| 1 | $Id: README,v 1.5 2006/05/18 08:16:42 grichine 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 | TestEm10
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| 9 | --------
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| 10 |
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| 11 | Test for investigation of ionisation in thin absorbers, transition
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| 12 | and synchrotron radiations. Default setup for "TestEm10.in" and "TestEm10.large_N.in" is
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| 13 | the experiment for XTR with NIM A294 (1990) 465-472 (fig. 11) setup
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| 14 |
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| 15 |
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| 16 | 0- INTRODUCTION
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| 17 |
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| 18 | The parameterisations models can be changed simply with:
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| 19 |
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| 20 | Idle> /XTRdetector/setModel i (i = 1 to 10)
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| 21 |
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| 22 | It is NOT needed (and not recommended) to issue the command
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| 23 | /XTRdetector/update if just the model is changed.
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| 24 |
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| 25 | See macro file "TestEm10.in" for an example.
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| 26 |
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| 27 |
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| 28 | 1- GEOMETRY DEFINITION
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| 29 |
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| 30 | The "absorber" is a tube made of a given material.
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| 31 |
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| 32 | Three parameters define the absorber :
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| 33 | - the material of the absorber,
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| 34 | - the thickness of an absorber,
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| 35 | - the transverse size of the absorber (the input face is a square).
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| 36 |
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| 37 | The volume "World" contains the "absorber".
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| 38 | In this test the parameters of the "World" can be changed , too.
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| 39 |
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| 40 | In addition a transverse uniform magnetic field can be applied.
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| 41 |
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| 42 | The default geometry is constructed in DetectorConstruction class,
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| 43 | but all the parameters can be changed via
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| 44 | the commands defined in the DetectorMessenger class.
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| 45 |
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| 46 | 2- AN EVENT : THE PRIMARY GENERATOR
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| 47 |
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| 48 | The primary kinematic consists of a single particle which hits the
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| 49 | absorber perpendicular to the input face. The type of the particle
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| 50 | and its energy are set in the PrimaryGeneratorAction class, and can
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| 51 | be changed via the G4 build-in commands of ParticleGun class (see
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| 52 | the macros provided with this example).
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| 53 |
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| 54 | A RUN is a set of events.
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| 55 |
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| 56 | 3- DETECTOR RESPONSE
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| 57 |
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| 58 | Here we test G4PAIionisation , G4IonisationByLogicalVolume and
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| 59 | transition radiation processes
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| 60 |
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| 61 | A HIT is a record, event per event , of all the
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| 62 | informations needed to simulate and analyse the detector response.
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| 63 |
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| 64 | In this example a CalorHit is defined as a set of 2 informations:
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| 65 | - the total energy deposit in the absorber,
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| 66 | - the total tracklength of all charged particles in the absorber,
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| 67 |
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| 68 | Therefore the absorber is declared
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| 69 | 'sensitive detector' (SD), which means they can contribute to the hit.
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| 70 |
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| 71 | At the end of a run, from the histogram(s), one can study
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| 72 | different physics quantities such as :
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| 73 | - angle distribution,
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| 74 | - energy deposit,
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| 75 | - transmission/backscattering,
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| 76 | - ...
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| 77 |
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| 78 | The test contains 10 built-in histograms, which can be activated by
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| 79 | interactive commands (see the macros runxx.mac for details).
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| 80 |
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| 81 | The histogram files can be viewed using PAW e.g with the commands
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| 82 |
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| 83 | paw> h/file 1 geant4.plot01 or g4.p11
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| 84 | paw> option stat
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| 85 | paw> h/pl 1
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| 86 |
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| 87 |
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| 88 |
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| 89 | 4- PHYSICS DEMO
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| 90 |
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| 91 | The particle's type and the physic processes which will be available
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| 92 | in this example are set in PhysicsList class.
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| 93 |
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| 94 | The messenger classes introduce interactive commands . Using these
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| 95 | commands the geometry of the detector, the data of the primary
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| 96 | particle, the limits of the histograms , etc. can be changed.
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| 97 |
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| 98 |
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| 99 | 5- HOW TO START ?
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| 100 |
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| 101 | - compile and link to generate an executable
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| 102 | % cd TestEm10
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| 103 | % gmake
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| 104 |
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| 105 | - execute TestEm10 in 'batch' mode from macro files e.g.
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| 106 | % $(G4INSTALL)/bin/$(G4SYSTEM)/TestEm10 run11.mac
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| 107 |
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| 108 | - execute TestEm10 in 'interactive' mode with visualization e.g.
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| 109 | % $(G4INSTALL)/bin/$(G4SYSTEM)/TestEm10
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| 110 | ....
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| 111 | Idle> type your commands
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| 112 | ....
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| 113 |
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| 114 | List of the built-in histograms
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| 115 | -------------------------------
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| 116 |
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| 117 | 1. number of (tracking) steps/event
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| 118 | 2. energy deposit distribution in the absorber (in MeV)
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| 119 | 3. angle distribution of the primary particle at the exit
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| 120 | of the absorber (deg)
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| 121 | 4. distribution of the lateral displacement at exit(mm)
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| 122 | 5. kinetic energy of the transmitted primaries (MeV)
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| 123 | 6. angle distribution of the backscattered primaries (deg)
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| 124 | 7. kinetic energy of the backscattered primary particles (MeV)
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| 125 | 8. kinetic energy of the charged secondary particles (MeV)
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| 126 | 9. z distribution of the secondary charged vertices (mm)
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| 127 | 10. kinetic energy of the photons escaping the absorber (MeV)
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| 128 |
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| 129 |
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| 130 | Using histograms
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| 131 | ----------------
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| 132 |
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| 133 | By default the histograms are not activated. To activate histograms
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| 134 | the environment variable G4ANALYSIS_USE should be defined. For instance
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| 135 | uncomment the flag G4ANALYSIS_USE in GNUmakefile.
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| 136 |
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| 137 | To use histograms any of implementations of AIDA interfaces should
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| 138 | be available (see http://aida.freehep.org).
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| 139 |
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| 140 | A package including AIDA and extended interfaces also using Python
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| 141 | is PI, available from: http://cern.ch/pi .
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| 142 |
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| 143 | Once installed PI or PI-Lite in a specified local area $MYPY, it is
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| 144 | required to add the installation path to $PATH, i.e. for example,
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| 145 | for release 1.2.1 of PI:
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| 146 |
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| 147 | setenv PATH ${PATH}:$MYPI/1.2.1/app/releases/PI/PI_1_2_1/rh73_gcc32/bin
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| 148 |
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| 149 | CERN users can use the PATH to the LCG area on AFS.
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| 150 |
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| 151 | Before compilation of the example it is optimal to clean up old
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| 152 | files:
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| 153 |
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| 154 | gmake histclean
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| 155 | gmake
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| 156 |
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| 157 | Before running the example the command should be issued:
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| 158 |
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| 159 | eval `aida-config --runtime csh`
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| 160 |
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| 161 | It is possible to choose the format of the output file with
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| 162 | histograms using UI command:
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| 163 |
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| 164 | /testem/histo/setFileType type
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| 165 |
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| 166 | The following types are available: hbook, root, xml.
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