Gabriele Cosmo
69 lines
3.0 KiB
Plaintext
69 lines
3.0 KiB
Plaintext
$README, v 1.0 26.11.2004 Joanna Weng $
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-------------------------------------------------------------------
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=========================================================
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Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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=========================================================
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GFLASH Example
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----------
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This examples demonstrates the use of the GFLASH parameterisation library.
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It uses the GFLASH equations(hep-ex/0001020, Grindhammer & Peters)
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to parametrise electromagnetic showers in matter.
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In this example the calorimeter is a simple cube,
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which consists of 10 x 10 crystals of PbWO4 (CMS like:).
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The Geant4 shower framework is used (see novice example N05)
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Geometry, sensitive detector, hits, processes are defined respectively in:
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ExGflashDetectorConstruction
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ExGflashSensitiveDetector
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ExGflashHit
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ExGflashPhysicsList
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Briefly, whenever a e-/e+ enters the calorimeter, it is parametrised if it
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has a minimum energy and the shower is expected to be contained
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in the calorimeter(so called " parameterisation envelope").
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If this is fullfilled the particle is killed, as well as all secondaries,
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and the energy is deposited according to the GFLASH equations.
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The example shows how to interface GFLASH to your application.
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The simulation time is measured, so the user can see immiadiatly
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the speed up by using GFLASH.
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To use GFLASH the user has to implement the following to use GFLASH:
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o ExGflashPhysicsList::AddParameterisation():
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the paraameterisation has to be added to the processmanager.
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Don't forget it, since than gflash is never triggered.
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o ExGflashDetectorConstruction :
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Here GFLASH has to be initialized and assigend to the enelope,
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where it should be active (here our calorimeter = m_calo_log )
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/**********************************************
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* Initializing shower modell
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***********************************************/
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cout<<"Shower parameterization"<<endl;
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m_theFastShowerModel = new GFlashShowerModel("fastShowerModel",m_calo_log);
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m_theParametrisation = new GFlashHomoShowerParamterisation(matManager->getMaterial(mat));
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m_theFastShowerModel->SetParametrisation(*m_theParametrisation);
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m_theFastShowerModel->SetParticleBounds(*m_theParticleBounds) ;
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m_theFastShowerModel->SetHitMaker(*m_theHMaker);
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cout<<"end shower parameterization"<<endl;
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/**********************************************/
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o ExGflashSensitiveDetector:
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It is mandatory to use G4VGFlashSensitiveDetector as (additionl)
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base class for the sensitive detector.
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Here it is necessary to implement a seperate
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interface, where the GFlash spots are processed.
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(ProcessHits(G4GFlashSpot*aSpot ,G4TouchableHistory* ROhist))
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The separate interface is used, because the GFLASH spots contains
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(naturally) less information than the full simulation.
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Note: Intead of particle gun the gps class is used here for
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particle generation.
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