Gabriele Cosmo
142 lines
4.6 KiB
Plaintext
142 lines
4.6 KiB
Plaintext
$Id: README,v 1.1 2007/08/16 10:32:04 vnivanch 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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monopole
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--------
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V.Ivanchenko, M.Vladymyrov
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CERN, Geneva, Switzerland
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Lebedev Physical Institute, Moscow, Russia
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This example is devoted to the energy deposited by classical magnetic
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monopole.
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1- GEOMETRY DEFINITION
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The geometry consists of a single block of a homogenous material,
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placed in a world.
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Four parameters define the geometry :
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- the material of the box
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- the thickness of the box
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- the tranverse dimension of the box
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- the maximal step size in target
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The default is 10 cm of alumunium, step is limited by 5mm.
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Equivalent UI commands are following:
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/testex/det/setMat G4_Al
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/testex/det/sizeX 10 cm
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/testex/det/sizeYZ 5 cm
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/testex/det/setStepSize 5 mm
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The default geometry is constructed in DetectorConstruction class,
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but all of the above parameters can be changed interactively via
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the commands defined in the DetectorMessenger class. After changing
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material and/or dimentions one must update the detector construction:
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/testex/det/update
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2- PHYSICS LIST
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Physics Lists include standard QGSP physics and additional builder
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for monopole physics.
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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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block 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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The default is monopole 100 GeV
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In addition one can define randomly the impact point of the incident
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particle. The corresponding interactive command is built in
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PrimaryGeneratorMessenger class.
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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() for interactive session.
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The initialisation of the drawing is done via the command
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/control/execute vis.mac
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The detector has a default view which is a longitudinal view of the 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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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- HOW TO START ?
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- compile and link to generate an executable
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% cd monopole
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% gmake
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- execute Test in 'batch' mode from macro files
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% monopole monopole.in
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- execute Test in 'interactive mode' with visualization
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% monopole
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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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6- HISTOGRAMS
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The result is five histograms:
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- Monopole eneregy deposition in current material
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- dedx for proton
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- dedx for monopole
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- range for proton in current material
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- range for monopole in current material
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The histogram is saved in hbook (default monopole.hbook, but can be changed
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using testex/run/HistoName and testex/run/HistoType comands)
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Limit of bin size can be set with testex/run/binSize (default 5mm). Real size
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is chosen as a minimal between this and step limit (see Geometry section)
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Note that, by default, histograms are disabled. To activate them, uncomment
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G4ANALYSIS_USE in GNUmakefile.
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7- Using histograms
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-------------------
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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 http://aida.freehep.org).
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A package including AIDA and extended interfaces also using Python
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is PI, available from: http://cern.ch/pi .
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Once installed PI or PI-Lite in a specified local area $MYPY, it is
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required to add the installation path to $PATH, i.e. for example,
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for release 1.2.1 of PI:
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setenv PATH ${PATH}:$MYPI/1.2.1/app/releases/PI/PI_1_2_1/rh73_gcc32/bin
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CERN users can use the PATH to the LCG area on AFS.
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Before compilation of the example it is optimal to clean up old files:
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gmake histclean
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gmake
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Before running the example the command should be issued:
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eval `aida-config --runtime csh`
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