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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