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0001 =========================================================
0002 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
0003 =========================================================
0004
0005 -------------------------
0006 FissionFragment Example
0007
0008 B.Wendt
0009 brycen.linn.wendt@cern.ch
0010 -------------------------
0011
0012 This example demonstrates an application of the fission fragment model in the
0013 NeutronHP model. This example is capable of using both models, but is designed
0014 around the Wendt Fission Model. A warning will be shown if the environment
0015 variable that enables the Wendt fission model is not set.
0016
0017
0018 1 - EXECUTION
0019
0020 A - Enable the following UI command :
0021
0022 /process/had/particle_hp/use_Wendt_fission_model true
0023
0024 to use the alternative Wendt fission model contained within the
0025 NeutronHP model for simulating fission events
0026 (else, the default fission model will be used).
0027
0028 B - COMMAND LINE ARGUMENTS
0029 The example can be run without any input arguments. However, a few options
0030 are available:
0031 -i ARG : run in batch mode from script file ARG
0032 -o ARG : write output to file ARG
0033 (defaults to FF_Neutron_HP.out)
0034 -n ARG : multithreading with ARG number of threads
0035 (only works if Geant4 was compiled with multithreading
0036 enabled)
0037
0038 No output is currently generated, although the argument is provided. It is
0039 anticipated that future versions will provide some form of output
0040 summarizing the results of the simulation.
0041
0042 C - INTERACTIVE
0043 No specialized UI commands are currently provided.
0044
0045 To run the simulation, use the standard UI command (after eventually
0046 the above UI command to use the alternative Wendt fission model):
0047
0048 /run/beamOn
0049
0050 D - BATCH
0051 Use the macro batch.in :
0052
0053 ./FissionFragment batch.in
0054
0055 2 - GEOMETRY
0056
0057 The geometry is constructed in the FFDetectorConstruction class. The setup is
0058 based on a subcritical assembly design.
0059
0060 A - MATERIALS
0061 This example requires a number of materials. They are loaded or constructed
0062 in the "DefineMaterials" function. A few of the materials are obtained from
0063 the NIST database (ref. Geant4 User's Guide for Application Developers,
0064 Appendix: Geant4 Materials Database). These materials are:
0065 - Air
0066 - Aluminum
0067 - Graphite
0068 - Polyethylene
0069 - Stainless steel
0070 - Water
0071
0072 Not all of the necessary materials were available from the NIST database,
0073 and were constructed manually from the estimated isotopics. These materials
0074 are:
0075 - 20% U235 enriched uranium
0076 - 93% B10 enriched BF3
0077
0078 B - Volumes
0079 The world is composed of air instead of a vacuum to provide room return.
0080
0081 The subcritical assembly is a water-filled aluminum tank.
0082
0083 The fuel plates are composed of aluminum-clad uranium meat, and are
0084 completely submersed in the water of the subcritical assembly.
0085
0086 An AmBe neutron source is placed in the exact center of the fuel plate
0087 loading configuration. The material is currently modeled as steel until
0088 more exact specifics of the AmBe isotopics can be obtained.
0089
0090 The subcritical assembly rests on top of a graphite pile for moderation and
0091 shielding.
0092
0093
0094 3 - PHYSICS LIST
0095
0096 The particle's type and the physic processes which will be available
0097 in this example are set in the QGSP_BIC_HP physics list.
0098
0099
0100 4 - PRIMARY GENERATOR
0101
0102 The primary generator is defined in the FFPrimaryGeneratorAction class.
0103 The default particle is a 4.5 MeV neutron originating from the
0104 "NeutronSource" volume. The particles initial direction is isotropically
0105 sampled.
0106
0107
0108 5 - DETECTOR RESPONSE
0109
0110 The scoring method is yet to be implemented, although the BF3 detector is
0111 already included in the detector construction.
0112
0113
0114 6 - VISUALISATION
0115 An example "vis.mac" will be included in a future release. For now, please
0116 refer to other examples for a few suggestions.
0117
0118
