[1337] | 1 | $Id: README,v 1.2 2009/07/15 10:19:47 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 | monopole |
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| 9 | -------- |
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| 10 | V.Ivanchenko, M.Vladymyrov |
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| 11 | CERN, Geneva, Switzerland |
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| 12 | Lebedev Physical Institute, Moscow, Russia |
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| 13 | |
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| 14 | |
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| 15 | This example is devoted to the energy deposited by classical magnetic |
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| 16 | monopole. |
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| 17 | |
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| 18 | |
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| 19 | |
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| 20 | 1- GEOMETRY DEFINITION |
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| 21 | |
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| 22 | The geometry consists of a single block of a homogenous material, |
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| 23 | placed in a world. |
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| 24 | |
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| 25 | Four parameters define the geometry : |
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| 26 | - the material of the box |
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| 27 | - the thickness of the box |
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| 28 | - the tranverse dimension of the box |
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| 29 | - the maximal step size in target |
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| 30 | |
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| 31 | The default is 10 cm of alumunium, step is limited by 5mm. |
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| 32 | Equivalent UI commands are following: |
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| 33 | /testex/det/setMat G4_Al |
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| 34 | /testex/det/sizeX 10 cm |
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| 35 | /testex/det/sizeYZ 5 cm |
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| 36 | /testex/det/setStepSize 5 mm |
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| 37 | |
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| 38 | The default geometry is constructed in DetectorConstruction class, |
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| 39 | but all of the above parameters can be changed interactively via |
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| 40 | the commands defined in the DetectorMessenger class. After changing |
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| 41 | material and/or dimentions one must update the detector construction: |
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| 42 | /testex/det/update |
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| 43 | |
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| 44 | 2- PHYSICS LIST |
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| 45 | |
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| 46 | Physics Lists include standard QGSP physics and additional builder |
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| 47 | for monopole physics. |
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[1337] | 48 | To define monopole parameters an extra string should be provided |
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| 49 | a) interactive mode by UI command: |
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| 50 | /monopole/setup 2 0 200 GeV (magnetic number, electric number, mass) |
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| 51 | b) batch mode: |
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| 52 | $G4BIN/$G4SYSTEM/monopole file.mac '2 0 200 GeV' |
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[807] | 53 | |
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| 54 | 3- AN EVENT : THE PRIMARY GENERATOR |
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| 55 | |
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| 56 | The primary kinematic consists of a single particle which hits the |
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| 57 | block perpendicular to the input face. The type of the particle |
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| 58 | and its energy are set in the PrimaryGeneratorAction class, and can |
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| 59 | changed via the G4 build-in commands of ParticleGun class (see |
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| 60 | the macros provided with this example). |
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| 61 | The default is monopole 100 GeV |
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| 62 | |
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| 63 | In addition one can define randomly the impact point of the incident |
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| 64 | particle. The corresponding interactive command is built in |
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| 65 | PrimaryGeneratorMessenger class. |
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| 66 | |
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| 67 | A RUN is a set of events. |
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| 68 | |
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| 69 | |
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| 70 | 4- VISUALIZATION |
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| 71 | |
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| 72 | The Visualization Manager is set in the main() for interactive session. |
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| 73 | The initialisation of the drawing is done via the command |
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| 74 | /control/execute vis.mac |
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| 75 | |
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| 76 | The detector has a default view which is a longitudinal view of the box. |
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| 77 | |
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| 78 | The tracks are drawn at the end of event, and erased at the end of run. |
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| 79 | Optionaly one can choose to draw all particles, only the charged one, |
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| 80 | or none. This command is defined in EventActionMessenger class. |
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| 81 | |
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| 82 | |
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| 83 | 5- HOW TO START ? |
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| 84 | |
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| 85 | - compile and link to generate an executable |
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| 86 | % cd monopole |
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| 87 | % gmake |
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| 88 | |
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| 89 | - execute Test in 'batch' mode from macro files |
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| 90 | % monopole monopole.in |
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| 91 | |
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| 92 | - execute Test in 'interactive mode' with visualization |
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| 93 | % monopole |
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| 94 | .... |
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| 95 | Idle> type your commands |
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| 96 | .... |
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| 97 | Idle> exit |
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| 98 | |
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| 99 | |
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| 100 | 6- HISTOGRAMS |
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| 101 | |
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| 102 | The result is five histograms: |
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| 103 | - Monopole eneregy deposition in current material |
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| 104 | - dedx for proton |
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| 105 | - dedx for monopole |
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| 106 | - range for proton in current material |
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| 107 | - range for monopole in current material |
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| 108 | |
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| 109 | The histogram is saved in hbook (default monopole.hbook, but can be changed |
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| 110 | using testex/run/HistoName and testex/run/HistoType comands) |
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| 111 | Limit of bin size can be set with testex/run/binSize (default 5mm). Real size |
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| 112 | is chosen as a minimal between this and step limit (see Geometry section) |
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| 113 | |
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| 114 | Note that, by default, histograms are disabled. To activate them, uncomment |
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| 115 | G4ANALYSIS_USE in GNUmakefile. |
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| 116 | |
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| 117 | 7- Using histograms |
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| 118 | ------------------- |
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| 119 | |
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| 120 | By default the histograms are not activated. To activate histograms |
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| 121 | the environment variable G4ANALYSIS_USE should be defined. For instance |
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| 122 | uncomment the flag G4ANALYSIS_USE in GNUmakefile. |
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| 123 | |
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| 124 | To use histograms any of implementations of AIDA interfaces should |
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| 125 | be available (see http://aida.freehep.org). |
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| 126 | |
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| 127 | A package including AIDA and extended interfaces also using Python |
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| 128 | is PI, available from: http://cern.ch/pi . |
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| 129 | |
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| 130 | Once installed PI or PI-Lite in a specified local area $MYPY, it is |
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| 131 | required to add the installation path to $PATH, i.e. for example, |
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| 132 | for release 1.2.1 of PI: |
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| 133 | |
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| 134 | setenv PATH ${PATH}:$MYPI/1.2.1/app/releases/PI/PI_1_2_1/rh73_gcc32/bin |
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| 135 | |
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| 136 | CERN users can use the PATH to the LCG area on AFS. |
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| 137 | |
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| 138 | Before compilation of the example it is optimal to clean up old files: |
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| 139 | |
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| 140 | gmake histclean |
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| 141 | gmake |
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| 142 | |
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| 143 | Before running the example the command should be issued: |
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| 144 | |
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| 145 | eval `aida-config --runtime csh` |
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| 146 | |
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