Gabriele Cosmo
133 lines
5.2 KiB
Plaintext
133 lines
5.2 KiB
Plaintext
$Id: README 69174 2013-04-21 20:38:15Z maire $
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=========================================================
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Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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=========================================================
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Hadr06
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------
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Survey energy deposition and particle's flux from an hadronic cascade.
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Use PhysicsConstructor objects rather than predefined G4 PhysicsLists.
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1- MATERIALS AND GEOMETRY DEFINITION
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The geometry is a single sphere (absorber) of an homogenous material.
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Two parameters define the geometry :
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- the radius of the sphere
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- the material of the sphere
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The default geometry (R=30 cm of water) is built in
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DetectorConstruction, but the above parameters can be changed interactively
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via commands defined in DetectorMessenger.
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The absorber is surrounded by a World volume (vacuum)
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A function, and its associated UI command, allows to build a material
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directly from a single isotope.
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To be identified by the ThermalScattering module, the elements composing a
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material must have a specific name (see G4ParticleHPThermalScatteringNames.cc)
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Examples of such materials are build in DetectorConstruction.
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2- PHYSICS LIST
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"Full" set of physics processes are registered, but via PhysicsConstructor
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objects rather than complete pre-defined G4 physics lists. This alternative
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way gives more freedom to register physics.
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PhysicsConstructors are either predefined G4 PhysicsConstructors or 'local'.
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They include : HadronElastic (including neutronHP), HadronInelastic,
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IonsInelastic, GammaNuclear physics, RadioactiveDecay and Electomagnetic physics.
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(see geant4/source/physics_lists/constructors)
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ElectromagneticPhysics is a variante of EmStandard. No step constraint is imposed for
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energy loss mechanism (ionisation and brems). This is enough when spatial distribution
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of deposited energy do not need to be accurate.
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(see param->SetStepFunction(1., 1*mm))
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Several hadronic physics options are controlled by environment variables.
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To trigger them, an envHadronic.csh has been added in this example.
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One must select the options wished, and do
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source envHadronic.csh (or sh)
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3- AN EVENT : THE PRIMARY GENERATOR
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The primary kinematic is a single particle randomly shooted at the
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centre of the sphere. The type of the particle and its energy are set in
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PrimaryGeneratorAction (neutron 14 MeV), and can be changed via the G4
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build-in commands of ParticleGun class (see the macros provided with
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this example).
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4- PHYSICS
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The program computes and plots energy deposited in the interaction volume
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(absorber) and the flux of particles leaving this volume.
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Processes invoked and particles generated during hadronic cascade are listed.
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5- HISTOGRAMS
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The test contains 13 built-in 1D histograms, which are managed by
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G4AnalysisManager and its Messenger. The histos can be individually
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activated with the command :
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/analysis/h1/set id nbBins valMin valMax unit
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where unit is the desired unit for the histo (MeV or keV, etc..)
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(see the macros xxxx.mac).
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1 "total energy deposit"
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2 "Edep (MeV/mm) profile along radius"
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3 "total kinetic energy flow"
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4 "gamma flux (dN/dE) at exit"
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5 "e+- flux (dN/dE) at exit"
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6 "neutrons flux (dN/dE) at exit"
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7 "protons flux (dN/dE) at exit"
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8 "deuterons flux (dN/dE) at exit"
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9 "alphas flux (dN/dE) at exit"
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10 "all others ions flux (dN/dE) at exit"
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11 "all others baryons flux (dN/dE) at exit"
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12 "all others mesons flux (dN/dE) at exit"
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13 "all others leptons flux (dN/dE) at exit"
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The histograms are managed by the HistoManager class and its Messenger.
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The histos can be individually activated with the command :
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/analysis/h1/set id nbBins valMin valMax unit
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where unit is the desired unit for the histo (MeV or keV, deg or mrad, etc..)
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One can control the name of the histograms file with the command:
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/analysis/setFileName name (default Hadr06)
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It is possible to choose the format of the histogram file : root (default),
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xml, csv, by using namespace in HistoManager.hh
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It is also possible to print selected histograms on an ascii file:
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/analysis/h1/setAscii id
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All selected histos will be written on a file name.ascii (default Hadr04)
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6- VISUALIZATION
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The Visualization Manager is set in the main().
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The initialisation of the drawing is done via the commands
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/vis/... in the macro vis.mac. To get visualisation:
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> /control/execute vis.mac
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The tracks are drawn at the end of event, and erased at the end of run.
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gamma green
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neutron yellow
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negative particles (e-, ...) red
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positive particles (e+, ions, ...) blue
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7- HOW TO START ?
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Execute Hadr06 in 'batch' mode from macro files :
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% Hadr06 run1.mac
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Execute Hadr06 in 'interactive mode' with visualization :
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% Hadr06
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Idle> control/execute vis.mac
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....
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Idle> type your commands
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....
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Idle> exit
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