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1 -------------------------------------------------------------------
2
3 =========================================================
4 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
5 =========================================================
6
7 TestEm4
8 -------
9
10 Plot energy deposited by 9 MeV photon beam in an homogeneous medium.
11
12 1- GEOMETRY DEFINITION
13
14 It is a cylinder of 5 cm radius filled with C6F6.
15
16 2- PHYSICS LIST
17
18 The particle list contains only gamma, electron,positron.
19 The physics list contains the 'standard' electromagnetic processes.
20
21 3- AN EVENT : THE PRIMARY GENERATOR
22
23 The primary kinematic is a single 9 MeV gamma randomly shooted at the
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 via the commands
30 /vis/.. in the macro vis.mac. This macro is
31 automatically read from the main in case of interactive running mode.
32
33 The detector has a default view which is a transversal view of the
34 cylinder.
35
36 The tracks are drawn at the end of event, and erased at the end of run.
37 Optionaly one can choose to draw all particles, only the charged one,
38 or none. This command is defined in EventActionMessenger class.
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 files
47 % TestEm4 TestEm4.in
48
49 - execute TestEm4 in 'interactive mode' with visualization
50 % TestEm4
51 ....
52 Idle> type your commands
53 ....
54 Idle> exit
55
56 macro verbose.mac illustrate capability of verbosity
57
58 7- USING HISTOGRAMS
59
60 The format of the histogram file can be : root (default),
61 xml, csv, by selecting g4nnn.hh in RunAction.hh
62
63 8- RANDOM NUMBERS HANDLING
64
65 CLHEP provides several random number engines. In this example the Ranecu
66 engine is choosen at beginning of the main (TestEm4.cc).
67
68 By default, G4RunManager does not save the rndm seed.
69 To do so the user must set in BeginOfRunAction:
70 G4RunManager::GetRunManager()->SetRandomNumberStore(true);
71
72 Then the rndm seed is systematically saved at beginning of run
73 (currentRun.rndm) and beginning of event (currentEvent.rndm)
74 Therefore, in case of abnormal end, the seed of the last event processed
75 is available in currentEvent.rndm
76
77 Even in case of normal run processing, the user may wish to preserve the
78 rndm seed of selected events. At any time in the event, put the
79 following statement:
80 if (condition) G4RunManager::GetRunManager()->rndmSaveThisEvent();
81 currentEvent.rndm will be copied to runXXevntYY.rndm
82 (see SteppingAction::UserSteppingAction() )
83
84 To restart a run from a given rndm seed, use the UI command :
85 /random/resetEngineFrom fileName
86
87 The macro rndmSeed.mac shows how to save and reset the random number
88 seed between runs, from UI commands.
