| Geant4 Cross Reference |
>> 1 $Id: README,v 1.15 2004/09/24 14:41:19 maire Exp $
1 ---------------------------------------------- 2 -------------------------------------------------------------------
2 3
3 ========================================= 4 =========================================================
4 Geant4 - an Object-Oriented Toolkit for S 5 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
5 ========================================= 6 =========================================================
6 7
7 TestEm4 8 TestEm4
8 ------- 9 -------
9 10
10 Plot energy deposited by 9 MeV photon beam in << 11 This example has been setup to test the low energy gamma processes.
11 12
12 1- GEOMETRY DEFINITION 13 1- GEOMETRY DEFINITION
13 14
14 It is a cylinder of 5 cm radius filled with 15 It is a cylinder of 5 cm radius filled with C6F6.
15 16
16 2- PHYSICS LIST 17 2- PHYSICS LIST
17 18
18 The particle list contains only gamma, elect 19 The particle list contains only gamma, electron,positron.
19 The physics list contains the 'standard' ele 20 The physics list contains the 'standard' electromagnetic processes.
20 21
21 3- AN EVENT : THE PRIMARY GENERATOR 22 3- AN EVENT : THE PRIMARY GENERATOR
22 23
23 The primary kinematic is a single 9 MeV gamm 24 The primary kinematic is a single 9 MeV gamma randomly shooted at the
24 middle of the cylinder. 25 middle of the cylinder.
25 26
26 4- VISUALIZATION 27 4- VISUALIZATION
27 28
28 The Visualization Manager is set in the main 29 The Visualization Manager is set in the main().
29 The initialisation of the drawing is done vi 30 The initialisation of the drawing is done via the commands
30 /vis/.. in the macro vis.mac. This macro is 31 /vis/.. in the macro vis.mac. This macro is
31 automatically read from the main in case of 32 automatically read from the main in case of interactive running mode.
32 33
33 The detector has a default view which is a t 34 The detector has a default view which is a transversal view of the
34 cylinder. 35 cylinder.
35 36
36 The tracks are drawn at the end of event, an 37 The tracks are drawn at the end of event, and erased at the end of run.
37 Optionaly one can choose to draw all particl 38 Optionaly one can choose to draw all particles, only the charged one,
38 or none. This command is defined in EventAct 39 or none. This command is defined in EventActionMessenger class.
39 40
40 5- PHYSICS SURVEY 41 5- PHYSICS SURVEY
41 42
42 The energy deposited in C6F6 is histogramed 43 The energy deposited in C6F6 is histogramed.
43 44
44 6- HOW TO START ? 45 6- HOW TO START ?
45 46
>> 47 - compile and link to generate an executable
>> 48 % cd examples/extended/electromagnetic/TestEm4
>> 49 % gmake
>> 50
46 - execute TestEm4 in 'batch' mode from macro 51 - execute TestEm4 in 'batch' mode from macro files
47 % TestEm4 TestEm4.in << 52 % TestEm4 run01.mac
48 53
49 - execute TestEm4 in 'interactive mode' with 54 - execute TestEm4 in 'interactive mode' with visualization
50 % TestEm4 55 % TestEm4
51 .... 56 ....
52 Idle> type your commands 57 Idle> type your commands
53 .... 58 ....
54 Idle> exit 59 Idle> exit
55 << 60
56 macro verbose.mac illustrate capabili << 61 - visualize the histogram (paw)
>> 62 paw> h/file 1 testem4.paw
>> 63 paw> option stat
>> 64 paw> option logy
>> 65 paw> h/pl 1
57 66
58 7- USING HISTOGRAMS << 67 Note that, by default, histograms are disabled. To activate them, uncomment
>> 68 the flag G4ANALYSIS_USE in GNUmakefile.
>> 69
59 70
60 The format of the histogram file can be : roo << 71 7- Using histograms
61 xml, csv, by selecting g4nnn.hh in RunAction. << 72 -------------------
62 73
63 8- RANDOM NUMBERS HANDLING << 74 By default the histograms are not activated. To activate histograms
64 << 75 the environment variable G4ANALYSIS_USE should be defined. For instance
65 CLHEP provides several random number engine << 76 uncomment the flag G4ANALYSIS_USE in GNUmakefile.
66 engine is choosen at beginning of the main << 77
67 << 78 To use histograms any of implementations of AIDA interfaces should
68 By default, G4RunManager does not save the << 79 be available (see http://aida.freehep.org).
69 To do so the user must set in BeginOfRunAct << 80
70 G4RunManager::GetRunManager()->SetRandomNum << 81 A package including AIDA and extended interfaces also using Python
71 << 82 is PI, available from: http://cern.ch/pi .
72 Then the rndm seed is systematically saved << 83
73 (currentRun.rndm) and beginning of event (c << 84 Once installed PI or PI-Lite in a specified local area $MYPY, it is
74 Therefore, in case of abnormal end, the see << 85 required to add the installation path to $PATH, i.e. for example,
75 is available in currentEvent.rndm << 86 for release 1.2.1 of PI:
76 << 87
77 Even in case of normal run processing, the << 88 setenv PATH ${PATH}:$MYPI/1.2.1/app/releases/PI/PI_1_2_1/rh73_gcc32/bin
78 rndm seed of selected events. At any time i << 89
79 following statement: << 90 CERN users can use the PATH to the LCG area on AFS.
80 if (condition) G4RunManager::GetRunManager( << 91
81 currentEvent.rndm will be copied to runXXev << 92 Before compilation of the example it is optimal to clean up old
82 (see SteppingAction::UserSteppingAction() ) << 93 files:
83 << 94
84 To restart a run from a given rndm seed, us << 95 gmake histclean
85 /random/resetEngineFrom fileName << 96 gmake
86 << 97
87 The macro rndmSeed.mac shows how to save an << 98 Before running the example the command should be issued:
88 seed between runs, from UI commands. << 99
>> 100 eval `aida-config --runtime csh`
>> 101
>> 102 It is possible to choose the format of the histogram file (hbook, root, XML):
>> 103 comment/uncomment 1 line in the constructor of RunAction.