Gabriele Cosmo
135 lines
4.5 KiB
Plaintext
135 lines
4.5 KiB
Plaintext
//$Id$
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///\file "electromagnetic/TestEm10/.README"
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///\brief Example TestEm10 README page
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/*! \page ExampleTestEm10 Example TestEm10
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Test for investigation of ionisation in thin absorbers, transition
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and synchrotron radiations. Default setup for "TestEm10.in" and "TestEm10.large_N.in" is
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the experiment for XTR with NIM A294 (1990) 465-472 (fig. 11) setup
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\section TestEm10_s0 INTRODUCTION
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The parameterisations models can be changed simply with:
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\verbatim
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Idle> /XTRdetector/setModel i (i = 1 to 10)
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\endverbatim
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It is NOT needed (and not recommended) to issue the command
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/XTRdetector/update if just the model is changed.
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See macro file "TestEm10.in" for an example.
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\section TestEm10_s1 GEOMETRY DEFINITION
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The "absorber" is a tube made of a given material.
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Three parameters define the absorber :
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- the material of the absorber,
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- the thickness of an absorber,
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- the transverse size of the absorber (the input face is a square).
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The volume "World" contains the "absorber".
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In this test the parameters of the "World" can be changed , too.
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In addition a transverse uniform magnetic field can be applied.
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The default geometry is constructed in Em10DetectorConstruction class,
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but all the parameters can be changed via
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the commands defined in the Em10DetectorMessenger class.
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\section TestEm10_s2 AN EVENT : THE PRIMARY GENERATOR
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The primary kinematic consists of a single particle which hits the
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absorber perpendicular to the input face. The type of the particle
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and its energy are set in the Em10PrimaryGeneratorAction class, and can
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be changed via the G4 build-in commands of G4ParticleGun class (see
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the macros provided with this example).
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A RUN is a set of events.
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\section TestEm10_s3 DETECTOR RESPONSE
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Here we test G4PAIionisation , G4IonisationByLogicalVolume and
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transition radiation processes
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A HIT is a record, event per event , of all the
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informations needed to simulate and analyse the detector response.
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In this example a Em10CalorHit is defined as a set of 2 informations:
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- the total energy deposit in the absorber,
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- the total tracklength of all charged particles in the absorber,
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Therefore the absorber is declared
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'sensitive detector' (SD), see Em10CalorimeterSD, which means they can contribute to the hit.
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At the end of a run, from the histogram(s), one can study
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different physics quantities such as :
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- angle distribution,
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- energy deposit,
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- transmission/backscattering,
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- ...
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The test contains 10 built-in histograms, which can be activated by
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interactive commands (see the macros runxx.mac for details).
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The histogram files can be viewed using PAW e.g with the commands
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\verbatim
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paw> h/file 1 geant4.plot01 or g4.p11
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paw> option stat
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paw> h/pl 1
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\endverbatim
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\section TestEm10_s4 PHYSICS DEMO
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The particle's type and the physic processes which will be available
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in this example are set in Em10PhysicsList class.
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The messenger classes introduce interactive commands . Using these
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commands the geometry of the detector, the data of the primary
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particle, the limits of the histograms , etc. can be changed.
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\section TestEm10_s5- HOW TO START ?
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- Execute TestEm10 in 'batch' mode from macro files e.g.
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\verbatim
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% TestEm10 run11.mac
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\endverbatim
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- Execute TestEm10 in 'interactive' mode with visualization e.g.
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\verbatim
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% TestEm10
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....
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Idle> type your commands
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....
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\endverbatim
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\section TestEm10_s6 List of the built-in histograms
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- 1. number of (tracking) steps/event
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- 2. energy deposit distribution in the absorber (in MeV)
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- 3. angle distribution of the primary particle at the exit
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of the absorber (deg)
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- 4. distribution of the lateral displacement at exit(mm)
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- 5. kinetic energy of the transmitted primaries (MeV)
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- 6. angle distribution of the backscattered primaries (deg)
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- 7. kinetic energy of the backscattered primary particles (MeV)
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- 8. kinetic energy of the charged secondary particles (MeV)
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- 9. z distribution of the secondary charged vertices (mm)
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- 10. kinetic energy of the photons escaping the absorber (MeV)
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\subsection TestEm10_sub_s61 Using histograms
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By default the histograms are not activated. To activate histograms
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the environment variable G4ANALYSIS_USE should be defined. For instance
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uncomment the flag G4ANALYSIS_USE in GNUmakefile.
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To use histograms any of implementations of AIDA interfaces should
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be available. See InstallAida.txt
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*/
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