1 | $Id: README,v 1.1 2007/08/16 10:32:04 vnivanch 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 | 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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48 | |
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49 | 3- AN EVENT : THE PRIMARY GENERATOR |
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50 | |
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51 | The primary kinematic consists of a single particle which hits the |
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52 | block perpendicular to the input face. The type of the particle |
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53 | and its energy are set in the PrimaryGeneratorAction class, and can |
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54 | changed via the G4 build-in commands of ParticleGun class (see |
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55 | the macros provided with this example). |
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56 | The default is monopole 100 GeV |
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57 | |
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58 | In addition one can define randomly the impact point of the incident |
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59 | particle. The corresponding interactive command is built in |
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60 | PrimaryGeneratorMessenger class. |
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61 | |
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62 | A RUN is a set of events. |
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63 | |
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64 | |
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65 | 4- VISUALIZATION |
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66 | |
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67 | The Visualization Manager is set in the main() for interactive session. |
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68 | The initialisation of the drawing is done via the command |
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69 | /control/execute vis.mac |
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70 | |
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71 | The detector has a default view which is a longitudinal view of the box. |
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72 | |
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73 | The tracks are drawn at the end of event, and erased at the end of run. |
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74 | Optionaly one can choose to draw all particles, only the charged one, |
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75 | or none. This command is defined in EventActionMessenger class. |
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76 | |
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77 | |
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78 | 5- HOW TO START ? |
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79 | |
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80 | - compile and link to generate an executable |
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81 | % cd monopole |
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82 | % gmake |
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83 | |
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84 | - execute Test in 'batch' mode from macro files |
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85 | % monopole monopole.in |
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86 | |
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87 | - execute Test in 'interactive mode' with visualization |
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88 | % monopole |
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89 | .... |
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90 | Idle> type your commands |
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91 | .... |
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92 | Idle> exit |
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93 | |
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94 | |
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95 | 6- HISTOGRAMS |
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96 | |
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97 | The result is five histograms: |
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98 | - Monopole eneregy deposition in current material |
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99 | - dedx for proton |
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100 | - dedx for monopole |
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101 | - range for proton in current material |
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102 | - range for monopole in current material |
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103 | |
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104 | The histogram is saved in hbook (default monopole.hbook, but can be changed |
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105 | using testex/run/HistoName and testex/run/HistoType comands) |
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106 | Limit of bin size can be set with testex/run/binSize (default 5mm). Real size |
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107 | is chosen as a minimal between this and step limit (see Geometry section) |
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108 | |
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109 | Note that, by default, histograms are disabled. To activate them, uncomment |
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110 | G4ANALYSIS_USE in GNUmakefile. |
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111 | |
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112 | 7- Using histograms |
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113 | ------------------- |
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114 | |
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115 | By default the histograms are not activated. To activate histograms |
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116 | the environment variable G4ANALYSIS_USE should be defined. For instance |
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117 | uncomment the flag G4ANALYSIS_USE in GNUmakefile. |
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118 | |
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119 | To use histograms any of implementations of AIDA interfaces should |
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120 | be available (see http://aida.freehep.org). |
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121 | |
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122 | A package including AIDA and extended interfaces also using Python |
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123 | is PI, available from: http://cern.ch/pi . |
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124 | |
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125 | Once installed PI or PI-Lite in a specified local area $MYPY, it is |
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126 | required to add the installation path to $PATH, i.e. for example, |
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127 | for release 1.2.1 of PI: |
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128 | |
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129 | setenv PATH ${PATH}:$MYPI/1.2.1/app/releases/PI/PI_1_2_1/rh73_gcc32/bin |
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130 | |
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131 | CERN users can use the PATH to the LCG area on AFS. |
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132 | |
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133 | Before compilation of the example it is optimal to clean up old files: |
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134 | |
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135 | gmake histclean |
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136 | gmake |
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137 | |
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138 | Before running the example the command should be issued: |
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139 | |
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140 | eval `aida-config --runtime csh` |
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141 | |
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