| 1 | $Id: README,v 1.1 1999/01/07 16:06:10 gunter Exp $
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| 2 | -------------------------------------------------------------------
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| 3 |
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| 4 | =========================================================
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| 5 | Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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| 6 | =========================================================
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| 7 |
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| 8 | ExampleN05
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| 9 | ----------
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| 10 |
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| 11 | ExampleN05 provides examples of the use of parameterisation facilities.
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| 12 |
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| 13 | Geometry, sensitive detector, hits, processes are defined respectively in:
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| 14 |
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| 15 | ExN05DetectorConstruction
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| 16 | ExN05CalorimeterSD
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| 17 | ExN05CalorimeterHit
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| 18 | ExN05PhysicsList
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| 19 |
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| 20 | The particularities are:
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| 21 |
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| 22 | o The parameterisation models:
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| 23 |
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| 24 | o ExN05EMShowerModel which provides a crude
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| 25 | parameterisation for e+/e-/gamma. This model
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| 26 | is bound to the EM calorimeter.
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| 27 |
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| 28 | o ExN05PionShowerModel: an even more crude
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| 29 | parameterisation for pi+/pi-. This model
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| 30 | is bound to a ghost volume.
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| 31 |
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| 32 | Those two models produces "hits": ie the energy
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| 33 | of the incident particle is distributed into
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| 34 | the volume of the envelope throught energy spots
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| 35 | (class ExN05EnergySpot), those energy spots being
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| 36 | recorded in the sensitive detector at this point
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| 37 | if any.
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| 38 |
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| 39 | They are rather similar from a technical point of vue.
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| 40 | They both make use of a private G4Navigator to set
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| 41 | their energy spots into the sensitive volumes.
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| 42 | However, we don't take car of putting every spot into
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| 43 | a sensitive (which is recommended in a "serious"
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| 44 | parameterisation !).
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| 45 |
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| 46 | Those two models trigger their parameterisation
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| 47 | on the first step the particle does in the envelope,
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| 48 | but it would be perfectly possible to wait that the
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| 49 | particle is far enough from the boundary of the envelope
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| 50 | for example.
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| 51 |
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| 52 | o ExN0PiModel: just there to show how a parameterisation
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| 53 | can create secondaries, but not used.
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| 54 |
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| 55 | o ExN05PhysicsList: AddParameterisation(). A method which
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| 56 | sets the G4FastSimulationManagerProcess in the process
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| 57 | manager of all the particles. This process provides
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| 58 | the INTERFACE between the tracking and the parameterisation
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| 59 | models.
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| 60 |
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| 61 | o ExN05DetectorConstruction: in the .cc file, the parameterisation
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| 62 | models are built and bound to envelopes:
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| 63 |
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| 64 | o ExN05EMShowerModel is bound to the electromagnetic
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| 65 | calorimeter
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| 66 |
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| 67 | o ExN05PionShowerModel is bound to a ghost volume
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| 68 | which encompasses the electromagnetic and
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| 69 | hadronic calorimters
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| 70 |
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| 71 |
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| 72 |
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