Gabriele Cosmo
52 lines
1.9 KiB
Markdown
52 lines
1.9 KiB
Markdown
\page ExampleRE07 Example RE07
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This example is based on extended/electromagnetic/TestEm3 and
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demonstrates how to register specialized tracking managers for
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a particle or a set of particles.
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## Geometry definition
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The geometry of a simplified sampling calorimeter is used as
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in [TestEm3](../../html_TestEm3/html/ExampleTestEm3.html), please refer to its
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documentation for more details.
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The same UI commands exist for modifying the geometry (number
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of layers and absorbers, material and its thickness), without
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the /testem/ prefix.
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In addition to the definition of the volumes, this example adds
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two regions, "Front" and "Back", which contain the front and
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rear half of the calorimeter.
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## Physics lists
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By default, the example uses G4EmStandardPhysics and registers
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processes to the G4ProcessManager. This can be changed with the
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`/setMode` UI command. Possible values are:
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- processes: use G4EmStandardPhysics, the default
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- tracking: use the same physics as G4EmStandardPhysics, but
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implemented as a specialized tracking manager for
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electrons, positrons, and gammas; see the file
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EmStandardPhysicsTrackingManager.cc for details.
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- specialized: use a specialized tracking manager for gammas; for
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the purpose of demonstration,
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- it uses G4EmStandardPhysics as the basis,
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- defers processing of gammas with a kinetic energy
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of more than 100 MeV,
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- implement a specialized stepping loop for the
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"Back" region of the detector.
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See the file SpecializedTrackingManager.cc for more
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details on the exact implementation.
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## How to start?
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This example comes with one macro file for each of the described
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modes (processes.mac, specialized.mac, tracking.mac)
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that can be passed as a parameter to the executable:
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```
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% ./exampleRE07 processes.mac
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% ./exampleRE07 specialized.mac
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% ./exampleRE07 tracking.mac
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```
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