| [1342] | 1 | $Id: README,v 1.5 2010/09/08 11:22:01 vnivanch Exp $
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| [807] | 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 | TestEm8
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| 9 | -------
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| 10 |
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| [1342] | 11 | Example for investigation of ionisation in thin absorbers and gaseous
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| 12 | detectors
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| [807] | 13 |
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| 14 | 1- GEOMETRY DEFINITION
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| 15 |
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| [1342] | 16 | The target is a cilinder made of a given material placed inside
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| 17 | cilindrical container, which is placed inside the world volume.
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| [807] | 18 |
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| [1342] | 19 | Following parameters define the geometry:
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| 20 | - the material of the target,
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| 21 | - the thickness of the target,
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| 22 | - the radius of the target,
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| 23 | - the material of the container,
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| 24 | - the thickness of the container,
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| 25 | - the material of the world.
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| 26 |
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| 27 | The list of materials used in gaseous detectors are built inside
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| 28 | the DetectorConstruction class, also NIST materials are availabe.
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| 29 | The default geometry is provided but all parameters can be changed via
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| 30 | UI commands defined in the DetectorMessenger class, for example,
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| [807] | 31 |
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| [1342] | 32 | /testem/setGasMat XeCH4C3H8
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| 33 | /testem/setWindowMat G4_MYLAR
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| 34 | /testem/setWorldMat G4_AIR
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| 35 | /testem/setGasThick 10 cm
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| 36 | /testem/setGasRad 20 cm
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| 37 | /testem/setWindowThick 50 um
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| 38 |
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| [807] | 39 |
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| 40 | 2- AN EVENT : THE PRIMARY GENERATOR
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| 41 |
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| 42 | The primary kinematic consists of a single particle which hits the
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| 43 | absorber perpendicular to the input face. The type of the particle
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| [1342] | 44 | and its energy can be set via the G4 build-in commands of ParticleGun
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| [807] | 45 | A RUN is a set of events.
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| 46 |
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| 47 | 3- DETECTOR RESPONSE
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| 48 |
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| [1342] | 49 | The TargetSD class sending information about each step inside the target
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| 50 | to the HistoManager class scoring of energy deposition in the detector.
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| 51 | Additionally at each step of a particle inside the target the number of
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| 52 | ionisation clusters is sampled using G4ElectronIonPair helper class. The
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| 53 | parameter of transformation of energy into ionisation clusters can be
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| 54 | set via UI command:
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| [807] | 55 |
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| [1342] | 56 | /testem/setPairEnergy 19 eV
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| [807] | 57 |
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| 58 |
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| [1342] | 59 | 4- PHYSICS
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| [807] | 60 |
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| 61 | The particle's type and the physic processes which will be available
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| [1342] | 62 | in this example are set in PhysicsList class, which uses Geant4
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| 63 | EM physics constructors providing in the physics_list library.
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| [807] | 64 |
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| [1342] | 65 | The messenger classes introduce interactive commands. In particular,
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| 66 | PAI ionisation model can be added using G4EmConfurator helper class,
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| 67 | which is invokated by the UI command
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| 68 |
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| 69 | /testem/phys/addPhysics pai
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| 70 |
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| [807] | 71 | 5- HOW TO START ?
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| 72 |
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| 73 | - compile and link to generate an executable
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| 74 | % cd TestEm8
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| 75 | % gmake
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| 76 |
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| 77 | - execute TestEm8 in 'batch' mode from macro files e.g.
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| [1342] | 78 | % $(G4INSTALL)/bin/$(G4SYSTEM)/TestEm8 TestEm8.in
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| [807] | 79 |
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| 80 | - execute TestEm8 in 'interactive' mode with visualization e.g.
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| 81 | % $(G4INSTALL)/bin/$(G4SYSTEM)/TestEm8
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| 82 | ....
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| 83 | Idle> type your commands
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| 84 | ....
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| 85 |
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| 86 |
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| 87 |
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| 88 |
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