| Geant4 Cross Reference |
1 ----------------------------------------------
2
3 =========================================
4 Geant4 - an Object-Oriented Toolkit for S
5 =========================================
6
7 TestEm4
8 -------
9
10 Plot energy deposited by 9 MeV photon beam in
11
12 1- GEOMETRY DEFINITION
13
14 It is a cylinder of 5 cm radius filled with
15
16 2- PHYSICS LIST
17
18 The particle list contains only gamma, elect
19 The physics list contains the 'standard' ele
20
21 3- AN EVENT : THE PRIMARY GENERATOR
22
23 The primary kinematic is a single 9 MeV gamm
24 middle of the cylinder.
25
26 4- VISUALIZATION
27
28 The Visualization Manager is set in the main
29 The initialisation of the drawing is done vi
30 /vis/.. in the macro vis.mac. This macro is
31 automatically read from the main in case of
32
33 The detector has a default view which is a t
34 cylinder.
35
36 The tracks are drawn at the end of event, an
37 Optionaly one can choose to draw all particl
38 or none. This command is defined in EventAct
39
40 5- PHYSICS SURVEY
41
42 The energy deposited in C6F6 is histogramed
43
44 6- HOW TO START ?
45
46 - execute TestEm4 in 'batch' mode from macro
47 % TestEm4 TestEm4.in
48
49 - execute TestEm4 in 'interactive mode' with
50 % TestEm4
51 ....
52 Idle> type your commands
53 ....
54 Idle> exit
55
56 macro verbose.mac illustrate capabili
57
58 7- USING HISTOGRAMS
59
60 The format of the histogram file can be : roo
61 xml, csv, by selecting g4nnn.hh in RunAction.
62
63 8- RANDOM NUMBERS HANDLING
64
65 CLHEP provides several random number engine
66 engine is choosen at beginning of the main
67
68 By default, G4RunManager does not save the
69 To do so the user must set in BeginOfRunAct
70 G4RunManager::GetRunManager()->SetRandomNum
71
72 Then the rndm seed is systematically saved
73 (currentRun.rndm) and beginning of event (c
74 Therefore, in case of abnormal end, the see
75 is available in currentEvent.rndm
76
77 Even in case of normal run processing, the
78 rndm seed of selected events. At any time i
79 following statement:
80 if (condition) G4RunManager::GetRunManager(
81 currentEvent.rndm will be copied to runXXev
82 (see SteppingAction::UserSteppingAction() )
83
84 To restart a run from a given rndm seed, us
85 /random/resetEngineFrom fileName
86
87 The macro rndmSeed.mac shows how to save an
88 seed between runs, from UI commands.