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1
2 =========================================================
3 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
4 =========================================================
5
6 Hadr06
7 ------
8
9 Survey energy deposition and particle's flux from an hadronic cascade.
10 Use PhysicsConstructor objects rather than predefined G4 PhysicsLists.
11
12
13 1- MATERIALS AND GEOMETRY DEFINITION
14
15 The geometry is a single sphere (absorber) of an homogenous material.
16
17 Two parameters define the geometry :
18 - the radius of the sphere
19 - the material of the sphere
20
21 The default geometry (R=30 cm of water) is built in
22 DetectorConstruction, but the above parameters can be changed interactively
23 via commands defined in DetectorMessenger.
24
25 The absorber is surrounded by a World volume (vacuum)
26
27 A function, and its associated UI command, allows to build a material
28 directly from a single isotope.
29
30 To be identified by the ThermalScattering module, the elements composing a
31 material must have a specific name (see G4ParticleHPThermalScatteringNames.cc)
32 Examples of such materials are build in DetectorConstruction.
33
34 2- PHYSICS LIST
35
36 "Full" set of physics processes are registered, but via PhysicsConstructor
37 objects rather than complete pre-defined G4 physics lists. This alternative
38 way gives more freedom to register physics.
39
40 Physics constructors are either constructors provided in Geant4 (with G4 prefix)
41 or 'local'. They include : HadronElastic, HadronInelastic, IonsInelastic, GammaNuclear,
42 RadioactiveDecay and Electomagnetic.
43 (see geant4/source/physics_lists/constructors)
44
45 HadronElasticPhysicsHP include a model for thermalized neutrons, under the control of a command
46 defined in NeutronHPMesseger.
47
48 GammmaNuclearPhysics is a subset of G4BertiniElectroNuclearBuilder.
49
50 ElectromagneticPhysics is a simplified version of G4EmStandardPhysics.
51
52 Several hadronic physics options are controlled by environment variables.
53 To trigger them, see Hadr06.cc
54
55 3- AN EVENT : THE PRIMARY GENERATOR
56
57 The primary kinematic is a single particle randomly shooted at the
58 centre of the sphere. The type of the particle and its energy are set in
59 PrimaryGeneratorAction (neutron 14 MeV), and can be changed via the G4
60 build-in commands of ParticleGun class (see the macros provided with
61 this example).
62
63 4- PHYSICS
64
65 The program computes and plots energy deposited in the interaction volume
66 (absorber) and the flux of particles leaving this volume.
67 Processes invoked and particles generated during hadronic cascade are listed.
68
69 5- HISTOGRAMS
70
71 The test contains 24 built-in 1D histograms:
72
73 1 "total energy deposit"
74 2 "Edep (MeV/mm) profile along radius"
75 3 "total kinetic energy flow"
76 4 "energy spectrum of gamma at creation"
77 5 "energy spectrum of e+- at creation"
78 6 "energy spectrum of neutrons at creation"
79 7 "energy spectrum of protons at creation"
80 8 "energy spectrum of deuterons at creation"
81 9 "energy spectrum of alphas at creation"
82 10 "energy spectrum of all others ions at creation"
83 11 "energy spectrum of all others baryons at creation"
84 12 "energy spectrum of all others mesons at creation"
85 13 "energy spectrum of all others leptons (neutrinos) at creation"
86 14 "energy spectrum of emerging gamma"
87 15 "energy spectrum of emerging e+-"
88 16 "energy spectrum of emerging neutrons"
89 17 "energy spectrum of emerging protons"
90 18 "energy spectrum of emerging deuterons"
91 19 "energy spectrum of emerging alphas"
92 20 "energy spectrum of all others emerging ions"
93 21 "energy spectrum of all others emerging baryons"
94 22 "energy spectrum of all others emerging mesons"
95 23 "energy spectrum of all others emerging leptons (neutrinos)"
96 24 "total energy released : edep + eflow"
97
98 The histograms are managed by the HistoManager class and its Messenger.
99 The histos can be individually activated with the command :
100 /analysis/h1/set id nbBins valMin valMax unit
101 where unit is the desired unit for the histo (MeV or keV, cm or mm, etc..)
102
103 One can control the name of the histograms file with the command:
104 /analysis/setFileName name (default Hadr06)
105
106 It is possible to choose the format of the histogram file : root (default),
107 xml, csv, by using namespace in HistoManager.hh
108
109 It is also possible to print selected histograms on an ascii file:
110 /analysis/h1/setAscii id
111 All selected histos will be written on a file name.ascii (default Hadr04)
112
113 6- VISUALIZATION
114
115 The Visualization Manager is set in the main().
116 The initialisation of the drawing is done via the commands
117 /vis/... in the macro vis.mac. To get visualisation:
118 > /control/execute vis.mac
119
120 The tracks are drawn at the end of event, and erased at the end of run.
121 gamma green
122 neutron yellow
123 negative particles (e-, ...) red
124 positive particles (e+, ions, ...) blue
125
126 7- HOW TO START ?
127
128 Execute Hadr06 in 'batch' mode from macro files :
129 % Hadr06 run1.mac
130
131 Execute Hadr06 in 'interactive mode' with visualization :
132 % Hadr06
133 Idle> control/execute vis.mac
134 ....
135 Idle> type your commands
136 ....
137 Idle> exit
138
139 Macros provided in this example:
140 - hadr06.in: macro used in Geant4 testing to produce hadr06.out
141 - graphite.mac: neutron,14 MeV, in graphite
142 - run1.mac: neutron,14 MeV, in Li7
143 - singleFission.mac: single fission in U235
144
145 Macros to be run interactively:
146 - debug.mac: water with thermal scattering
147 - fission.mac: U235
148 - vis.mac: To activate visualization
149
