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0001
0002 =========================================================
0003 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
0004 =========================================================
0005
0006 Hadr06
0007 ------
0008
0009 Survey energy deposition and particle's flux from an hadronic cascade.
0010 Use PhysicsConstructor objects rather than predefined G4 PhysicsLists.
0011
0012
0013 1- MATERIALS AND GEOMETRY DEFINITION
0014
0015 The geometry is a single sphere (absorber) of an homogenous material.
0016
0017 Two parameters define the geometry :
0018 - the radius of the sphere
0019 - the material of the sphere
0020
0021 The default geometry (R=30 cm of water) is built in
0022 DetectorConstruction, but the above parameters can be changed interactively
0023 via commands defined in DetectorMessenger.
0024
0025 The absorber is surrounded by a World volume (vacuum)
0026
0027 A function, and its associated UI command, allows to build a material
0028 directly from a single isotope.
0029
0030 To be identified by the ThermalScattering module, the elements composing a
0031 material must have a specific name (see G4ParticleHPThermalScatteringNames.cc)
0032 Examples of such materials are build in DetectorConstruction.
0033
0034 2- PHYSICS LIST
0035
0036 "Full" set of physics processes are registered, but via PhysicsConstructor
0037 objects rather than complete pre-defined G4 physics lists. This alternative
0038 way gives more freedom to register physics.
0039
0040 Physics constructors are either constructors provided in Geant4 (with G4 prefix)
0041 or 'local'. They include : HadronElastic, HadronInelastic, IonsInelastic, GammaNuclear,
0042 RadioactiveDecay and Electomagnetic.
0043 (see geant4/source/physics_lists/constructors)
0044
0045 HadronElasticPhysicsHP include a model for thermalized neutrons, under the control of a command
0046 defined in NeutronHPMesseger.
0047
0048 GammmaNuclearPhysics is a subset of G4BertiniElectroNuclearBuilder.
0049
0050 ElectromagneticPhysics is a simplified version of G4EmStandardPhysics.
0051
0052 Several hadronic physics options are controlled by environment variables.
0053 To trigger them, see Hadr06.cc
0054
0055 3- AN EVENT : THE PRIMARY GENERATOR
0056
0057 The primary kinematic is a single particle randomly shooted at the
0058 centre of the sphere. The type of the particle and its energy are set in
0059 PrimaryGeneratorAction (neutron 14 MeV), and can be changed via the G4
0060 build-in commands of ParticleGun class (see the macros provided with
0061 this example).
0062
0063 4- PHYSICS
0064
0065 The program computes and plots energy deposited in the interaction volume
0066 (absorber) and the flux of particles leaving this volume.
0067 Processes invoked and particles generated during hadronic cascade are listed.
0068
0069 5- HISTOGRAMS
0070
0071 The test contains 24 built-in 1D histograms:
0072
0073 1 "total energy deposit"
0074 2 "Edep (MeV/mm) profile along radius"
0075 3 "total kinetic energy flow"
0076 4 "energy spectrum of gamma at creation"
0077 5 "energy spectrum of e+- at creation"
0078 6 "energy spectrum of neutrons at creation"
0079 7 "energy spectrum of protons at creation"
0080 8 "energy spectrum of deuterons at creation"
0081 9 "energy spectrum of alphas at creation"
0082 10 "energy spectrum of all others ions at creation"
0083 11 "energy spectrum of all others baryons at creation"
0084 12 "energy spectrum of all others mesons at creation"
0085 13 "energy spectrum of all others leptons (neutrinos) at creation"
0086 14 "energy spectrum of emerging gamma"
0087 15 "energy spectrum of emerging e+-"
0088 16 "energy spectrum of emerging neutrons"
0089 17 "energy spectrum of emerging protons"
0090 18 "energy spectrum of emerging deuterons"
0091 19 "energy spectrum of emerging alphas"
0092 20 "energy spectrum of all others emerging ions"
0093 21 "energy spectrum of all others emerging baryons"
0094 22 "energy spectrum of all others emerging mesons"
0095 23 "energy spectrum of all others emerging leptons (neutrinos)"
0096 24 "total energy released : edep + eflow"
0097
0098 The histograms are managed by the HistoManager class and its Messenger.
0099 The histos can be individually activated with the command :
0100 /analysis/h1/set id nbBins valMin valMax unit
0101 where unit is the desired unit for the histo (MeV or keV, cm or mm, etc..)
0102
0103 One can control the name of the histograms file with the command:
0104 /analysis/setFileName name (default Hadr06)
0105
0106 It is possible to choose the format of the histogram file : root (default),
0107 xml, csv, by using namespace in HistoManager.hh
0108
0109 It is also possible to print selected histograms on an ascii file:
0110 /analysis/h1/setAscii id
0111 All selected histos will be written on a file name.ascii (default Hadr04)
0112
0113 6- VISUALIZATION
0114
0115 The Visualization Manager is set in the main().
0116 The initialisation of the drawing is done via the commands
0117 /vis/... in the macro vis.mac. To get visualisation:
0118 > /control/execute vis.mac
0119
0120 The tracks are drawn at the end of event, and erased at the end of run.
0121 gamma green
0122 neutron yellow
0123 negative particles (e-, ...) red
0124 positive particles (e+, ions, ...) blue
0125
0126 7- HOW TO START ?
0127
0128 Execute Hadr06 in 'batch' mode from macro files :
0129 % Hadr06 run1.mac
0130
0131 Execute Hadr06 in 'interactive mode' with visualization :
0132 % Hadr06
0133 Idle> control/execute vis.mac
0134 ....
0135 Idle> type your commands
0136 ....
0137 Idle> exit
0138
0139 Macros provided in this example:
0140 - hadr06.in: macro used in Geant4 testing to produce hadr06.out
0141 - graphite.mac: neutron,14 MeV, in graphite
0142 - run1.mac: neutron,14 MeV, in Li7
0143 - singleFission.mac: single fission in U235
0144
0145 Macros to be run interactively:
0146 - debug.mac: water with thermal scattering
0147 - fission.mac: U235
0148 - vis.mac: To activate visualization
0149
