| Geant4 Cross Reference |
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4 Geant4 - an Object-Oriented Toolkit for S
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6
7 TestEm17
8 --------
9 This example is intended to check impl
10 of muon interactions: ionization, dire
11 pair production, bremsstrahlung, and mu-nucl
12 It allows to compute differential cross sect
13 energy transfered to secondaries), total cro
14 with analytic calculations.
15
16 1- GEOMETRY DEFINITION
17
18 It is a single box of homogeneous medium.
19 Two parameters define the geometry :
20 - the material of the box,
21 - the (full) size of the box.
22
23 The default geometry (1 m of Iron) is constr
24 DetectorConstruction, but the above paramete
25 interactively via the commands defined in De
26
27 2- PHYSICS LIST
28
29 The Physics List of the example uses the mai
30 (builder) called "local", which includ
31 processes under study. As an alternati
32 and "emstandard_opt4" constructors may
33
34 Default energy range for EM processes
35 is from 100*eV to 1000*PeV.
36
37 Optionally "muNucl" builder may be add
38 inelastic interaction.
39
40 3- AN EVENT : THE PRIMARY GENERATOR
41
42 The primary kinematic consists of a single p
43 of the box. The type of the particle and its
44 PrimaryGeneratorAction (mu+ 10 TeV), and can
45 build-in commands of ParticleGun class (see
46 this example).
47
48 4- PHYSICS
49
50 The incident particle is a muon. During the
51 particles are killed.
52
53 The number of interactions are plotted as a
54 transfered to the secondaries.
55 The total number of interactions is recorded
56 section computed from this.
57
58 At RunAction::EndOfRun(..), the above
59 calculations. The functions computing
60 provided by the G4 MEPhI group, and implemen
61
62 5- HISTOGRAMS
63
64 The test contains built-in 1D histograms for
65 Monte Carlo simulation, which are mana
66 and its Messenger:
67
68 1 Relative muon transferred energy dis
69 (log10(eps/Emu kin) for knock-on e
70 2 -"- direct (e+,e-) pair production
71 3 -"- bremsstrahlung by muons
72 4 -"- nuclear interaction by muons
73 5 ionistion for hadrons
74 6 (e+,e-) pair production by hadrons
75 7 bremsstrahlung by hadrons
76 8 direct mu+,mu- pair production by muons
77
78 The histos can be activated individually wit
79 /testem/histo/setHisto id nbBins valMin val
80 min and max values of log10(eps/Emu
81
82 At EndOfRun the corresponding histos for ana
83 automatically created and filled (histo 11 t
84
85 One can control the name and the type of the
86 the command:
87 /testem/histo/setFileName name (default te
88
89 6- VISUALIZATION
90
91 The Visualization Manager is set in the main
92 The initialisation of the drawing is done vi
93 /vis/... in the macro vis.mac. To get visual
94 > /control/execute vis.mac
95
96 The detector has a default view which is a l
97 box.
98
99 The tracks are drawn at the end of event, an
100
101 7- HOW TO START ?
102
103 execute TestEm17 in 'batch' mode from macro
104 % TestEm17 allproc.mac
105
106 execute TestEm17 in 'interactive mode' with
107 % TestEm17
108 Idle> control/execute vis.mac
109 ....
110 Idle> type your commands
111 ....
112 Idle> exit