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1 -------------------------------------------------------------------
2
3 =========================================================
4 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
5 =========================================================
6
7 TestEm17
8 --------
9 This example is intended to check implementation of the processes
10 of muon interactions: ionization, direct (e+,e-) production, mu+mu-
11 pair production, bremsstrahlung, and mu-nuclear interaction.
12 It allows to compute differential cross sections (as function of the
13 energy transfered to secondaries), total cross sections, and to compare
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 constructed in
24 DetectorConstruction, but the above parameters can be changed
25 interactively via the commands defined in DetectorMessenger.
26
27 2- PHYSICS LIST
28
29 The Physics List of the example uses the main physics constructor
30 (builder) called "local", which includes only muon, pion, and proton
31 processes under study. As an alternative standard "emstandard_opt0"
32 and "emstandard_opt4" constructors may be used.
33
34 Default energy range for EM processes in this example
35 is from 100*eV to 1000*PeV.
36
37 Optionally "muNucl" builder may be added activating muon-nuclear
38 inelastic interaction.
39
40 3- AN EVENT : THE PRIMARY GENERATOR
41
42 The primary kinematic consists of a single particle starting at the edge
43 of the box. The type of the particle and its energy are set in
44 PrimaryGeneratorAction (mu+ 10 TeV), and can be changed via the G4
45 build-in commands of ParticleGun class (see the macros provided with
46 this example).
47
48 4- PHYSICS
49
50 The incident particle is a muon. During the tracking, secondary
51 particles are killed.
52
53 The number of interactions are plotted as a function of the energy
54 transfered to the secondaries.
55 The total number of interactions is recorded, and the total cross
56 section computed from this.
57
58 At RunAction::EndOfRun(..), the above results are compared with analytical
59 calculations. The functions computing the theoretical cross sections have been
60 provided by the G4 MEPhI group, and implemented in MuCrossSections class.
61
62 5- HISTOGRAMS
63
64 The test contains built-in 1D histograms for muons filled during
65 Monte Carlo simulation, which are managed by the HistoManager class
66 and its Messenger:
67
68 1 Relative muon transferred energy distribution
69 (log10(eps/Emu kin) for knock-on electrons (ionization)
70 2 -"- direct (e+,e-) pair production by muons
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 with the command :
79 /testem/histo/setHisto id nbBins valMin valMax :
80 min and max values of log10(eps/Emu kin).
81
82 At EndOfRun the corresponding histos for analytic calculations are
83 automatically created and filled (histo 11 to 14, and 18).
84
85 One can control the name and the type of the histograms file with
86 the command:
87 /testem/histo/setFileName name (default testem17)
88
89 6- VISUALIZATION
90
91 The Visualization Manager is set in the main().
92 The initialisation of the drawing is done via the commands
93 /vis/... in the macro vis.mac. To get visualisation:
94 > /control/execute vis.mac
95
96 The detector has a default view which is a longitudinal view of the
97 box.
98
99 The tracks are drawn at the end of event, and erased at the end of run.
100
101 7- HOW TO START ?
102
103 execute TestEm17 in 'batch' mode from macro files :
104 % TestEm17 allproc.mac
105
106 execute TestEm17 in 'interactive mode' with visualization :
107 % TestEm17
108 Idle> control/execute vis.mac
109 ....
110 Idle> type your commands
111 ....
112 Idle> exit
