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1 -------------------------------------------------------------------
2
3 =========================================================
4 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
5 =========================================================
6
7 monopole
8 --------
9 V.Ivanchenko, M.Vladymyrov
10 CERN, Geneva, Switzerland
11 Lebedev Physical Institute, Moscow, Russia
12
13
14 This example is devoted to the energy deposited by classical magnetic
15 monopole.
16
17
18
19 1- GEOMETRY DEFINITION
20
21 The geometry consists of a single block of a homogenous material,
22 placed in a world.
23
24 Four parameters define the geometry :
25 - the material of the box
26 - the thickness of the box
27 - the tranverse dimension of the box
28 - the maximal step size in target
29
30 The default is 10 cm of alumunium, step is limited by 5mm.
31 Equivalent UI commands are following:
32 /testex/det/setMat G4_Al
33 /testex/det/sizeX 10 cm
34 /testex/det/sizeYZ 5 cm
35 /testex/det/setStepSize 5 mm
36
37 The default geometry is constructed in DetectorConstruction class,
38 but all of the above parameters can be changed interactively via
39 the commands defined in the DetectorMessenger class.
40
41 In addition, a global, uniform, and transverse magnetic field can be applied
42 via G4MonopoleFieldSetup class, with the default z-value 0.2 tesla.
43 This value can be changed via UI command:
44 /testex/fld/setField 0.2 tesla
45
46 2- PHYSICS LIST
47
48 The physics list includes standard FTFP_BERT physics and the additional builder
49 or monopole physics.
50 To define monopole parameters an extra string should be provided via
51 the program arguments:
52 ./monopole -s '2 0 200 GeV' # in the interactive mode
53 ./monopole -m file.mac -s '2 0 200 GeV' # in the batch mode
54
55 3- AN EVENT : THE PRIMARY GENERATOR
56
57 The primary kinematic consists of a single particle which hits the
58 block perpendicular to the input face. The type of the particle
59 and its energy are set in the PrimaryGeneratorAction class, and can
60 changed via the G4 build-in commands of ParticleGun class (see
61 the macros provided with this example).
62 The default is monopole 100 GeV.
63
64 4- VISUALIZATION
65
66 The Visualization Manager is set in the main() for interactive session,
67 the initial parameters of the program are defined in the init_vis.mac macro
68 which then executes the visualisation macro, vis.mac.
69
70 The detector has a default view which is a longitudinal view of the box.
71
72 The tracks are drawn at the end of event, and erased at the end of run.
73
74
75 5- HOW TO RUN ?
76
77 This example handles the program arguments in a similar way as the basic
78 B4 example.
79 It can be run with the following optional arguments:
80 % ./monopole [-m macro ] [-s setupMonopole] [-t nThreads]
81
82 The -s option was already explained in the Physics list section.
83 The -t option is available only in multi-threading mode
84 and it allows the user to override the Geant4 default number of
85 threads. The number of threads can be also set via G4FORCENUMBEROFTHREADS
86 environment variable which has the top priority.
87
88 - Execute program in the 'batch' mode from macro files
89 % ./monopole -m monopole.in [-s setupMonopole]
90
91 - Execute program in the 'interactive mode' with visualization
92 % ./monopole [-s setupMonopole]
93 ....
94 Idle> type your commands
95 ....
96 Idle> exit
97
98
99 6- HISTOGRAMS
100
101 The result is five histograms:
102 - Monopole eneregy deposition in current material
103 - dedx for proton
104 - dedx for monopole
105 - range for proton in current material
106 - range for monopole in current material
107
108 The histogram is saved in Root file.
109 Limit of bin size can be set with testex/run/binSize (default 5mm). Real size
110 is chosen as a minimal between this and step limit (see Geometry section)
111
