Example Par01 provides examples of the use of parameterisation facilities. It was moved in extended examples from novice/N05 with removal of novice examples.
Geometry, sensitive detector, hits, processes are defined respectively in:
The particularities are:
- The parameterisation models:
- Par01EMShowerModel which provides a crude parameterisation for e+/e-/gamma. This model is bound to the EM calorimeter.
- Par01PionShowerModel: an even more crude parameterisation for pi+/pi-. This model is bound to a ghost volume.
Those two models produces "hits": ie the energy of the incident particle is distributed into the volume of the envelope throught energy spots (class Par01EnergySpot), those energy spots being recorded in the sensitive detector at this point if any.
They are rather similar from a technical point of vue. They both make use of a private G4Navigator to set their energy spots into the sensitive volumes. However, we don't take care of putting every spot into a sensitive (which is recommended in a "serious" parameterisation !).
Those two models trigger their parameterisation on the first step the particle does in the envelope, but it would be perfectly possible to wait that the particle is far enough from the boundary of the envelope for example.
- Par01PiModel: just there to show how a parameterisation can create secondaries, but not used.
- Par01PhysicsList::AddParameterisation(). A method which sets the G4FastSimulationManagerProcess in the process manager of all the particles. This process provides the INTERFACE between the tracking and the parameterisation models.
- In Par01DetectorConstruction::Construct(): the parameterisation models are built and bound to envelopes:
- The Physics list used is FTFP_BERT which is augmented using the G4FastSimulationPhysics physics constructor to insert the G4FastSimulationManagerProcess that is making the interface between the fast simulation and the tracking. The configuration is shown in examlePar01.cc.
1.9.8