Gabriele Cosmo
126 lines
4.2 KiB
Plaintext
126 lines
4.2 KiB
Plaintext
//$Id$
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///\file "electromagnetic/TestEm15/.README"
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///\brief Example TestEm15 README page
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/*! \page ExampleTestEm15 Example TestEm15
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How to compute and plot the final state of Multiple Scattering
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considered as an isolated process.
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The method is exposed below : see \ref TestEm15_s4.
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\section TestEm15_s1 GEOMETRY DEFINITION
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It is a single box representing a 'semi infinite' homogeneous medium.
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Two parameters define the geometry :
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- the material of the box,
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- the (full) size of the box.
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The default geometry (100 m of water) is constructed in
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DetectorConstruction, but the above parameters can be changed
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interactively via the commands defined in DetectorMessenger.
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\section TestEm15_s2 PHYSICS LIST
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The physics list contains the standard electromagnetic processes.
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In order not to introduce 'articicial' constraints on the step size,
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there is no limitation from the maximum energy lost per step.
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\section TestEm15_s3 AN EVENT : THE PRIMARY GENERATOR
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The primary kinematic consists of a single particle starting at the edge
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of the box. The type of the particle and its energy are set in
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PrimaryGeneratorAction (1 MeV electron), and can be changed via the G4
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build-in commands of G4ParticleGun class (see the macros provided with
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this example).
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\section TestEm15_s4 PHYSICS
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All discrete processes are inactivated (see provided macros),
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so that Multiple Scattering is 'forced' to determine the first step of
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the primary particle. The step size and the final state are computed
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and plotted. Then the event is immediately killed.
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The result is compared with the 'input' data, i.e. with the cross
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sections stored in the PhysicsTables and used by Geant4.
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The stepMax command provides an additionnal control of the step size of
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the multiple scattering.
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\section TestEm15_s5 HISTOGRAMS
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The test contains 9 built-in 1D histograms, which are managed by the
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HistoManager class and its Messenger. The histos can be individually
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activated with the command :
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\verbatim
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/analysis/h1/set id nbBins valMin valMax unit
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\endverbatim
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where unit is the desired unit for the histo (MeV or keV, etc..)
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(see the macros xxxx.mac).
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- 1 : Multiple Scattering. True step length
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- 2 : Multiple Scattering. Geom step length
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- 3 : Multiple Scattering. Ratio geomSl/trueSl
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- 4 : Multiple Scattering. Lateral displacement: radius
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- 5 : Multiple Scattering. Lateral displac: psi_space
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- 6 : Multiple Scattering. Angular distrib: theta_plane
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- 7 : Multiple Scattering. Phi-position angle
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- 8 : Multiple Scattering. Phi-direction angle
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- 9 : Multiple Scattering. Correlation: cos(phiPos-phiDir)
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The histograms are managed by the HistoManager class and its Messenger.
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The histos can be individually activated with the command :
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\verbatim
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/analysis/h1/set id nbBins valMin valMax unit
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\endverbatim
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where unit is the desired unit for the histo (MeV or keV, deg or mrad, etc..)
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One can control the name of the histograms file with the command:
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\verbatim
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/analysis/setFileName name (default testem15)
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\endverbatim
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It is possible to choose the format of the histogram file : root (default),
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hbook, xml, csv, by using namespace in HistoManager.hh
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It is also possible to print selected histograms on an ascii file:
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\verbatim
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/analysis/h1/setAscii id
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\endverbatim
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All selected histos will be written on a file name.ascii (default testem15)
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\section TestEm15_s6 VISUALIZATION
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The Visualization Manager is set in the main () (see TestEm15.cc).
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The initialisation of the drawing is done via the commands
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/vis/... in the macro vis.mac. To get visualisation:
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\verbatim
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> /control/execute vis.mac
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\endverbatim
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The detector has a default view which is a longitudinal view of the
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box.
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The tracks are drawn at the end of event, and erased at the end of run.
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\section TestEm15_s7- HOW TO START ?
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- Execute TestEm15 in 'batch' mode from macro files :
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\verbatim
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% TestEm15 compt.mac
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\endverbatim
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- Execute TestEm15 in 'interactive mode' with visualization :
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\verbatim
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% TestEm15
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Idle> control/execute vis.mac
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....
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Idle> type your commands
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....
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Idle> exit
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\endverbatim
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*/
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