Gabriele Cosmo
75 lines
2.4 KiB
Plaintext
75 lines
2.4 KiB
Plaintext
$Id: README 90093 2015-05-13 11:59:54Z gcosmo $
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Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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=========================================================
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Example Par01
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-------------
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Example Par01 provides examples of the use of parameterisation facilities.
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It was moved in extended examples from novice/N05 with removal of
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novice examples.
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Geometry, sensitive detector, hits, processes are defined respectively in:
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Par01DetectorConstruction
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Par01CalorimeterSD
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Par01CalorimeterHit
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Par01PhysicsList
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The particularities are:
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o The parameterisation models:
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o Par01EMShowerModel which provides a crude
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parameterisation for e+/e-/gamma. This model
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is bound to the EM calorimeter.
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o Par01PionShowerModel: an even more crude
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parameterisation for pi+/pi-. This model
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is bound to a ghost volume.
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Those two models produces "hits": ie the energy
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of the incident particle is distributed into
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the volume of the envelope throught energy spots
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(class Par01EnergySpot), those energy spots being
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recorded in the sensitive detector at this point
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if any.
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They are rather similar from a technical point of vue.
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They both make use of a private G4Navigator to set
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their energy spots into the sensitive volumes.
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However, we don't take care of putting every spot into
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a sensitive (which is recommended in a "serious"
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parameterisation !).
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Those two models trigger their parameterisation
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on the first step the particle does in the envelope,
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but it would be perfectly possible to wait that the
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particle is far enough from the boundary of the envelope
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for example.
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o Par01PiModel: just there to show how a parameterisation
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can create secondaries, but not used.
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o Par01PhysicsList::AddParameterisation(). A method which
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sets the G4FastSimulationManagerProcess in the process
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manager of all the particles. This process provides
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the INTERFACE between the tracking and the parameterisation
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models.
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o Par01DetectorConstruction::Construct: in this method, the parameterisation
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models are built and bound to envelopes:
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o Par01EMShowerModel is bound to the electromagnetic
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calorimeter
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o Par01PionShowerModel is bound to a ghost volume
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which encompasses the electromagnetic and
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hadronic calorimters
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