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Gabriele Cosmo
2021-12-12 17:16:06 +01:00
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examples/extended/electromagnetic/TestEm8/.README.txt
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///\file "electromagnetic/TestEm8/.README.txt"
///\brief Example TestEm8 README page
/*! \page ExampleTestEm8 Example TestEm8
Example for investigation of ionisation in thin absorbers and gaseous
detectors
\section TestEm8_s1 GEOMETRY DEFINITION
The target is a cylinder made of a given material placed inside
cylindrical container, which is placed inside the world volume.
Following parameters define the geometry:
- the material of the target,
- the thickness of the target,
- the radius of the target,
- the material of the container,
- the thickness of the container,
- the material of the world.
The list of materials used in gaseous detectors are built inside
the DetectorConstruction class, also NIST materials are available.
The default geometry is provided but all parameters can be changed via
UI commands defined in the DetectorMessenger class, for example,
\verbatim
/testem/setGasMat XeCH4C3H8
/testem/setWindowMat G4_MYLAR
/testem/setWorldMat G4_AIR
/testem/setGasThick 10 cm
/testem/setGasRad 20 cm
/testem/setWindowThick 50 um
\endverbatim
\section TestEm8_s2 AN EVENT : THE PRIMARY GENERATOR
The primary kinematic consists of a single particle which hits the
absorber perpendicular to the input face. The type of the particle
and its energy can be set via the G4 build-in commands of G4ParticleGun .
A RUN is a set of events.
\section TestEm8_s3 DETECTOR RESPONSE
The TargetSD class sending information about each step inside the target
to the HistoManager class scoring of energy deposition in the detector.
Additionally at each step of a particle inside the target the number of
ionisation clusters is sampled using G4ElectronIonPair helper class. The
parameter of transformation of energy into ionisation clusters can be
set via UI command:
\verbatim
/testem/setPairEnergy 19 eV
\endverbatim
\section TestEm8_s4 PHYSICS
The particle's type and the physics processes which will be available
in this example are set in PhysicsList class, which uses Geant4
EM physics constructors provided in the physics_list library.
The PhysicsListMessenger classes introduce interactive commands. In particular,
PAI ionisation model can be added using G4EmConfigurator helper class,
which is invoked by the UI command
\verbatim
/testem/phys/addPhysics pai
\endverbatim
\section TestEm8_s5- HOW TO START ?
- Execute TestEm8 in 'batch' mode from macro files e.g.
\verbatim
% $(G4INSTALL)/bin/$(G4SYSTEM)/TestEm8 TestEm8.in N
\endverbatim
here N means number of threads in multi-threaded mode, by
default 2 threads are used
- Execute TestEm8 in 'interactive' mode with visualization e.g.
\verbatim
% $(G4INSTALL)/bin/$(G4SYSTEM)/TestEm8
....
Idle> type your commands
....
\endverbatim
*/
examples/extended/electromagnetic/TestEm8/README
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-------------------------------------------------------------------
=========================================================
Geant4 - an Object-Oriented Toolkit for Simulation in HEP
=========================================================
TestEm8
-------
Example for investigation of ionisation in thin absorbers and gaseous
detectors
1- GEOMETRY DEFINITION
The target is a cylinder made of a given material placed inside
cylindrical container, which is placed inside the world volume.
Following parameters define the geometry:
- the material of the target,
- the thickness of the target,
- the radius of the target,
- the material of the container,
- the thickness of the container,
- the material of the world.
The list of materials used in gaseous detectors are built inside
the DetectorConstruction class, also NIST materials are available.
The default geometry is provided but all parameters can be changed via
UI commands defined in the DetectorMessenger class, for example,
/testem/setGasMat XeCH4C3H8
/testem/setWindowMat G4_MYLAR
/testem/setWorldMat G4_AIR
/testem/setGasThick 10 cm
/testem/setGasRad 20 cm
/testem/setWindowThick 50 um
2- AN EVENT : THE PRIMARY GENERATOR
The primary kinematic consists of a single particle which hits the
absorber perpendicular to the input face. The type of the particle
and its energy can be set via the G4 build-in commands of G4ParticleGun.
A RUN is a set of events.
3- DETECTOR RESPONSE
The TargetSD class sending information about each step inside the target
to the HistoManager class scoring of energy deposition in the detector.
Additionally at each step of a particle inside the target the number of
ionisation clusters is sampled using G4ElectronIonPair helper class. The
parameter of transformation of energy into ionisation clusters can be
set via UI command:
/testem/setPairEnergy 19 eV
4- PHYSICS
The particle's type and the physics processes which will be available
in this example are set in PhysicsList class, which uses Geant4
EM physics constructors provided in the physics_list library.
The messenger classes introduce interactive commands. In particular,
PAI ionisation model can be added using G4EmConfigurator helper class,
which is invoked by one following UI commands:
/testem/phys/addPhysics pai
/testem/phys/addPhysics pai_photon
/process/em/AddPAIRegion all GasDetector pai
/process/em/AddPAIRegion all GasDetector pai_photon
Cuts for all setup and/or for sensitive volume may changed via commands:
/run/setCut 0.5 mm
/run/setCutForRegion GasDetector 1.8 mm
5- HOW TO START ?
Execute TestEm8 in 'batch' mode from macro files e.g.
% $(G4INSTALL)/bin/$(G4SYSTEM)/TestEm8 TestEm8.in N
here N means number of threads in multi-threaded mode, by
default 2 threads are used
- execute TestEm8 in 'interactive' mode with visualization e.g.
% $(G4INSTALL)/bin/$(G4SYSTEM)/TestEm8
....
Idle> type your commands
....