| Geant4 Cross Reference |
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4 Geant4 - an Object-Oriented Toolkit for S
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6
7 Example B1
8 -----------
9
10 This example demonstrates a very simple appli
11 deposit is accounted in user actions and thei
12 and a dose in a selected volume is calculated
13
14
15 1- GEOMETRY DEFINITION
16
17 The geometry is constructed in the B1::Dete
18 The setup consists of a an envelope of box
19 volumes: a spherical cone and a trapezoid.
20
21 In this example we use some common materia
22 applications. The envelope is made of water
23 are made from tissue and bone materials.
24 The materials are created with the help of
25 which allows to build a material from the N
26 names. All available materials can be found
27 for Application Developers, Appendix 10: Ge
28
29 2- PHYSICS LIST
30
31 The particle's type and the physic processe
32 in this example are set in the QBBC physics
33 requires data files for electromagnetic and
34 See more on installation of the datasets in
35 Chapter 3.3: Note On Geant4 Datasets:
36 http://geant4.web.cern.ch/geant4/UserDocume
37 /In
38 The following datasets: G4LEDATA, G4LEVELGA
39 G4SAIDXSDATA and G4ENSDFSTATEDATA are manda
40
41 In addition the build-in interactive comman
42 /process/(in)activate processNa
43 allows to activate/inactivate the processes
44
45 3- ACTION INITALIZATION
46
47 A newly introduced class, B1::ActionInitial
48 to Geant4 kernel all user action classes.
49
50 While in sequential mode the action classes
51 via invoking the method:
52 B1::ActionInitialization::Build()
53 in multi-threading mode the same method is
54 and so all user action classes are defined
55
56 A run action class is instantiated both thr
57 and global that's why its instance is creat
58 B1::ActionInitialization::BuildForMaster
59 which is invoked only in multi-threading mo
60
61 4- PRIMARY GENERATOR
62
63 The primary generator is defined in the B1:
64 The default kinematics is a 6 MeV gamma, ra
65 of the envelope across 80% of the transvers
66 This default setting can be changed via the
67 of the G4ParticleGun class.
68
69 5- DETECTOR RESPONSE
70
71 This example demonstrates a simple scoring
72 in the user action classes. Alternative wa
73 can be found in the other examples.
74
75 The energy deposited is collected step by s
76 in B1::SteppingAction and accumulated event
77
78 At end of event, the value acummulated in B
79 and summed over the whole run (see B1::Even
80
81 Total dose deposited is computed at B1::Run
82 and printed together with informations abou
83 In multi-threading mode the energy accumula
84 workers is merged to the master in B1::RunA
85 result is printed on the screen.
86
87 G4Parameter<G4double> type instead of G4dou
88 data members in order to facilitate merging
89 to the master. Currently the accumulables
90 and G4AccumulablesManager::Merge() has to b
91 to be further simplified with a closer inte
92 the Geant4 kernel next year.
93
94 An example of creating and computing new un
95 in the class constructor.
96
97 The following paragraphs are common to all ba
98
99 A- VISUALISATION
100
101 The visualization manager is set via the G4
102 in the main() function in exampleB1.cc.
103 The initialisation of the drawing is done v
104 in the macro vis.mac. This macro is automat
105 the main function when the example is used
106
107 By default, vis.mac opens an OpenGL viewer
108 The user can change the initial viewer by c
109 and instead uncommenting one of the other /
110 HepRepFile or DAWNFILE (which produce files
111 HepRApp and DAWN viewers, respectively). N
112 open new viewers at any time from the comma
113 you already have a view in, say, an OpenGL
114 "viewer-0", then
115 /vis/open DAWNFILE
116 then to get the same view
117 /vis/viewer/copyView viewer-0
118 or to get the same view *plus* scene-modifi
119 /vis/viewer/set/all viewer-0
120 then to see the result
121 /vis/viewer/flush
122
123 The DAWNFILE, HepRepFile drivers are always
124 (since they require no external libraries),
125 that the Geant4 libraries have been built w
126
127 From Release 9.6 the vis.mac macro in examp
128 that demonstrate additional functionality o
129 displaying text, axes, scales, date, logo a
130 viewpoint and style. Consider copying thes
131 your application. To see even more command
132 ls or browse the available UI commands in t
133 Developers Guide, Section 7.1.
134
135 For more information on visualization, incl
136 install and run DAWN, OpenGL and HepRApp, s
137 for example,
138 http://geant4.slac.stanford.edu/Presentatio
139 (where [VIS] can be replaced by DAWN, OpenG
140
141 The tracks are automatically drawn at the e
142 for all events and erased at the beginning
143
144 B- USER INTERFACES
145
146 The user command interface is set via the G
147 in the main() function in exampleB1.cc
148 The selection of the user command interface
149 according to the Geant4 configuration or it
150 the third argument of the G4UIExecutive con
151
152 C- HOW TO RUN
153
154 - Execute exampleB1 in the 'interactive mo
155 % ./exampleB1
156 and type in the commands from run1.mac l
157 Idle> /control/verbose 2
158 Idle> /tracking/verbose 1
159 Idle> /run/beamOn 10
160 Idle> ...
161 Idle> exit
162 or
163 Idle> /control/execute run1.mac
164 ....
165 Idle> exit
166
167 - Execute exampleB1 in the 'batch' mode f
168 (without visualization)
169 % ./exampleB1 run2.mac
170 % ./exampleB1 exampleB1.in > exampleB1
171
172