| Geant4 Cross Reference |
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2
3 =========================================
4 Geant4 - an Object-Oriented Toolkit for S
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6
7 TestEm18
8 --------
9 This example allows to study the various c
10 by a charged particle in a single layer of
11 See any textbook of interactions of charge
12 1- geant4.web.cern.ch --> UserSupport --
13 2- lappweb.in2p3.fr/~maire/tutorials/ind
14
15 1- GEOMETRY DEFINITION
16
17 It is a simple cubic box of homogeneous ma
18 Two parameters define the geometry :
19 - the material of the box,
20 - the thickness of the box.
21
22 The default geometry (1 cm of water) is co
23 but the above parameters can be changed in
24 defined in DetectorMessenger.
25
26 2- PHYSICS
27
28 The physics list contains the 'standard' e
29 However the MultipleScattering is not regi
30 fluctuations of to energy loss alone.
31
32 3- BEAM
33
34 The primary kinematic is a single particle
35 of the box. The type of the particle and i
36 PrimaryGeneratorAction (e- 10 MeV), and ca
37 build-in commands of ParticleGun class.
38
39 4- RUN
40
41 During the tracking of the incident partic
42 particles are immediately killed, after th
43 (see SteppingAction and StackingAction).
44 Therefore, we study here the various compo
45 by the incident particle, not the energy d
46 thickness.
47 With the option /testEm/trackSecondaries o
48 deposited in the layer. See edep.mac
49
50 At EndOfRun, the above results are compare
51 i.e. the input data read from EnergyLoss a
52 See reference 2 : Energy-Range relation, s
53
54 5- HISTOGRAMS
55
56 The test contains 13 built-in 1D histogram
57 G4AnalysisManager and its Messenger.
58
59 1 step size of primary track
60 2 energy continuously deposited al
61 3 energy transfered to secondaries
62 4 energy transfered to secondaries
63 5 energy transfered to secondaries
64 6 total energy transfered to secon
65 7 total energy lost by primary tra
66 8 total energy lost by primary tra
67 9 energy continuously deposited al
68 10 total energy deposited
69 11 energy spectrum of gamma
70 12 energy spectrum of e-
71 13 energy spectrum of e+
72
73 The histograms are defined in HistoManager
74
75 The histos can be activated individually w
76 /analysis/h1/set id nbBins valMin valMax u
77 where 'unit' is the desired unit for the h
78
79 One can control the name of the histograms
80 /analysis/setFileName name (default test
81
82 It is possible to choose the format of the
83 xml, csv, by using namespace in HistoManag
84 For convenience, few simple Root macros ar
85 It is also possible to print selected hist
86 /analysis/h1/setAscii id
87 All selected histos will be written on a f
88
89 6- VISUALIZATION
90
91 The Visualization Manager is set in the ma
92 The initialisation of the drawing is done
93 /vis/... in the macro vis.mac. To get visu
94 > /control/execute vis.mac
95
96 The detector has a default view which is a
97 The tracks are drawn at the end of event,
98
99 7- HOW TO START ?
100
101 execute TestEm18 in 'batch' mode from macr
102 % TestEm18 electron.mac
103
104 execute TestEm18 in 'interactive mode' wit
105 % TestEm18
106 Idle> control/execute vis.mac
107 ....
108 Idle> type your commands
109 ....
110 Idle> exit
111
112 Macros provided in this example:
113 - csda.mac: test independance of user step m
114 - edep.mac: track secondary particles and pl
115 - electron.mac: e- (10 MeV) on 1 cm of water
116 - ion.mac: ion C12 (4 GeV) on 1 cm of water
117 - muon.mac: mu+ (1 TeV) on 1 m of water
118 - pixe.mac: proton (20 MeV) on 50 um of gold
119 - proton.mac: proton (1 GeV) on 10 cm of wat
120 - plotHisto.C, pixe.C: Root macros
121
122 Macros to be run interactively:
123 - vis.mac: To activate visualization