Gabriele Cosmo
85 lines
3.6 KiB
Markdown
85 lines
3.6 KiB
Markdown
\page Examples_gflash Category "parameterisations/gflash"
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These examples demonstrate the use of the GFLASH parameterisation library.
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They use the GFLASH equations (hep-ex/0001020, Grindhammer & Peters)
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to parametrise electromagnetic showers in matter.
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In these examples the calorimeter is a simple cube,
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which consists of 10 x 10 crystals of PbWO4 (CMS like).
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Briefly, whenever a e-/e+ enters the calorimeter, it is parametrised if it
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has a minimum energy and the shower is expected to be contained
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in the calorimeter (so called " parameterisation envelope").
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If this is fullfilled the particle is killed, as well as all secondaries,
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and the energy is deposited according to the GFLASH equations.
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The examples show how to interface GFLASH to your application.
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The simulation time is measured, so the user can see immediately
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the speed up by using GFLASH.
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Geometry and parametrisation is defined in different ways in the set of three equivalent
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(in terms of produced showers) examples: \ref Examplegflash1, \ref Examplegflash2 and
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\ref Examplegflash3, to demonstrate
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how to use the parametrisation, sensitive detectors and parallel geometry.
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The classes which are the same in all three examples have the names with ExGflash prefix while
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the names of classes specific to each example have the prexix ExGflash[1,2,3].
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\ref Examplegflasha - allow histogramming of show profiles and fine tuning
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of gflash parametrization for homogeneous medium.
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Note: Instead of particle gun the gps class is used here for particle generation.
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## Briefly
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Table below presents in which world/geometry (mass or parallel) each of the elements is defined.
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| Example | gflash1 | gflash2 | gflash3 |
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|------------------------------|----------|--------------|--------------|
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| Block of material | mass geo | mass geo | mass geo |
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| Crystals (readout geometry) | mass geo | mass geo | parallel geo |
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| Sensitive detector | mass geo | mass geo | parallel geo |
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| Envelope for parametrisation | mass geo | parallel geo | mass geo |
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### \ref Examplegflash1
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Uses only the mass geometry, with each crystal defined as a volume,
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with parametrisation attached to the envelope in the mass geometry.
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Geometry and sensitive detector are defined in:
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- ExGflash1DetectorConstruction
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- ExGflash1SensitiveDetector
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### \ref Examplegflash2
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Uses mass geometry to create volumes and to create a sensitive detector
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for storing hits, but parametrisation is attached to the envelope
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in the parallel geometry (see also examples/extended/parametrisations/Par01).
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Geometry and sensitive detector are defined in:
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- ExGflash2DetectorConstruction
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- ExGflash2ParallelWorld
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- ExGflash2SensitiveDetector
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### \ref Examplegflash3
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Uses mass geometry to create the main volume (homogeneous material) and use it
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as an envelope for the parametrisation, but the readout geometry (crystals)
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are defined in the parallel geometry, together with the sensitive detector
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to store the hits.
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Geometry and sensitive detector are defined in:
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- ExGflash3DetectorConstruction
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- ExGflash3ParallelWorld
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- ExGflash3SensitiveDetector
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## Macros
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- vis.mac - macro for use in interactive mode (default, if no arguments are specified)
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- test.mac - macro for tests: 50 GeV electrons are shot in the direction of the detector
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(along z axis), 10 times. As they enter the parametrisation envelope,
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the GFlash parametrisation is invoked and energy is deposited.
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The results are printed out:
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- energy in the most central crystal
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- energy in 3x3 crystals
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- energy in 5x5 crystals
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- number of created deposits
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- simulation time per event
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