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Survey energy deposition and particle's flux from an hadronic cascade. Use PhysicsConstructor objects rather than predefined G4 PhysicsLists.
The geometry is a single sphere (absorber) of an homogenous material.
Two parameters define the geometry :
The default geometry (R=30 cm of water) is built in DetectorConstruction, but the above parameters can be changed interactively via commands defined in DetectorMessenger.
The absorber is surrounded by a World volume (vacuum)
A function, and its associated UI command, allows to build a material directly from a single isotope.
To be identified by the ThermalScattering module, the elements composing a material must have a specific name (see G4NeutronHPThermalScatteringNames.cc) Examples of such materials are build in DetectorConstruction.
"Full" set of physics processes are registered, but via PhysicsConstructor objects rather than complete pre-defined G4 physics lists. This alternative way gives more freedom to register physics.
Physics constructors are either constructors provided in Geant4 (with G4 prefix) or 'local'. They include : HadronElastic, HadronInelastic, IonsInelastic, GammaNuclear, RadioactiveDecay and Electomagnetic. (see geant4/source/physics_lists/constructors)
HadronElasticPhysicsHP include a model for thermalized neutrons, under the control of a command defined in NeutronHPMesseger.
GammmaNuclearPhysics is a subset of G4BertiniElectroNuclearBuilder.
ElectromagneticPhysics is a simplified version of G4EmStandardPhysics.
Several hadronic physics options are controlled by environment variables. To trigger them, see Hadr06.cc
The primary kinematic is a single particle randomly shooted at the centre of the sphere. The type of the particle and its energy are set in PrimaryGeneratorAction (neutron 14 MeV), and can be changed via the G4 build-in commands of ParticleGun class (see the macros provided with this example).
The program computes and plots energy deposited in the interaction volume (absorber) and the flux of particles leaving this volume. Processes invoked and particles generated during hadronic cascade are listed.
The test contains 24 built-in 1D histograms :
1 "total energy deposit"
2 "Edep (MeV/mm) profile along radius"
3 "total kinetic energy flow"
4 "energy spectrum of gamma at creation"
5 "energy spectrum of e+- at creation"
6 "energy spectrum of neutrons at creation"
7 "energy spectrum of protons at creation"
8 "energy spectrum of deuterons at creation"
9 "energy spectrum of alphas at creation"
10 "energy spectrum of all others ions at creation"
11 "energy spectrum of all others baryons at creation"
12 "energy spectrum of all others mesons at creation"
13 "energy spectrum of all others leptons (neutrinos) at creation"
14 "energy spectrum of emerging gamma"
15 "energy spectrum of emerging e+-"
16 "energy spectrum of emerging neutrons"
17 "energy spectrum of emerging protons"
18 "energy spectrum of emerging deuterons"
19 "energy spectrum of emerging alphas"
20 "energy spectrum of all others emerging ions"
21 "energy spectrum of all others emerging baryons"
22 "energy spectrum of all others emerging mesons"
23 "energy spectrum of all others emerging leptons (neutrinos)"
24 "total energy released : edep + eflow"
The histograms are managed by the HistoManager class and its Messenger. The histos can be individually activated with the command :
/analysis/h1/set id nbBins valMin valMax unit
where unit is the desired unit for the histo (MeV or keV, cm or mm, etc..)
One can control the name of the histograms file with the command:
/analysis/setFileName name (default Hadr06)
It is possible to choose the format of the histogram file : root (default), xml, csv, by using namespace in HistoManager.hh
It is also possible to print selected histograms on an ascii file:
/analysis/h1/setAscii id
All selected histos will be written on a file name.ascii (default Hadr06)
The Visualization Manager is set in the main(). The initialisation of the drawing is done via the commands /vis/... in the macro vis.mac. To get visualisation:
> /control/execute vis.mac
The tracks are drawn at the end of event, and erased at the end of run. gamma green
neutron yellow negative particles (e-, ...) red positive particles (e+, ions, ...) blue
Execute Hadr06 in 'batch' mode from macro files :
% Hadr06 run1.mac
Execute Hadr06 in 'interactive mode' with visualization :
% Hadr06 Idle> control/execute vis.mac .... Idle> type your commands .... Idle> exit
Macros provided in this example:
Macros to be run interactively:
1.9.8