| Geant4 Cross Reference |
1 ---------------------------------------------- 1 -------------------------------------------------------------------
2 2
3 ========================================= 3 =========================================================
4 Geant4 - an Object-Oriented Toolkit for S 4 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
5 ========================================= 5 =========================================================
6 6
7 TestEm15 7 TestEm15
8 -------- 8 --------
9 9
10 How to compute and plot the final stat << 10 How to compute and plot the final state of Multiple Scattering
11 - Multiple Scattering << 11 or Gamma Conversion considered as an isolated processes.
12 - Gamma Conversion << 12 The method is exposed below : see item Physics.
13 considered as an isolated processes, see PHY << 13
14 <<
15 For Multiple Scattering, the method is expos <<
16 <<
17 For Gamma Conversion, when G4BetheHeitler5DM <<
18 see README.gamma for Histograms and UI comma <<
19 <<
20 1- GEOMETRY DEFINITION 14 1- GEOMETRY DEFINITION
21 << 15
22 It is a single box representing a 'sem 16 It is a single box representing a 'semi infinite' homogeneous medium.
23 Two parameters define the geometry: << 17 Two parameters define the geometry :
24 - the material of the box, 18 - the material of the box,
25 - the (full) size of the box. 19 - the (full) size of the box.
26 << 20
27 The default geometry (100 m of water) << 21 The default geometry (100 m of water) is constructed in
28 DetectorConstruction, but the above pa << 22 DetectorConstruction, but the above parameters can be changed
29 interactively via the commands defined 23 interactively via the commands defined in DetectorMessenger.
30 << 24
31 2- PHYSICS LIST 25 2- PHYSICS LIST
32 << 26
33 The physics list contains the standard 27 The physics list contains the standard electromagnetic processes.
34 In order not to introduce 'artificial' << 28 In order not to introduce 'artificial' constraints on the step size,
35 there is no limitation from the maximu << 29 there is no limitation from the maximum energy lost per step.
36 << 30
37 3- AN EVENT: THE PRIMARY GENERATOR << 31 3- AN EVENT : THE PRIMARY GENERATOR
38 << 32
39 The primary kinematic consists of a si 33 The primary kinematic consists of a single particle starting at the edge
40 of the box. The type of the particle a << 34 of the box. The type of the particle and its energy are set in
41 PrimaryGeneratorAction (1 MeV electron << 35 PrimaryGeneratorAction (1 MeV electron), and can be changed via the G4
42 build-in commands of ParticleGun class << 36 build-in commands of ParticleGun class (see the macros provided with
43 this example). 37 this example).
44 << 38
45 4- PHYSICS 39 4- PHYSICS
46 << 40
47 All discrete processes are inactivated 41 All discrete processes are inactivated (see provided macros),
48 so that Multiple Scattering or Gamma C 42 so that Multiple Scattering or Gamma Conversion is 'forced' to
49 determine the first step of the primar 43 determine the first step of the primary particle.
50 The step size and the final state are 44 The step size and the final state are computed and plotted.
51 Then the event is immediately killed. 45 Then the event is immediately killed.
52 << 46
53 Multiple Scattering: << 47 The result is compared with the 'input' data, i.e. with the cross
54 <<
55 The result is compared with the 'input' data <<
56 sections stored in the PhysicsTables a 48 sections stored in the PhysicsTables and used by Geant4.
>> 49
57 The stepMax command provides an additi 50 The stepMax command provides an additional control of the step size of
58 the multiple scattering. 51 the multiple scattering.
59 << 52
60 53
61 5- HISTOGRAMS 54 5- HISTOGRAMS
62 << 55
63 The test contains 16 built-in 1D histo << 56 The test contains 16 built-in 1D histograms, which are managed by
64 G4AnalysisManager and its Messenger. T << 57 G4AnalysisManager and its Messenger. The histos can be individually
65 activated with the command: << 58 activated with the command :
66 /analysis/h1/set id nbBins valMin val << 59 /analysis/h1/set id nbBins valMin valMax unit
67 where unit is the desired unit for the 60 where unit is the desired unit for the histo (MeV or keV, etc..)
68 (see the macros xxxx.mac). 61 (see the macros xxxx.mac).
