| [1337] | 1 | $Id: README,v 1.21 2008/09/12 18:46:14 maire 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 | 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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| [1337] | 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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| [807] | 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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| [1337] | 83 | available. See InstallAida.txt
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| [807] | 84 |
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