Gabriele Cosmo
62 lines
2.2 KiB
Plaintext
62 lines
2.2 KiB
Plaintext
In this example, the particle fluence is evaluated for a simple set-up,
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consisting of one target solid cylinder, with axis along the z-direction,
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and a beam particle shot before the target along the axis of the target.
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The particle fluence is computed in three places: "upstream", "downstream"
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and "side", defined as the positions immediately after, before and aside,
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respectively, of the target with respect to the direction of the primary
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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 cylinder (for "upstream" and "downstream"
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cases) or a thin hemisphere shell (for the "side" case) filled up with
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G4_Galactic (very low density gas) material, immediately outside the
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target - 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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./Layer 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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