| Geant4 Cross Reference |
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2
3 =========================================
4 Geant4 - an Object-Oriented Toolkit for S
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6
7 Example Par03
8 -------------
9
10 This example demonstrates how to use G4FastSi
11 to create multiple energy deposits from the f
12
13 It requires sensitive detector class to inher
14 - G4VSensitiveDetector: for processing of det
15 - G4VFastSimSensitiveDetector: for processing
16 Hits are placed in the same hit collection, s
17 compare between the full and the fast simulat
18
19 The geometry used in the example is a homogen
20 3D readout geometry (cylindrical). Analysis o
21 in the event action.
22
23 1. Detector description
24 -----------------------
25
26 The detector is a homogeneous cylinder of lea
27 z, R and phi to create a readout geometry in
28
29 Fast simulation is attached to the region of
30
31
32 2. Sensitive detector
33 -----------------------
34
35 Sensitive detector inherits from both base cl
36 - G4VSensitiveDetector: for processing of det
37 - G4VFastSimSensitiveDetector: for processing
38 Hits are placed in the same hit collection, w
39 between those originated in the full simulati
40 simulation.
41 During visualisation, hits are represented as
42 green for full simulation and red for fast si
43
44 3. Primary generation
45 ---------------------
46
47 Particle gun is used as a primary generator.
48 the axis of symmetry of the detector (cylinde
49 of the entrance to the detector. 10 GeV elect
50 can be changed using /gun/ UI commands.
51
52 4. Physics List
53 ---------------
54
55 FTFP_BERT modular physics list is used. On to
56 is registered for selected particles (electro
57
58
59 5. User actions
60 ---------------------------------------------
61
62 - Par03RunAction : run action used for initia
63 of the run. Histograms for
64 in the detector are create
65
66 - Par03EventAction : event action used for in
67 of the event. Analysis o
68 on event-by-event basis.
69
70 6. Output
71 ---------
72
73 The execution of the program (examplePar03) p
74
75 The macro file examplePar03.in specifies thre
76 events, for single 10 GeV electron beams. The
77 simulation model activated with defualt param
78 simulation with modified parameters. For the
79 is disactivated.
80 Three output files are produced: two with sho
81 simulation (with different parameters), and f
82
83 7. How to build and run the example
84 -----------------------------------
85
86 - Compile and link to generate the executable
87 % cmake <PAR03_SOURCE>
88 % make
89
90 - Execute the application (in batch mode):
91 % ./examplePar03 -m examplePar03.in
92 which produces three root files: Par03_fasts
93 Par03_fastsimModified_100events.root, and Pa
94
95 - Execute the application (in interactive mode
96 % ./examplePar03
97 which allows to visualize hits.
98
99 8. UI commands
100 --------------
101
102 UI commands useful in this example:
103
104 - activation/disactivation of the fast simulat
105 /param/ActivateModel model
106 /param/InActivateModel model
107
108 - particle gun commands
109 /gun/particle e+
110 /gun/energy 50 GeV
111 /gun/direction 0 0.2 1
112 /gun/position 0 0 0
113
114 UI commands defined in this example:
115 - detector settings
116 /Par03/detector/print
117 /Par03/detector/setDetectorRadius 10 cm
118 /Par03/detector/setDetectorLength 30 cm
119 /Par03/detector/setDetectorMaterial G4_Pb
120 /Par03/detector/setNbOfLayers 100
121 /Par03/detector/setNbOfPhiCells 20
122 /Par03/detector/setNbOfRhoCells 100
123
124 - fast simulation settings
125 /Par03/fastSim/print
126 /Par03/fastSim/transverseProfile/sigma 20 mm
127 /Par03/fastSim/longitudinalProfile/beta 0.6
128 /Par03/fastSim/longitudinalProfile/alpha 2.
129 /Par03/fastSim/longitudinalProfile/maxDepth
130 /Par03/fastSim/numberOfHits 500