| 1 | $Id: README,v 1.23 2006/05/15 14:38:40 maire 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 | TestEm2
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| 9 | -------
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| 10 |
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| 11 | How to do shower profiles in an homogenous medium, with virtual
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| 12 | voxelisation.
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| 13 |
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| 14 | 1- GEOMETRY DEFINITION
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| 15 |
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| 16 | The geometry consists of a cylinder of homegenous material.
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| 17 |
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| 18 | The default geometry is constructed in DetectorConstruction class,
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| 19 | but all of the above parameters can be modified interactively via
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| 20 | the commands defined in the DetectorMessenger class.
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| 21 |
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| 22 | Material can be choosen: Air Water lAr Al Fe BGO PbWO4 Pb.
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| 23 | eg: /testem/det/setMat PbWO4
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| 24 |
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| 25 | The cylinder is virtually sliced longitudinaly (slice) and radialy (ring).
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| 26 | The size of the slices and rings are expressed in radiation length units
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| 27 | and can be changed.
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| 28 | eg: /testem/det/setLbin 20 1. ---> 20 slices of 1. radl
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| 29 | /testem/det/setRbin 5 0.25 ---> 5 rings of 0.25 radl
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| 30 | /testem/det/update ---> rebuild the geometry
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| 31 |
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| 32 | (MaxBin = 500 in both directions)
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| 33 |
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| 34 | An uniform magnetic field along the cylinder axis can be set.
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| 35 | eg: /testem/det/setField 5 tesla
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| 36 |
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| 37 | 2- PHYSICS LISTS
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| 38 |
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| 39 | Modular PhysicsList are used. The following modules can be activated:
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| 40 | 1. "standard" - (alternative) standard EM physics
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| 41 | 2. "g4v52" - (alternative) standard EM physics version G4 5.2
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| 42 | 3. "high_energy" - add high energy processes
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| 43 |
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| 44 | To activate a specific module the UI command can be used:
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| 45 | "/testem/phys/addPhysics title"
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| 46 | By default "standard" module is loaded.
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| 47 |
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| 48 | 3- AN EVENT : THE PRIMARY GENERATOR
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| 49 |
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| 50 | The primary kinematic consists of a single particle which hits the
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| 51 | cylinder perpendicular to the input face. The type of the particle
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| 52 | and its energy are set in the PrimaryGeneratorAction class, and can
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| 53 | changed via the G4 build-in commands of ParticleGun class (see
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| 54 | the macros provided with this example).
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| 55 |
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| 56 | A RUN is a set of events.
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| 57 |
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| 58 | 4- VISUALIZATION
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| 59 |
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| 60 | The Visualization Manager is set in the main().
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| 61 | The initialisation of the drawing is done via the commands
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| 62 | /vis/.. in the macro vis.mac. In interactive session:
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| 63 | PreInit or Idle > /control/execute vis.mac
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| 64 |
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| 65 | The detector has a default view which is a longitudinal view of the
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| 66 | cylinder.
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| 67 |
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| 68 | The tracks are drawn at the end of event, and erased at the end of run.
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| 69 | Optionaly one can choose to draw all particles, only the charged one,
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| 70 | or none. This command is defined in EventActionMessenger class.
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| 71 |
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| 72 | 5- PHYSICS DEMO
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| 73 |
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| 74 | The particle's type and the physic processes which will be available
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| 75 | in this example are set in PhysicsList class.
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| 76 |
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| 77 | In addition a build-in interactive command (/process/inactivate proname)
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| 78 | allows to activate/inactivate the processes one by one.
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| 79 |
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| 80 | The threshold for producing secondaries can be changed.
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| 81 | eg: /testem/phys/setCuts 100 microm
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| 82 | /run/initialize
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| 83 |
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| 84 | The shower profiles are histogramed, if histograming is activated.
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| 85 | They can be also printed with the command /testem/run/verbose 1
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| 86 |
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| 87 | 6- HOW TO START ?
