Gabriele Cosmo
60 lines
2.1 KiB
Plaintext
60 lines
2.1 KiB
Plaintext
In this example, the particle fluence is evaluated for a very simple
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set-up, consisting of one target solid sphere, at the center of which
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a particle is shot (by default along the z-axis).
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The particle fluence is computed in two places: "forward" and "backward",
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defined as the positions immediately after and before, respectively, of
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the target with respect to the direction of the primary particle.
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The particle fluence is estimated by summing the track length in a
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"scoring volume" - i.e. a thin hemisphere shell filled up with G4_Galactic
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(very low density gas) material, immediately outside the target sphere -
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and then dividing for the cubic volume of such scoring volume.
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Complementary information on average multiplicity, average kinetic energy,
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and average total energy flow (i.e. sum of kinetic energies) for the
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particles produced in the target are also computed.
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The particle fluence is evaluated for the following 11 particle types:
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- all
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- electron + positron
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- gamma
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- muon- + muon+
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- neutrino (any flavour and including anti-neutrino)
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- charged pions
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- neutron + anti_neutron
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- proton + anti_proton
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- ion (and anti-ions)
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- otherMeson (e.g. kaons, etc.)
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- otherBaryon (e.g. hyperons, etc.)
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The particle fluence is evaluated for the following 3 kinematical ranges:
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- any kinetic energy
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- kinetic energy < 20 MeV
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- kinetic energy > 20 MeV
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Look for the string "***LOOKHERE***" for those parameters/options that
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are either hardwired in the code (i.e. not available via UI command),
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or default values of UI commands.
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This example uses the physics list factory, therefore you can specify
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the reference physics list you want to use via the PHYSLIST
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environmental variable (by default, if you don't set it, the FTFP_BERT
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physics list is used).
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To build this example:
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mkdir Build; cd Build
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cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo \
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-DGeant4_DIR=/path-to-geant4-libraries ../.
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make
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To run it:
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./Sphere all_together.g4
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which shoots 50 GeV pion- on different target materials, 100 events
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in each run, and print out some information on the particle fluence
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at the end of each run.
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Other macros exist for specific materials.
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