| Geant4 Cross Reference |
1
2 =========================================
3 Geant4 - an Object-Oriented Toolkit for S
4 =========================================
5
6 lArCal
7 --------
8
9 This example is intended to simulate the Forw
10 (FCAL) of the ATLAS Detector at LHC. The goal
11 a good missing energy determination in the re
12 from the beam direction.
13
14
15 1. GEOMETRY DEFINITION
16 ------------------------
17
18 The liquid Argon calorimeter consists of thre
19 nominal outer dimensions: an electromagnetic
20 of copper) followed by two hadronic ones (mad
21 The corresponding parameters of these modules
22 FCALEMModuleParameters.input and FCALHadModul
23 The package contains as well a FCALTestbemSet
24 FCALTestbeamSetupParameters.input. See these
25 radius, lenght and angles of the different co
26
27
28 2. AN EVENT : THE PRIMARY GENERATOR
29 ------------------------------------
30
31 The primary kinematic consists of a single pa
32 geometry perpendicular to the input face. The
33 class gives the particle and its energy (by d
34 20 GeV). These parameters can be changed in c
35 inside the macros given in this example.
36
37 The subdirectory data-tracks contains the kin
38 of the particles for different energies (20 G
39 120 GeV and 200 GeV).
40 The information given inside these files are
41 cosY, cosZ variables for each event.
42
43 A RUN is a set of events.
44
45
46 3. VISUALIZATION
47 ------------------
48
49 The Visualization Manager is set in the main(
50 The initialisation of the drawing is done via
51 > /control/execute vis.mac
52
53 The detector has a default view which is a tr
54
55 The tracks are drawn at the end of event, and
56 Optionally the way of drawing the particles c
57 TBEVentActionMessenger class.
58
59
60 4. PHYSICS
61 ----------
62
63 You can select between 4 Physics Lists: QGSP,
64 The last one is set as default, so that you c
65 electromagnetic.
66 The selection is done simply by comment/uncom
67 lArCal.cc (look for the keyword ***LOOKHERE
68
69
70 5. HOW TO START ?
71 -----------------
72
73 - compile and link to generate an executable
74 % cd geant4/examples/advanced/lAr_calori
75 % gmake
76
77 - execute the program in 'batch' mode from m
78 % lArCal prerunlArcal.mac
79
80 - execute Test in 'interactive mode' with vi
81 % lArCal
82 ...
83 Idle> type your commands
84 ...
85 Idle> exit
86
87
88 6. HISTOGRAMS
89 --------------
90 The analysis is performed using the histogram
91 Geant4. No external dependencies are required
92
93 lArCal produces 4 histograms (saved as fcal.r
94 the final state of the most important variabl
95
96 Histo1 --> Number of tracks out of World
97 Histo2 --> Number of secondary particles
98 Histo3 --> Total energy deposited (in MeV) in
99 Histo4 --> Total energy deposited (in MeV) in
100
101 See their definitions in FCALRunAction.cc
102
103 The histograms are saved (default) as a ROOT
104 histograms in a xml file by changing the G4An
105 in the FCALRunAction constructor.
106