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| 88 |
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| 89 | - compile and link to generate an executable
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| 90 | % cd TestEm2
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| 91 | % gmake
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| 92 |
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| 93 | - execute TestEm2 in 'batch' mode from macro files
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| 94 | % TestEm2 run01.mac
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| 95 |
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| 96 | - execute TestEm2 in 'interactive mode' with visualization
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| 97 | % TestEm2
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| 98 | ....
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| 99 | Idle> type your commands
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| 100 | ....
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| 101 | Idle> exit
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| 102 |
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| 103 | 7- HISTOGRAMS
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| 104 |
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| 105 | TestEm2 produces several histograms:
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| 106 |
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| 107 | Content of these histo:
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| 108 |
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| 109 | 1 : energy deposit per event
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| 110 | 2 : charged track length per event
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| 111 | 3 : neutral track length per event
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| 112 |
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| 113 | 4 : longitudinal energy profile
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| 114 | 5 : cumulated longitudinal energy profile
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| 115 | 6 : rms of cumulated longitudinal energy profile
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| 116 |
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| 117 | 7 : radial energy profile
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| 118 | 8 : cumulated radial energy profile
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| 119 | 9 : rms of cumulated radial energy profile
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| 120 |
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| 121 | Note that, by default, histograms are disabled. To activate them, uncomment
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| 122 | the flag G4ANALYSIS_USE in GNUmakefile. To define the output file name with
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| 123 | histograms and the type of these file the following UI commands can be used:
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| 124 |
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| 125 | "/testem/histo/setFileName name"
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| 126 | "/testem/histo/setFileType type"
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| 127 |
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| 128 | The following types are available: "hbook", "root", "XML"
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| 129 | By default the name is "testem2" and the type "hbook".
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| 130 |
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| 131 | Before compilation of the example it is optimal to clean up old files:
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| 132 | gmake histclean
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| 133 | gmake
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| 134 |
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| 135 | 8- USING HISTOGRAMS
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| 136 |
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| 137 | To use histograms, at least one of the AIDA implementations should be
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| 138 | available (see http://aida.freehep.org).
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| 139 |
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| 140 | 8a - PI
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| 141 |
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| 142 | A package including AIDA and extended interfaces also using Python is PI,
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| 143 | available from: http://cern.ch/pi
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| 144 |
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| 145 | Once installed PI or PI-Lite in a specified local area $MYPY, it is required
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| 146 | to add the installation path to $PATH, i.e. for example, for release 1.2.1 of
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| 147 | PI:
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| 148 | setenv PATH ${PATH}:$MYPI/1.2.1/app/releases/PI/PI_1_2_1/rh73_gcc32/bin
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| 149 |
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| 150 | CERN users can use the PATH to the LCG area on AFS.
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| 151 | Before running the example the command should be issued:
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| 152 | eval `aida-config --runtime csh`
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| 153 |
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| 154 | 8b - OpenScientist
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| 155 |
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| 156 | OpenScientist is available at http://OpenScientist.lal.in2p3.fr.
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| 157 |
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| 158 | You have to "setup" the OpenScientist AIDA implementation before compiling
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| 159 | (then with G4ANALYSIS_USE set) and running your Geant4 application.
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| 160 |
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| 161 | On UNIX you setup, with a csh flavoured shell :
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| 162 | csh> source <<OpenScientist install path>/aida-setup.csh
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| 163 | or with a sh flavoured shell :
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| 164 | sh> . <<OpenScientist install path>/aida-setup.sh
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| 165 | On Windows :
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| 166 | DOS> call <<OpenScientist install path>/aida-setup.bat
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| 167 |
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| 168 | You can use various file formats for writing (AIDA-XML, hbook, root).
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| 169 | These formats are readable by the Lab onx interactive program
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| 170 | or the OpenPAW application. See the web pages.
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| 171 |
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| 172 |
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| 173 | With OpenPAW, on a run.hbook file, one can view the histograms
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| 174 | with something like :
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| 175 | OS> opaw
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| 176 | opaw> h/file 1 run.hbook ( or opaw> h/file 1 run.aida or run.root)
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| 177 | opaw> zone 2 2
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| 178 | opaw> h/plot 1
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| 179 | opaw> h/plot 2
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