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1 =========================================================
2 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
3 =========================================================
4
5 -------------------------
6 FissionFragment Example
7
8 B.Wendt
9 brycen.linn.wendt@cern.ch
10 -------------------------
11
12 This example demonstrates an application of the fission fragment model in the
13 NeutronHP model. This example is capable of using both models, but is designed
14 around the Wendt Fission Model. A warning will be shown if the environment
15 variable that enables the Wendt fission model is not set.
16
17
18 1 - EXECUTION
19
20 A - Enable the following UI command :
21
22 /process/had/particle_hp/use_Wendt_fission_model true
23
24 to use the alternative Wendt fission model contained within the
25 NeutronHP model for simulating fission events
26 (else, the default fission model will be used).
27
28 B - COMMAND LINE ARGUMENTS
29 The example can be run without any input arguments. However, a few options
30 are available:
31 -i ARG : run in batch mode from script file ARG
32 -o ARG : write output to file ARG
33 (defaults to FF_Neutron_HP.out)
34 -n ARG : multithreading with ARG number of threads
35 (only works if Geant4 was compiled with multithreading
36 enabled)
37
38 No output is currently generated, although the argument is provided. It is
39 anticipated that future versions will provide some form of output
40 summarizing the results of the simulation.
41
42 C - INTERACTIVE
43 No specialized UI commands are currently provided.
44
45 To run the simulation, use the standard UI command (after eventually
46 the above UI command to use the alternative Wendt fission model):
47
48 /run/beamOn
49
50 D - BATCH
51 Use the macro batch.in :
52
53 ./FissionFragment batch.in
54
55 2 - GEOMETRY
56
57 The geometry is constructed in the FFDetectorConstruction class. The setup is
58 based on a subcritical assembly design.
59
60 A - MATERIALS
61 This example requires a number of materials. They are loaded or constructed
62 in the "DefineMaterials" function. A few of the materials are obtained from
63 the NIST database (ref. Geant4 User's Guide for Application Developers,
64 Appendix: Geant4 Materials Database). These materials are:
65 - Air
66 - Aluminum
67 - Graphite
68 - Polyethylene
69 - Stainless steel
70 - Water
71
72 Not all of the necessary materials were available from the NIST database,
73 and were constructed manually from the estimated isotopics. These materials
74 are:
75 - 20% U235 enriched uranium
76 - 93% B10 enriched BF3
77
78 B - Volumes
79 The world is composed of air instead of a vacuum to provide room return.
80
81 The subcritical assembly is a water-filled aluminum tank.
82
83 The fuel plates are composed of aluminum-clad uranium meat, and are
84 completely submersed in the water of the subcritical assembly.
85
86 An AmBe neutron source is placed in the exact center of the fuel plate
87 loading configuration. The material is currently modeled as steel until
88 more exact specifics of the AmBe isotopics can be obtained.
89
90 The subcritical assembly rests on top of a graphite pile for moderation and
91 shielding.
92
93
94 3 - PHYSICS LIST
95
96 The particle's type and the physic processes which will be available
97 in this example are set in the QGSP_BIC_HP physics list.
98
99
100 4 - PRIMARY GENERATOR
101
102 The primary generator is defined in the FFPrimaryGeneratorAction class.
103 The default particle is a 4.5 MeV neutron originating from the
104 "NeutronSource" volume. The particles initial direction is isotropically
105 sampled.
106
107
108 5 - DETECTOR RESPONSE
109
110 The scoring method is yet to be implemented, although the BF3 detector is
111 already included in the detector construction.
112
113
114 6 - VISUALISATION
115 An example "vis.mac" will be included in a future release. For now, please
116 refer to other examples for a few suggestions.
117
118
