Gabriele Cosmo
107 lines
3.4 KiB
Plaintext
107 lines
3.4 KiB
Plaintext
$Id: README 78110 2013-12-03 14:57:31Z gcosmo $
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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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To define monopole parameters an extra string should be provided
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a) interactive mode by UI command:
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/monopole/setup 2 0 200 GeV (magnetic number, electric number, mass)
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b) batch mode:
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monopole file.mac '2 0 200 GeV'
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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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5- HOW TO START ?
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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 Root file.
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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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