Import Geant4 4.1.0 source tree
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Gabriele Cosmo
@@ -1,6 +1,25 @@
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------------------------------Advanced Example--------------------------------- README FILE
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NB: The documentation for this example is in the process of being updated.
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Please go to http://www.ge.infn.it/geant4/examples/ for the most up-to-date
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description, manual, design documentation and users requirement/traceability.
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JUNE 2002:
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The underground physics example has been updated since the December Geant4.0
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release to include: 1) Analysis, using AIDA 2.2 and tested against Anaphe 4.0
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2) Full lab geometry - important for neutron scattering
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3) Updated macros/messengers
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4) Correction of a few minor features
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The messengers can be seen from typing help within the UI.
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Additional file handling and time/energy cut messengers have been implemented.
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(1) and (2) are discussed more fully below
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Note: Due to the importation of data files during the initialisation stage of
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Geant4, load-time may be in excess of 5 minutes.
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UNDERGROUND PHYSICS
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An example of a underground dark matter experiment.
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@@ -17,11 +36,19 @@ future off-line analysis.
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Geometry:
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Experimental set-up:
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A "cavern" of dimensions 5m x 6m x 3m with concrete walls is defined
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as the World Volume. In the centre of the cavern a steel vacuum
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vessel containing liquid and gaseous xenon is placed. The internal
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construction of the vessel accurately reproduces an existing prototype
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Dark Matter detector which allows experimental comparison. The active
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G4double worldWidth = 470.0*cm + 2.*wallThick; // "x"
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G4double worldLength = 690.0*cm + 2.*wallThick; // "y"
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G4double worldHeight = 280.0*cm + 2.*wallThick; // "z"
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A "cavern" of dimensions 5.18m x 7.38m x 3.28m with concrete walls is defined
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as the World Volume. A laboratory geometry is incorporated included desks,
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cupboards, door and windows. For ease this is included in a separate ".icc"
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file which can be removed should the code seem cumbersome. In the centre of
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the cavern a steel vacuum vessel containing liquid and gaseous xenon is placed.
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The internal construction of the vessel accurately reproduces an existing
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prototype Dark Matter detector which allows experimental comparison. The active
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detector volume is defined by a series of metal rings, complemented by
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a cover mirror and a PMT immersed in the liquid. Two grids and a
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thermalising copper shield are also incorporated. The liquid/gas
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@@ -52,6 +79,7 @@ An ASCII file containing the following information:
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PmtTime, ns : average PMT hit time relative to LXeTime
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First hit : first particle to hit liquid xenon
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Flags : particles contributing to energy deposition
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Seeds : the initial seed values for given hit events
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Note:
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@@ -103,6 +131,12 @@ Macros:
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Gammas are not killed at the concrete wall. Event summery is written
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to file "hits.out".
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ambe_spectrum.mac
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Produces a spectrum of neutrons according to an approximation of a Am/Be
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neutron source. However, this uses the GPS and therefore will only work
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after compilation with the DMXENV_GPS_USE environment variable (see below)
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sourceAm241.mac
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Forces the decay of 241Am nuclei in the calibrator and tracks the
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resulting particles (237Np + alpha + gamma from 237Np
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@@ -123,8 +157,87 @@ G4LEDATA : points to low energy data base - G4EMLOW0.5
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G4LEVELGAMMADATA : points to PhotoEvaporation data
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NeutronHPCrossSections : points to neutron data files G4NDL3.5
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In addition if you require to use the full General Particle Source then the
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variable DMXENV_GPS_USE can be set. The DMX gun is still included in order to
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allow forward compatibility should the GPS change.
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ANALYSIS:
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In order to use the AIDA 2.2 compliant analysis set the environment variable
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G4ANALYSIS_USE before building. If a previous build exists a gmake clean has
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to be executed.
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export G4ANALYSIS_USE=1
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To link with anaphe, first execute the anaphe installation script:
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source anaphe
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then gmake
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The program should then produce hbook histogram files as well as interactively
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two summary pages from QPLOTTER - outputing with postscript summary1.ps and
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summary2.ps
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In addition a lizard python script is included for reference:
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start lizard:
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lizard
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exe("DMX.py")
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Subsequent runs will require source of anaphe_start.sh
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source anaphe_start.sh
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before executing DMX
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NB: When running the program the output histogram file has to be "new"
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therefore if it has the same name as an existing file the program will crash.
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See http://cern.ch/anaphe for more information about ANAPHE/Lizard
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AIDA 2.2 information is available at http://www.aida.org
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Using AIDA 2.2 interfaces three different analysis packages can be utilised:
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Java Analysis Studio (JAS)
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OpenScientist
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Anaphe/Lizard
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At cern instead of executing the anaphe script see below:
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[
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AT CERN the following has to be executed in order to pick-up anaphe:
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execute the following lines _before_ gmake,
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select the Anaphe version you want to use (4.0.1-sec for RH61 "old" compiler,
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4.0.1 for RH61, new compiler (gcc-2.95.2)):
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export PATH=$PATH:/afs/cern.ch/sw/lhcxx/specific/redhat61/egcs_1.1.2/4.0.1-sec/bin
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source /afs/cern.ch/sw/lhcxx/share/LHCXX/4.0.1-sec/install/sharedstart.sh
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(for the new compiler, use (sh derivates):
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export PATH=$PATH:/afs/cern.ch/sw/lhcxx/specific/redhat61/gcc-2.95.2/4.0.1/bin
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source /afs/cern.ch/sw/lhcxx/share/LHCXX/4.0.1/install/sharedstart.sh)
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or, for [t]csh fans (still "old" compiler):
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setenv PATH ${PATH}:/afs/cern.ch/sw/lhcxx/specific/redhat61/egcs_1.1.2/4.0.1-sec/bin
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source /afs/cern.ch/sw/lhcxx/share/LHCXX/4.0.1-sec/install/sharedstart.csh
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]
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SEEDS:
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The seeds of event hits are stored in the hit record file. These can be used
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to repeat events for visualisation, test crashes/idiosyncracies:
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/random/setDirectoryName ./seeds
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/random/resetEngineFrom currentEvent.rndm
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/random/saveThisEvent
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/random/setSavingFlag
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The file currentEvent.rndm should contain the two seeds which were outputed in
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the scintHit file.
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ERRORS:
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When running interactively the following error will be shown:
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@@ -170,5 +283,5 @@ config/sys/Linux-egcs.gmk to be altered so that CXX is set to kgcc
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Alex Howard, 29/11/01
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updated 18/06/02
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