| Geant4 Cross Reference |
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2 =========================================
3 Geant4 - ULTRA-based air shower
4 =========================================
5
6 README
7 ---------------------
8
9 ----------------------------------------------
10 ----> Introduction.
11
12 The ULTRA detector is a hybrid 2-component sys
13
14
15 1) an UV detection system - the UVscope
16 2) an array of scintillator detectors - the ET
17
18 The UVscope detects Cherenkov light associated
19 when it is diffusively reflected on ground.
20 The ETscope detects in coincidence the charged
21
22 In the current version only the UVscope simula
23 ----------------------------------------------
24 ----> Description
25
26 The UVscope consists of a Fresnel lens and a P
27 plane, enclosed in a cylindrical aluminum hous
28 in diameter and is made of UV transmitting acr
29 per mm. The description of the geometry of the
30 of object parameterisation/replication capabil
31
32 The primary vertex generator describes a plane
33 (3eV, about 400 nm) optical photons.
34 Depending on the selected detector configurati
35 positioned such that the photons are fired
36 to a reflecting surface or, by default, direct
37 (no reflecting surface is present in this case
38 Reflection at the surface can be chosen to be
39 In both cases the normal to the surface makes
40 with the UVscope axis and the photons are emit
41 90 degrees with the UVscope axis.
42 If none of these variables is set no reflectin
43 and the photons source is positioned at the UV
44
45 The definition of the relevant optical boundar
46 processes is made.
47
48 ----------------------------------------------
49 ----> SET-UP
50
51 A standard Geant4 example GNUmakefile and a CM
52 provided, for building with cmake
53
54 The following environment variable can be set
55 additional verbosity during program running:
56
57 1) GNUmakefile
58
59 setenv ULTRA_VERBOSE
60
61 or
62
63 2) cmake -DULTRA_VERBOSE=ON "path to source"
64
65
66 ----------------------------------------------
67
68 The analysis is performed using the native Gea
69 (g4tools). In the default case, the output his
70 in a ROOT file.
71
72 The output file can be written in other format
73 changing the G4AnalysisManager default file ty
74
75 ----------------------------------------------
76 ----> How to run the example.
77
78 From the directory where the Ultra binary re
79
80 ./Ultra "macro name" for running in batch mo
81
82 ./Ultra for running in interative mode.
83 The macro VisDirect.mac is executed.
84
85 Several macros are available for interactive
86 While in interactive mode type the command
87 /control/execute "name_of_macro",
88 where "name_of_macro" is one of the followin
89
90 Direct.mac - a beam of photons is shot direc
91 Mirror.mac - the beam is directed to a specu
92 Ground.mac - the beam is directed to a diffu
93
94 ----------------------------------------------
95 ----> Simulation output
96
97 the output is ultra.root
98 It contains:
99 1)1Dhistogram with the detected photons energ
100 2)1Dhistogram with the number of detected pho
101
102
103 To plot these histograms run the ROOT macro 'd
104 > root do_plots.C
105 ----------------------------------------------
106
107 for comments and questions: bernardo@lip.pt
108 for more info http://www.ge.infn.it/geant4/exa
109
110 last modified: B. Tome 08/11/2019
111 created by : B. Tome and M.C. Espirito Sant