Gabriele Cosmo
138 lines
5.0 KiB
Plaintext
138 lines
5.0 KiB
Plaintext
-------------------------------------------------------------------
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==================================================
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Geant4 - an Object-Oriented Toolkit for Simulation
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==================================================
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OpNovice2
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---------
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Investigate optical properties and parameters. Details of optical
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photon boundary interactions on a surface are recorded. Details
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of optical photon generation and transport are recorded.
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1- GEOMETRY DEFINITION
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The geometry consists of a cube "box" with a side of 2 m inside
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the world cube of side 20 m. Optical properties of the box, the world,
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and the surface may be set interactively via the commands defined
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in the DetectorMessenger class.
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Material properties may be added using the macro commands:
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# for the box:
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/opnovice2/boxProperty NAME EN1 V1 EN2 V2 [ .. ENn Vn]
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/opnovice2/boxConstProperty NAME VALUE
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# for the world:
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/opnovice2/worldProperty NAME EN1 V1 EN2 V2 [ .. ENn Vn]
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/opnovice2/worldConstProperty NAME VALUE
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# for the surface:
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/opnovice2/surfaceProperty NAME EN1 V1 EN2 V2 [ .. ENn Vn]
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Multiple energy and value pairs may be specified for the energy-dependent
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properties.
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Values are in Geant4 internal units. Energy is in MeV.
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Example:
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/opnovice2/boxProperty RINDEX 0.000002 1.3 0.000005 1.32 0.000008 1.34
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sets the refractive index of the box to 1.3 at 2 eV, 1.32 at 5 eV, and
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1.34 at 8 eV.
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2- PHYSICS LIST
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The FTFP_BERT physics list is used, with electromagnetic option
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EMZ (option4) and G4OpticalPhysics for the optical physics.
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3- AN EVENT : THE PRIMARY GENERATOR
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The primary kinematic consists of a single particle. The type of
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the particle, its energy, position, and direction, are set
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in the PrimaryGeneratorAction class, and can be changed via the G4
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build-in commands of G4ParticleGun class (see the macros provided with
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this example).
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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. To get visualisation:
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> /control/execute vis.mac
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or run the program with no command line arguments:
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$ ./OpNovice2
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5- HOW TO START ?
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- Execute OpNovice2 in 'batch' mode from macro files
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% OpNovice2 electron.mac
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- Execute OpNovice2 in 'interactive mode' with visualization
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% OpNovice2
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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- RESULTS
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A table of optical photon events is printed at the end of the run.
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7- HISTOGRAMS
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OpNovice2 has several predefined 1D histograms :
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1 : Cerenkov spectrum
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2 : scintillation spectrum
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3 : scintillation time (global time)
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4 : WLS absorption spectrum
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5 : WLS emission spectrum
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6 : WLS emission time
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7 : WLS2 absorption spectrum
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8 : WLS2 emission spectrum
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9 : WLS2 emission time
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10 : boundary process status
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11 : X momentum dir of scattered photons with px < 0
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12 : Y momentum dir of scattered photons with px < 0
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13 : Z momentum dir of scattered photons with px < 0
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14 : X momentum dir of scattered photons with px >= 0
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15 : Y momentum dir of scattered photons with px >= 0
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16 : Z momentum dir of scattered photons with px >= 0
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17 : X momentum dir of Fresnel-refracted photons
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18 : Y momentum dir of Fresnel-refracted photons
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19 : Z momentum dir of Fresnel-refracted photons
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20 : fraction of photons transmitted at surface
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21 : fraction of photons reflected at surface
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Histograms 11-19 are recorded for photons scattered from the +X
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surface of the cube. Only the first interaction is recorded.
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The histograms are managed by G4Analysis classes.
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The histos can be individually activated with the command:
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/analysis/h1/set id nbBins valMin valMax
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The unit is hardcoded to be eV for energy and ns for time.
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One can control the name of the histograms file with the command:
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/analysis/setFileName name (default opnovice2)
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It is possible to choose the format of the histogram file : root (default),
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hbook, xml, csv, by using namespace in HistoManager.hh
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It is also possible to print selected histograms on an ascii file:
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/analysis/h1/setAscii id
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All selected histos will be written on a file name.ascii (default opnovice2)
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8- MACROS
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Several macros are included.
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boundary.mac: Set the surface to the various types and configurations of
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model, type, etc., shoot optical photons, and record statistics
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electron.mac: Shoot electrons and observe Cerenkov and scintillation radiation
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fresnel.mac: Shoot optical photons of fixed polarization and random direction
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at a surface, and plot reflectance/transmittance vs incident
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angle.
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OpNovice2.mac: Shoot an optical photon inside a box.
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scint_by_particle.mac: Configure scintillation to have particle-specific
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yields and yield ratios. Shoot different types of particles.
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vis.mac: Configure visualization.
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wls.mac: Configure two wavelength-shifting processes, and shoot optical
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photons.
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