| Geant4 Cross Reference |
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4 Geant4 - an Object-Oriented Toolkit for S
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7 amsEcal
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9
10 1- GEOMETRY DEFINITION
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12 AMS Ecal calorimeter is described in the join
13
14 - A single layer is a plane of scintillating
15 absorber material.
16 - Single layers are positionned (eg. placemen
17 (called SuperLayer in the descriptive docum
18 alternatively with a relative offset of +-
19 - Modules are positionned within calorimeter,
20 90 deg around beam axis (X_axis).
21 Therefore all fibers are along Y_axis or Z_
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23 The default geometry is constructed in Detect
24 In addition a transverse uniform magnetic fie
25
26 2- PHYSICS LISTS
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28 Physics lists can be local (eg. in this exam
29 (physics_lists subdirectory).
30
31 - "local" standard EM physics with current '
32
33 From geant4/source/physics_lists/constructor
34 - "emstandard_opt0" standard EM physics wi
35 - "emstandard_opt1" best CPU performance s
36 - "emstandard_opt2"
37 - "emstandard_opt3"
38
39 Physics lists and options can be (re)set wit
40
41 Please, notice that options set through G4Em
42 for all particle types. In G4 constructors,
43 particle type.
44
45 3- PRIMARY GENERATOR : mono-energetic pencil
46
47 The primary kinematic is a single particle w
48 perpendicular to the input face (eg. along X
49 The type of particle and its energy are set
50 and can be changed via the G4 build-in comma
51 (see the macros provided with this example).
52
53 One can choose randomly the tranverse positi
54 eg. the width of the beam. The associated in
55 in PrimaryGeneratorMessenger.
56
57 4- DETECTOR RESPONSE
58
59 The program computes the 'visible' energy, e
60 in scintillating fibers.
61
62 It also computes the total energy deposited
63 material or in scintillator material.
64
65 The list of fibers fired can be written even
66 The file is filled at EndOfEvent(); uncommen
67 See EventAction::WriteFibers() and the forma
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69 NB: visible energy can be corrected for Birk
70 see the function SteppingAction::BirksAt
71
72 5- HISTOGRAMS
73
74 The Program contains 5 built-in 1D histogram
75 These histograms can be activated individual
76 /analysis/h1/set id nbBins valMin valMax un
77 where unit is the desired unit for the histo
78 (see the macros xxxx.mac).
79
80 1 total energy in calorimeter (eg. summed a
81 2 vsible energy in calorimeter (eg. summed a
82 3 total energy per layer (eg. longitudinal p
83 4 visible energy per layer (eg. longitudinal
84 5 visible energy per fiber (eg. lateral prof
85
86 Histograms can be viewed using ROOT.
87
88 One can control the name and format of the h
89 /analysis/setFileName name (default amsEca
90 /analysis/setFileType type (choice: root(d
91
92 It is also possible to print selected histog
93 /analysis/h1/setAscii id
94 All selected histos will be written on a fil
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96 6- VISUALIZATION
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98 Visualization Manager is set in the main().
99 Initialisation of the drawing is done via th
100 /vis/... in the macro vis.mac. In interactiv
101 PreInit or Idle > /control/execute vis.mac
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103 Default view is a longitudinal view of the c
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105 Tracks are drawn at end of event, and erased
106 Optionaly one can choose to draw all particl
107 This command is defined in EventActionMessen
108
109 7- HOW TO START ?
110
111 - compile and link to generate an executable
112 % cd amsEcal
113 % gmake
114
115 - execute amsEcal in 'batch' mode from macro
116 % amsEcal run1.mac
117
118 - execute amsEcal in 'interactive mode' with
119 % amsEcal
120 ....
121 Idle> type your commands. For instance:
122 Idle> /control/execute run1.mac
123 ....
124 Idle> exit
125
126 8- HANDLE RANDOM NUMBER SEEDS
127
128 The macro rndmSeed.mac shows how to create a
129 Here we save the seed at begin of each run (
130 is arbitrary). The seeds are stored in subdi
131
132 Macro rndmSeed.mac shows also how to start a