Gabriele Cosmo
159 lines
4.9 KiB
Plaintext
159 lines
4.9 KiB
Plaintext
//$Id$
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///\file "electromagnetic/TestEm2/.README"
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///\brief Example TestEm2 README page
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/*! \page ExampleTestEm2 Example TestEm2
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How to do shower profiles in an homogenous medium, with virtual
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voxelisation.
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\section TestEm2_s1 GEOMETRY DEFINITION
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The geometry consists of a cylinder of homegenous material.
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The default geometry is constructed in DetectorConstruction class,
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but all of the above parameters can be modified interactively via
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the commands defined in the DetectorMessenger class.
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Material can be choosen: Air Water lAr Al Fe BGO PbWO4 Pb.
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eg:
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\verbatim
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/testem/det/setMat PbWO4
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\endverbatim
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The cylinder is virtually sliced longitudinaly (slice) and radialy (ring).
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The size of the slices and rings are expressed in radiation length units
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and can be changed.
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eg:
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\verbatim
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/testem/det/setLbin 20 1. ---> 20 slices of 1. radl
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/testem/det/setRbin 5 0.25 ---> 5 rings of 0.25 radl
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/testem/det/update ---> rebuild the geometry
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\endverbatim
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(MaxBin = 500 in both directions)
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An uniform magnetic field along the cylinder axis can be set.
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eg:
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\verbatim
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/testem/det/setField 5 tesla
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\endverbatim
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\section TestEm2_s2 PHYSICS LISTS
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Physics lists can be local (eg. in this example) or from G4 kernel
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physics_lists subdirectory.
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Local physics lists:
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- "local" standard EM physics with current 'best' options setting.
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these options are explicited in PhysListEmStandard
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From geant4/source/physics_lists/builders:
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- "emstandard_opt0" recommended standard EM physics for LHC
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- "emstandard_opt1" best CPU performance standard physics for LHC
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- "emstandard_opt2"
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- "emstandard_opt3" best current advanced EM options.
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analog to "local" above
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Physics lists and options can be (re)set with UI commands
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Please, notice that options set through G4EmProcessOPtions are global, eg
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for all particle types. In G4 builders, it is shown how to set options per
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particle type.
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\section TestEm2_s3 AN EVENT : THE PRIMARY GENERATOR
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The primary kinematic consists of a single particle which hits the
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cylinder perpendicular to the input face. The type of the particle
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and its energy are set in the PrimaryGeneratorAction class, and can
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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 TestEm2_s4 VISUALIZATION
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The Visualization Manager is set in the main () (see TestEm2.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. In interactive session:
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\verbatim
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PreInit or Idle > /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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cylinder.
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The tracks are drawn at the end of event, and erased at the end of run.
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Optionaly one can choose to draw all particles, only the charged one,
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or none. This command is defined in EventActionMessenger class.
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\section TestEm2_s5 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 PhysicsList class.
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In addition a build-in interactive command (/process/inactivate proname)
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allows to activate/inactivate the processes one by one.
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The threshold for producing secondaries can be changed.
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eg:
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\verbatim
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/testem/phys/setCuts 100 microm
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/run/initialize
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\endverbatim
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The shower profiles are histogramed, if histograming is activated.
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They can be also printed with the command /testem/run/verbose 1
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\section TestEm2_s6 HOW TO START ?
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- Execute TestEm2 in 'batch' mode from macro files
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\verbatim
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% TestEm2 run01.mac
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\endverbatim
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- Execute TestEm2 in 'interactive mode' with visualization
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\verbatim
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% TestEm2
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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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\section TestEm2_s7 HISTOGRAMS
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TestEm2 produces several histograms:
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Content of these histo:
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- 1 : energy deposit per event
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- 2 : charged track length per event
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- 3 : neutral track length per event
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- 4 : longitudinal energy profile
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- 5 : rms of longitudinal energy profile
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- 6 : cumulated longitudinal energy profile
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- 7 : rms of cumulated longitudinal energy profile
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- 8 : radial energy profile
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- 9 : rms of radial energy profile
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- 10 : cumulated radial energy profile
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- 11 : rms of cumulated radial energy profile
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To define the output file name with histograms, use the UI command :
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\verbatim
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/testem/histo/setFileName name
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\endverbatim
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The format of the histogram file can be : root (default),
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hbook, xml, csv, by selecting g4nnn.hh in RunAction.hh
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\subsection TestEm2_subs2 Using hbook format
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Need a special treatement : the Cern Library must be installed and the
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environment variable CERNLIB correctly set. Then, *before* compiling,
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activate G4_USE_HBOOK in GNUmakefile and g4hbook.hh in RunAction.hh
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*/
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