69 << 62
70 1 Multiple Scattering. True step 63 1 Multiple Scattering. True step length
71 2 Multiple Scattering. Geom step 64 2 Multiple Scattering. Geom step length
72 3 Multiple Scattering. Ratio geo 65 3 Multiple Scattering. Ratio geomSl/trueSl
73 4 Multiple Scattering. Lateral d 66 4 Multiple Scattering. Lateral displacement: radius
74 5 Multiple Scattering. Lateral d 67 5 Multiple Scattering. Lateral displac: psi_space
75 6 Multiple Scattering. Angular d 68 6 Multiple Scattering. Angular distrib: theta_plane
76 7 Multiple Scattering. Phi-posit 69 7 Multiple Scattering. Phi-position angle
77 8 Multiple Scattering. Phi-direc 70 8 Multiple Scattering. Phi-direction angle
78 9 Multiple Scattering. Correlati 71 9 Multiple Scattering. Correlation: cos(phiPos-phiDir)
79 72
80 10 Gamma Conversion. Open Angle * 73 10 Gamma Conversion. Open Angle * Egamma
81 11 Gamma Conversion. Log10(P reco 74 11 Gamma Conversion. Log10(P recoil)
82 12 Gamma Conversion. Phi P recoil 75 12 Gamma Conversion. Phi P recoil angle
83 13 Gamma Conversion. Phi P plus a 76 13 Gamma Conversion. Phi P plus angle
84 14 Gamma Conversion. 2 * cos(phip 77 14 Gamma Conversion. 2 * cos(phiplus + phiminus) Asymmetry
85 15 Gamma Conversion. E plus / E g 78 15 Gamma Conversion. E plus / E gamma
86 16 Gamma Conversion. Phi of Gamma 79 16 Gamma Conversion. Phi of Gamma Polarization
87 80
88 << 81
89 The histograms are managed by the HistoMana << 82 The histograms are managed by the HistoManager class and its Messenger.
90 The histos can be individually activated wi << 83 The histos can be individually activated with the command :
91 /analysis/h1/set id nbBins valMin valMax u << 84 /analysis/h1/set id nbBins valMin valMax unit
92 where unit is the desired unit for the hist 85 where unit is the desired unit for the histo (MeV or keV, deg or mrad, etc..)
93 << 86
94 One can control the name of the histograms 87 One can control the name of the histograms file with the command:
95 /analysis/setFileName name (default teste 88 /analysis/setFileName name (default testem15)
96 << 89
97 It is possible to choose the format of the 90 It is possible to choose the format of the histogram file : root (default),
98 hdf5, xml, csv, by changing the default fil << 91 hbook, xml, csv, by using namespace in HistoManager.hh
99 << 92
100 It is also possible to print selected histo 93 It is also possible to print selected histograms on an ascii file:
101 /analysis/h1/setAscii id 94 /analysis/h1/setAscii id
102 All selected histos will be written on a fi 95 All selected histos will be written on a file name.ascii (default testem15)
103 << 96
104 6- VISUALIZATION 97 6- VISUALIZATION
105 << 98
106 The Visualization Manager is set in th 99 The Visualization Manager is set in the main().
107 The initialization of the drawing is d 100 The initialization of the drawing is done via the commands
108 /vis/... in the macro vis.mac. To get 101 /vis/... in the macro vis.mac. To get visualization:
109 > /control/execute vis.mac 102 > /control/execute vis.mac
110 << 103
111 The detector has a default view which << 104 The detector has a default view which is a longitudinal view of the
112 box. 105 box.
113 << 106
114 The tracks are drawn at the end of eve 107 The tracks are drawn at the end of event, and erased at the end of run.
115 << 108
116 7- HOW TO START ? 109 7- HOW TO START ?
117 << 110
118 execute TestEm15 in 'batch' mode from << 111 execute TestEm15 in 'batch' mode from macro files :
119 % TestEm15 compt.mac 112 % TestEm15 compt.mac
120 << 113
121 execute TestEm15 in 'interactive mode' << 114 execute TestEm15 in 'interactive mode' with visualization :
122 % TestEm15 115 % TestEm15
123 Idle> control/execute vis.mac 116 Idle> control/execute vis.mac
124 .... 117 ....
125 Idle> type your commands 118 Idle> type your commands
126 .... 119 ....
127 Idle> exit 120 Idle> exit
128 << 121
129 8 - MACROS 122 8 - MACROS
130 The examples of macros for Multiple Sca 123 The examples of macros for Multiple Scattering:
131 electron.mac muon.mac proton.mac 124 electron.mac muon.mac proton.mac
132 125
133 The example of Gamma Conversion macro: << 126 The example of Gamma Conversion macro :
134 gamma.mac - gamma to e+ e- << 127 gamma.mac - gamma to e+ e-
135 gamma2mumu.mac gamma to mu+ mu- << 128 gamma2mumu.mac gamma to mu+ mu-