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1 =========================================================
2 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
3 =========================================================
4
5
6 Example extensibleFactory
7
8 R. Hatcher
9 Fermilab
10 (based on Hadr00 by V. Ivantchenko, CERN)
11
12 Examples in the physicslist category show the possible ways how to define
13 a physics list from Geant4 physics constructors. This example demonstrates
14 the usage of g4alt::G4PhysListFactory to build the concrete physics list.
15
16 Physics List can be defined by its name given by the -p argument of the of the
17 run command or by the PHYSLIST environment variable.
18
19 ./extensibleFactory -m my.macro [ -p QGSP_BERT ] \
20 [ -v | --verbose ] [ -h | --help ]
21
22 By default, FTFP_BERT Physics List will be instantiated if
23 -p argument is not set and the PHYSLIST environment variable is not defined.
24 This is the system default, but can be overridden using the
25 SetDefaultReferencePhysList() method on the factory (see the code).
26
27 The extensible factory allows users to define and register their own physics
28 lists. This example shows the addtional a new list "MySpecialPhysList".
29
30 ./extensibleFactory -m run.mac -p MySpecialPhysList
31
32 The extensible factory also allows for the extension of lists by adding
33 (using "+" as a separator) or replacing (using "_" as a separator)
34 specific physics constructors. These can be specified by
35 pre-defining a short name (e.g. RADIO for G4RadioactiveDecayPhysics) or
36 providing the full class name.
37
38 ./extensibleFactory -m run.mac -p FTFP_BERT_EMX+G4OpticalPhysics+RADIO
39
40 uses the FTFP_BERT physics list as a base
41 * replaces the list's standard EM portion with
42 G4EmStandardPhysics_option2 ( standard EMX extension )
43 * adds G4OpticalPhysics
44 * adds G4RadioactiveDecayPhysics (RADIO defined in code to map to this)
45
46 The same experimental setup is used for all examples in the physicslist
47 category:
48
49 1- Detector description
50 -----------------------
51
52 The geometry (defined in the DetectorConstruction class) consists in a box of
53 scintillator material (CsI) followed by a thin box of air (screen) which is used
54 to simplify scoring.
55
56
57 2- Primary generator
58 --------------------
59
60 The primary generator is defined with usage of G4ParticleGun.
61 The default particle is proton which hits the box perpendicular to the input face.
62 The type of the particle and its energy are set in the PrimaryGeneratorAction class, and can
63 be changed via the G4 built-in commands of the G4ParticleGun class.
64
65
66 3- Scoring (ntuples)
67 --------------------
68
69 The screen volume is associated with a sensitive detector, ScreenSD,
70 which accounts the following particle properties:
71 - trackID
72 - particle PDG encoding
73 - particle kinetic energy
74 - particle X,Y position
75 - particle time
76
77 The scored quantities are filled in the Screen ntuple, which is defined using G4AnalysisManager
78 in RunAction class. The ntuple is saved in a Root file, which name is set to be equal to the
79 example name in main () function.
80
81 4- How to build
82 ----------------
83
84 An additional step is needed when building the example with GNUmake
85 due to using the extra shared directory:
86 % cd path_to_example/example
87 % gmake setup
88 % gmake
89
90 This will copy the files from shared in the example include and src;
91 to remove these files:
92 % gmake clean_setup
93
