Gabriele Cosmo
135 lines
4.7 KiB
Plaintext
135 lines
4.7 KiB
Plaintext
$Id: README,v 1.9 2002/12/11 17:12:20 maire Exp $
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-------------------------------------------------------------------
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=========================================================
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Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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=========================================================
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TestEm2
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-------
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This example allows to do the shower development of an single primary
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particle, and to survey the physics processes which occur,
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with printing and visualization.
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1- GEOMETRY DEFINITION
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The geometry consists of a cylinder of homegenous material.
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This cylinder is replicated longitudinaly (slice) and radialy (ring).
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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: /testem/det/setMat PbWO4
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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: /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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An uniform magnetic field along the cylinder axis can be set.
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eg: /testem/det/setField 5 tesla
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2- PHYSICS LISTS
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Physics Lists are subdivided on 4 following modules:
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1. "particles" - particle definitions
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2. "general" - decays and transportation
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3. "standard" (alternative) - standard EM physics
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4. "model" (alternative) - standard EM physics using model approach
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3- 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 ParticleGun 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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4- VISUALIZATION
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The Visualization Manager is set in the main().
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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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PreInit or Idle > /control/execute vis.mac
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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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5- 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: /testem/phys/setCuts 100 microm
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/run/initialize
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6- HOW TO START ?
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- compile and link to generate an executable
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% cd TestEm2
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% gmake
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- execute TestEm2 in 'batch' mode from macro files
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% TestEm2 run01.mac
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- execute TestEm2 in 'interactive mode' with visualization
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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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7- HISTOGRAMS
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TestEm2 produces several histo which are saved as testem2.paw
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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 : cumulated longitudinal energy profile
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6 : rms of cumulated longitudinal energy profile
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7 : gamma's flux
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8 : positron's flux
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9 : electron's flux
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10 : radial energy profile
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11 : cumulated radial energy profile
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12 : rms of cumulated radial energy profile
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Note that histograms are disabled via the flag G4NOHIST in the GNUmakefile.
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8- Using the Anaphe implementation of the AIDA 3.0 histograms:
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--------------------------------------------------------------
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In order to use the Anaphe implementation of the AIDA 3.0 interfaces,
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the 'aida-config' command (which is used in the GNUmakefile) is
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available at:
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/afs/cern.ch/sw/lhcxx/share/LHCXX/latest/scripts/aida-config
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In order to run the executable, you need to source the following
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script (once):
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$HOME/bin/setupAnaphe.csh (or $HOME/bin/setupAnaphe)
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At cern 'setupAnaphe' is available at:
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/afs/cern.ch/sw/lhcxx/share/LHCXX/latest/scripts/setupAnaphe.csh
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(or /afs/cern.ch/sw/lhcxx/share/LHCXX/latest/scripts/setupAnaphe)
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