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Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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Chem3
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This example is provided by the Geant4-DNA collaboration.
These processes and models are further described at:
http://geant4-dna.org
Any report or published results obtained using the Geant4-DNA software shall
cite the following Geant4-DNA collaboration publications:
Phys. Med. 31 (2015) 861-874
Med. Phys. 37 (2010) 4692-4708
How to implement user actions in the chemistry module.
1 - GEOMETRY DEFINITION
It is a simple box which represents a 'semi infinite' homogeneous medium.
Two parameters define the geometry :
- the material of the box -- for Geant4-DNA it has to be water.
- the full size of the box.
The default geometry is constructed in DetectorConstruction class, but all of
the above parameters can be changed interactively via the commands defined in
the DetectorMessenger class.
2 - PHYSICS LIST
The physics list is initialized in G4EmDNAChemistry, together with chemical
stage models configuration.
3 - AN EVENT: THE PRIMARY GENERATOR
The primary kinematic consists of a single particle starting at the center of
the sphere. The type of the particle and its energy are set in the
PrimaryGeneratorAction class, and can be changed via the G4 build-in commands
of G4ParticleGun class.
The chemistry module is triggered in the StackingAction class when all
physical tracks have been processed.
4 - HOW TO START ?
Run the example from this directory.
The user interface will be launched. Continue using /run/beamOn 1 command.
5 - OUTPUT
Physics initialization and the defined reaction table are printed.
G4ITStepManager processes the chemical stage time step after time step.
Chemical reactions are printed.
In the GUI window a cummulative trajectory of the chemical species is drawn.
6 - TIME EVOLUTION VISUALIZATION
User can start a visualization of the chemical track evolution in time and space
using /control/execute movie.mac.
Note, that in default setup the simulation requires machine with 6 GB of RAM.
To lower memory requirements, either decrease energy of the incident electron
in prep.mac or/and shorten the simulation using SetEndTime setting in
src/ActionInitialization.cc.
