 of heavy crystals. MU consist of 2 active absorbers
0021 (scintillators) and the iron plate between.
0022
0023 2 regions additional to the World are defined: VertexDetector and
0024 MuonDetector. For testing purposes first absorber of MU is included in
0025 the region of VD.
0026
0027 Material of calorimeter and absorber can be choosen:
0028 Air Water lAr Al Fe BGO PbWO4 Pb.
0029 eg: /testem/det/CalMat PbWO4
0030 /testem/det/AbsMat Al
0031
0032 The size of the detector can be changed also.
0033
0034 eg: /testem/det/EcalLength 20 cm
0035 /testem/det/EcalWidth 5 cm
0036 /testem/det/update ---> rebuild the geometry
0037
0038 2- PHYSICS LISTS
0039
0040 Physics Lists are based on modular design. Several modules are instantiated:
0041 1. Transportation
0042 2. EM physics
0043 3. Decays
0044 4. StepMax - for step limitation
0045
0046 The following options for EM physics using builders from physics_lists
0047 sub-package are available:
0048 - "emstandard_opt0" recommended standard EM physics for LHC
0049 - "emstandard_opt1" best CPU performance standard physics for LHC
0050 - "emstandard_opt2" similar fast simulation
0051 - "emstandard_opt3" best standard EM options - analog to "local" above
0052 - "emstandard_opt4" best current advanced EM options standard + lowenergy
0053 - "emstandardWVI" standard EM physics and WentzelVI multiple scattering
0054 - "emstandardSS" standard EM physics and single scattering model
0055 - "emstandardGS" standard EM physics and Goudsmit-Saunderson multiple scatt.
0056 - "emlivermore" low-energy EM physics using Livermore data
0057 - "empenelope" low-energy EM physics implementing Penelope models
0058 - "emlowenergy" low-energy EM physics implementing experimental
0059 low-energy models
0060
0061 A local builder, PhysListEmStandard "local" (similar to opt0) is also
0062 available.
0063
0064 Optional components can be added:
0065 - "elastic" elastic scattering of hadrons
0066 - "binary" QBBC configuration of hadron/ion inelastic models
0067 - "gamma_nuc" gamma- and electro-nuclear processes
0068 - "stopping" stopping processes
0069
0070 3- AN EVENT : THE PRIMARY GENERATOR
0071
0072 The primary kinematic consists of a single particle which hits the
0073 cylinder perpendicular to the input face. The type of the particle
0074 and its energy are set in the PrimaryGeneratorAction class, and can
0075 changed via the G4 build-in commands of G4ParticleGun class.
0076
0077 4- OUTPUT
0078
0079 The batch regime of simulation can be started
0080 $G4WORKDIR/bin/$G4SYSTEM/TestEm9 TestEm9.in
0081 where TestEm9.in is the example of macro file for batch job.
0082
0083 As a result of simulation the number of secondaries produced
0084 in different regions are averaged. The average energy depositions
0085 in active absorbers and EM as well as RMS of these values are shown.
0086 The number of hits in pads of VD is printed out.
0087
0088 5- VISUALISATION
0089
0090 To use visualisation the environment variable G4_VIS_USE should be
0091 defined. An interactive session starts if no macro file is specified
0092 in the command line:
0093 $G4WORKDIR/bin/$G4SYSTEM/TestEm9
0094
0095 To start visualisation one can issur
0096 >/control/execute vis.mac
0097 >/run/beamOn 1
0098
0099 6- ANALYSIS
0100
0101 Number of histograms are built inside the example using internal
0102 analysis sub-package. Histograms are saved in a root file.
0103 Histogram booking and saving is done only if any of histogram
0104
0105 /testem/histo/fileName myname
0106 /testem/histo/setHisto id nbins xmin xmax unit
0107
0108
