| 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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