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1 -------------------------------------------------------------------
2
3 =========================================================
4 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
5 =========================================================
6
7 OpNovice
8 --------
9
10 This example presently illustrates the following basic concepts, and in
11 particular (indicated with ***), how to use G4 for optical photon
12 generation and transport. Other extended example of what is possible
13 in Geant4 with optical photons can be found at
14 examples/extended/optical/LXe and wls.
15
16 main()
17 ------
18
19 ==> define Random Number generator initial seed
20
21 G4Optical Physics
22 -----------------
23
24 The G4OpticalPhysics physics class is used. The messenger is the
25 G4OpticalParametersMessenger class.
26
27 ==> define particles; including *** G4OpticalPhoton ***
28 define processes; including *** G4Cerenkov ***
29 *** G4Scintillation ***
30 *** G4OpAbsorption ***
31 *** G4OpRayleigh ***
32 *** G4OpBoundaryProcess ***
33
34 ==> A messenger command allows to define interactively the
35 verbose level and the maximum number of Cerenkov photons per step
36 (see for instance OpNovice.in)
37
38 G4VUserDetectorConstruction
39 ---------------------------
40
41 ==> define material: Air and Water
42 define simple G4box geometry
43 *** add G4MaterialPropertiesTable to G4Material ***
44 *** define G4LogicalSurface(s) ***
45 *** define G4OpticalSurface ***
46 *** add G4MaterialPropertiesTable to G4OpticalSurface ***
47
48 alternatively the Configuration can be read from a gdml file.
49 The provided gdml file NoviceExample.gdml corresponds to the detector
50 defined in OpNoviceDetectorConstruction.
51
52 G4VUserPrimaryGeneratorAction
53 -----------------------------
54
55 ==> Use G4ParticleGun to shoot a charge particle into a Cerenkov radiator
56
57 ==> A messenger command allows to define interactively the polarization of an
58 primary optical photon (see for instance optPhoton.mac)
59
60 G4UserRunAction and G4Run
61 -------------------------
62
63 Used to accumulate statistics.
64
65 G4UserStackingAction and G4UserEventAction
66 ------------------------------------------
67
68 ==> show how to count the number of secondary particles in an event
69
70 Visualisation
71 -------------
72
73 The Visualization Manager is set in the main().
74 The initialisation of the drawing is done via a set of /vis/ commands
75 in the macro vis.mac. This macro is automatically read from
76 the main in case of interactive running mode.
77
78 The detector has a default view which is a longitudinal view of the tank.
79 The tracks are drawn at the end of event, and erased at the end of run.
80
81 HOW TO START
82 ------------
83
84 - compile and link to generate an executable
85
86 This example handles the program arguments in a new way.
87 It can be run with the following optional optionaarguments:
88 $ OpNovice [-g gdmlfile] [-m macro ] [-u UIsession] [-t nThreads]
89
90 The -t option is available only in multi-threading mode
91 and it allows the user to override the Geant4 default number of
92 threads. The number of threads can be also set via G4FORCENUMBEROFTHREADS
93 environment variable which has the top priority.
94
95 - execute OpNovice in 'batch' mode from macro files
96 $ OpNovice -m OpNovice.in
97
98 - execute OpNovice in 'batch' mode from macro files using a gdml file
99 to define the geometry
100 $ OpNovice -g NoviceExample.gdml -m OpNovice.in
101
102 - execute OpNovice in 'interactive mode' with visualization
103 $ OpNovice
104 ....
105 Idle> type your commands. For instance:
106 Idle> /control/execute optPhoton.mac
107 ....
108 Idle> exit
109
110 Macros
111 ------
112
113 The following macros are provided:
114
115 - optPhoton.mac: Shoot optical photons with energy 3 eV
116 - OpNovice.in: Shoot positrons with energy 500 keV.
117 - gui.mac: Configure the graphical user interface.
118 - vis.mac: Configure visualization.
119
120
121 gdml files
122 ----------
123 NoviceExample.gdml: example gdml file corresponding to
124 OpNoviceDetectorConstruction
