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0001 \page ExampleHadr08 Example Hadr08
0002
0003 This is an example of how to use "generic biasing" to get the following
0004 functionality which is currently not available directly in the Geant4
0005 hadronic framework.
0006
0007 ## PHYSICS LIST
0008
0009 We want to use the physics list FTFP_BERT everywhere in our detector,
0010 except that in one (or more) logical volume(s) we want to use a
0011 different combination of hadronic models, e.g. FTFP + INCLXX
0012 (instead of the default FTFP + BERT), for the final-state generation.
0013
0014 Notice that we use the powerful "generic biasing" machinery available
0015 in Geant4, but the actual weights of all tracks remain to the usual
0016 value (1.0) as in the normal (unbiased) case.
0017
0018 ## MATERIALS AND GEOMETRY DEFINITION
0019
0020 In this example, the detector is very simple:
0021 - a homogeneous block of silicon, as a proxy of a tracker sub-detector;
0022 - followed by a crystal, as a proxy of an electromagnetic calorimeter;
0023 - followed by a homogeneous block of iron, as a proxy of a hadron
0024 calorimeter.
0025 We assume that the block of silicon is where we want to replace FTFP+BERT
0026 with FTFP+INCLXX for the final-state modeling of proton, neutron, pion-
0027 and pion+-inelastic interactions (of any energy).
0028 This silicon layer is made artificially thick (20 cm) in order to have
0029 more hadron inelastic interactions for testing.
0030
0031 This example has been tested only for G4 10.5.p01 and 10.6, but it should
0032 work also for previous recent releases (i.e. 10.4 and 10.3).
0033 The example works in both sequential and multi-threaded modes, and the
0034 CPU overhead due to "generic biasing" for this application seems to be
0035 very small (at the per-cent level).
0036
0037 ## HOW TO START ?
0038
0039 To build it:
0040 ```
0041 mkdir Build; cd Build
0042 cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo \
0043 -DGeant4_DIR=/path-to-geant4-libraries ../.
0044 make
0045 ```
0046
0047 To run it:
0048 ```
0049 ./Hadr08 hadr08.in
0050 ```
0051 which shoot 100 pion+ of 5 GeV kinetic energy.
