| 1 | $README, v 1.0 26.11.2004 Joanna Weng $ |
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| 2 | ------------------------------------------------------------------- |
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| 3 | |
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| 4 | |
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| 5 | |
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| 6 | |
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| 7 | ========================================================= |
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| 8 | Geant4 - an Object-Oriented Toolkit for Simulation in HEP |
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| 9 | ========================================================= |
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| 10 | |
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| 11 | GFLASH Example |
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| 12 | ---------- |
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| 13 | |
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| 14 | This examples demonstrates the use of the GFLASH parameterisation library. |
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| 15 | It uses the GFLASH equations(hep-ex/0001020, Grindhammer & Peters) |
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| 16 | to parametrise electromagnetic showers in matter. |
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| 17 | In this example the calorimeter is a simple cube, |
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| 18 | which consists of 10 x 10 crystals of PbWO4 (CMS like:). |
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| 19 | The Geant4 shower framework is used (see novice example N05) |
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| 20 | Geometry, sensitive detector, hits, processes are defined respectively in: |
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| 21 | |
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| 22 | ExGflashDetectorConstruction |
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| 23 | ExGflashSensitiveDetector |
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| 24 | ExGflashHit |
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| 25 | ExGflashPhysicsList |
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| 26 | |
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| 27 | Briefly, whenever a e-/e+ enters the calorimeter, it is parametrised if it |
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| 28 | has a minimum energy and the shower is expected to be contained |
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| 29 | in the calorimeter(so called " parameterisation envelope"). |
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| 30 | If this is fullfilled the particle is killed, as well as all secondaries, |
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| 31 | and the energy is deposited according to the GFLASH equations. |
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| 32 | The example shows how to interface GFLASH to your application. |
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| 33 | The simulation time is measured, so the user can see immiadiatly |
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| 34 | the speed up by using GFLASH. |
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| 35 | |
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| 36 | |
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| 37 | To use GFLASH the user has to implement the following to use GFLASH: |
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| 38 | |
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| 39 | o ExGflashPhysicsList::AddParameterisation(): |
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| 40 | the paraameterisation has to be added to the processmanager. |
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| 41 | Don't forget it, since than gflash is never triggered. |
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| 42 | |
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| 43 | o ExGflashDetectorConstruction : |
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| 44 | Here GFLASH has to be initialized and assigend to the enelope, |
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| 45 | where it should be active (here our calorimeter = m_calo_log ) |
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| 46 | /********************************************** |
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| 47 | * Initializing shower modell |
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| 48 | ***********************************************/ |
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| 49 | cout<<"Shower parameterization"<<endl; |
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| 50 | m_theFastShowerModel = new GFlashShowerModel("fastShowerModel",m_calo_log); |
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| 51 | m_theParametrisation = new GFlashHomoShowerParamterisation(matManager->getMaterial(mat)); |
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| 52 | m_theFastShowerModel->SetParametrisation(*m_theParametrisation); |
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| 53 | m_theFastShowerModel->SetParticleBounds(*m_theParticleBounds) ; |
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| 54 | m_theFastShowerModel->SetHitMaker(*m_theHMaker); |
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| 55 | cout<<"end shower parameterization"<<endl; |
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| 56 | /**********************************************/ |
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| 57 | |
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| 58 | o ExGflashSensitiveDetector: |
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| 59 | It is mandatory to use G4VGFlashSensitiveDetector as (additionl) |
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| 60 | base class for the sensitive detector. |
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| 61 | Here it is necessary to implement a seperate |
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| 62 | interface, where the GFlash spots are processed. |
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| 63 | (ProcessHits(G4GFlashSpot*aSpot ,G4TouchableHistory* ROhist)) |
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| 64 | The separate interface is used, because the GFLASH spots contains |
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| 65 | (naturally) less information than the full simulation. |
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| 66 | |
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| 67 | Note: Intead of particle gun the gps class is used here for |
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| 68 | particle generation. |
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| 69 | |
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