| 1 | $Id: README,v 1.21 2008/09/12 18:46:14 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 | TestEm4 |
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| 9 | ------- |
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| 10 | |
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| 11 | Plot energy deposited by 9 MeV photon beam in an homogeneous medium. |
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| 12 | |
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| 13 | 1- GEOMETRY DEFINITION |
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| 14 | |
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| 15 | It is a cylinder of 5 cm radius filled with C6F6. |
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| 16 | |
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| 17 | 2- PHYSICS LIST |
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| 18 | |
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| 19 | The particle list contains only gamma, electron,positron. |
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| 20 | The physics list contains the 'standard' electromagnetic processes. |
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| 21 | |
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| 22 | 3- AN EVENT : THE PRIMARY GENERATOR |
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| 23 | |
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| 24 | The primary kinematic is a single 9 MeV gamma randomly shooted at the |
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| 25 | middle of the cylinder. |
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| 26 | |
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| 27 | 4- VISUALIZATION |
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| 28 | |
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| 29 | The Visualization Manager is set in the main(). |
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| 30 | The initialisation of the drawing is done via the commands |
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| 31 | /vis/.. in the macro vis.mac. This macro is |
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| 32 | automatically read from the main in case of interactive running mode. |
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| 33 | |
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| 34 | The detector has a default view which is a transversal view of the |
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| 35 | cylinder. |
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| 36 | |
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| 37 | The tracks are drawn at the end of event, and erased at the end of run. |
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| 38 | Optionaly one can choose to draw all particles, only the charged one, |
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| 39 | or none. This command is defined in EventActionMessenger class. |
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| 40 | |
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| 41 | 5- PHYSICS SURVEY |
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| 42 | |
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| 43 | The energy deposited in C6F6 is histogramed. |
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| 44 | |
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| 45 | 6- HOW TO START ? |
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| 46 | |
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| 47 | - compile and link to generate an executable |
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| 48 | % cd examples/extended/electromagnetic/TestEm4 |
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| 49 | % gmake |
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| 50 | |
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| 51 | - execute TestEm4 in 'batch' mode from macro files |
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| 52 | % TestEm4 TestEm4.in |
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| 53 | |
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| 54 | - execute TestEm4 in 'interactive mode' with visualization |
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| 55 | % TestEm4 |
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| 56 | .... |
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| 57 | Idle> type your commands |
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| 58 | .... |
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| 59 | Idle> exit |
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| 60 | |
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| 61 | - visualize the histogram (paw) |
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| 62 | paw> h/file 1 testem4.hbook |
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| 63 | paw> option stat |
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| 64 | paw> option logy |
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| 65 | paw> h/pl 1 |
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| 66 | |
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| 67 | |
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| 68 | 7- USING HISTOGRAMS |
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| 69 | |
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| 70 | By default the histograms are not activated. To activate histograms |
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| 71 | the environment variable G4ANALYSIS_USE should be defined. For instance |
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| 72 | uncomment the flag G4ANALYSIS_USE in GNUmakefile. |
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| 73 | |
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| 74 | Before compilation of the example it is optimal to clean up old files: |
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| 75 | gmake histclean |
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| 76 | gmake |
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| 77 | |
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| 78 | It is possible to choose the format of the histogram file : |
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| 79 | hbook, root (default), XML |
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| 80 | comment/uncomment 1 line in the constructor of RunAction. |
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| 81 | |
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| 82 | To use histograms, at least one of the AIDA implementations should be |
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| 83 | available. See InstallAida.txt |
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| 84 | |
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