Gabriele Cosmo
70 lines
2.7 KiB
Plaintext
70 lines
2.7 KiB
Plaintext
In this example, the particle fluence is evaluated for a set-up made
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of one target solid sphere, at the center of which a particle is shot
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(by default along the z-axis), followed by two outer, target solid sphere
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shells, with space in between filled up with G4_Galactic material - i.e.
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very low density gas.
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The three targets mimic a very simplified collider detector, with the
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first (inner) target as a proxy for a Tracker, the second (middle) target
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as a proxy for an electromagnetic (homogeneous) calorimeter, and the
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third and last (outer) target as a proxy for a hadronic (homogeneous)
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calorimeter.
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The particle fluence is computed in six places: immediately outside
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each of the three targets (inner, middle and outer targets), and for
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each of them, in the "forward" and "backward" hemispheres (i.e. immediately
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after and before, respectively, of the target with respect to the direction
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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 one of the targets -
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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 three targets 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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./ConcentricSpheres all_together.g4
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which shoots 50 GeV pion- on three different configurations
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(Scintillator-PbWO4-Copper, LiquidArgon-Lead-Iron, Silicon-Tungsten-Tungsten),
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with 100 events in each run, and print out some information on the
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particle fluence at the end of each run.
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Other macros exist for each of these specific configurations.
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