This page is obsolete and no longer maintained.

The new address for the Gauss web site is:

http://cern.ch/LHCb-release-area/DOC/gauss/

Gauss is the new simulation program of the LHCb experiment.  It is based as all the other experiment applications on the Gaudi framework.

Foreseen meetings

• Geant4 TSB minutes (8 October 2004)
• Geant4 workshop (4-9 Oct 2004 in Catania)
• Geant4 Technical Forum in Catania: LHCb input
• Geant4 TSB (18 March 2003 at CERN)
• Geant4 user workshop (11-15 Nov 2002 at CERN)
• Geant4 workshop (30 Sept-4 Oct 2002 at CERN)
• Geant4 Delta review (9-11 Oct 2002 at CERN)

Structure

Gauss is organized as a CMT application project. The primary interactions can be generated by several Generators, the tracking is performed by the Geant4 toolkit, It uses the EvtGen package for B decays

CVS repository : GaussEnv, GaussSys, Sim, Gen

DC06 version v25r6 :
uses pythia 6.325.2 from GENSER_1_4_1, GEANT4 v71r0p15 (patched version of geant4.7.1), Gaudi v18r10, LHCb v21r11, XmlDDDB v30r13, XmlConditions v2r4, FieldMap v4r7, DecFiles v13r1, ParamFiles v4r5
Doxygen code documentation,  release notes,  requirements, statistics

• standard use
  • > source <somewhere>/Sim/Gauss/v25r6/cmt/setup.csh
  • > gmake
  • > $GAUSSROOT/$CMTCONFIG/Gauss.exe $GAUSSOPTS/v200601.opts
• to use Herwig
  • > source <somewhere>/Sim/Gauss/v25r6/cmt/setup.csh -tag_add=Herwig
  • > gmake CMTEXTRATAGS=Herwig
  • > $GAUSSROOT/$CMTCONFIG/GaussHerwig.exe $GAUSSOPTS/v200601.opts
  • Note that you need to activate Herwing in the options (see example in Gauss.opts)
• to use BcVegPy or Hijing it is the same procedure as for Herwig, where BcVegPy or Hijing replace Herwig in the example above
• to use the Geant4 visualization and UI internally in Gauss:
  • > source <somewhere>/Sim/Gauss/v25r6/cmt/setup.csh -tag_add=Vis
  • > $GAUSSROOT/$CMTCONFIG/Gauss.exe $GAUSSOPTS/GaussVis.opts

Documentation: Gauss User Guide and Reference Manual (pdf )

Development

Gauss v30r1 uses new Geant4 8.1  is built on $LHCBNEW with CMT v1r18p20060606 : to use it

Next version(s) and planning

Latest DC04 Production version v15r22

uses  Gaudi v15r7, LHCb v16r6,  Geant4 v61r0, Geant4Files v52r0, ParamFiles >=v3r12, FieldMap v4r5, XmlDDDB= v22r2, DecFiles>=v11r4 (< v12r0), DC04 settings
Doxygen code documentation, release notes, requirements

Reporting bugs
You can report bugs or view bug histories via the Gauss Savannah portal

Event Generators

Nick Brook slides presented on 14/1/02 

some useful links: StdHepC++
                           HepMc under Gaudi (work done by ATLAS)
                           Physics event data model
                           Geant4 cuts per region proposal
                           Geant4 User requirements 6.4 (pdf)(20.09.02)
                           Geant4 Physics Lists

Detector Geometry

Documentation is available here, including guidelines for checking overlapping volumes.

How to use Visualization attributes for GaussVis  (document), (slides)

Sub-detector Simulation

Supported Versions 

Obsolete Versions: are archived on Castor

Planning

• Goals for 2004: DC04
  • redesign GiGa to manage MCParticle/MCvertex tree more easily - Nov 2004
• Goals for 2003: complete the application; be ready for a production test in Summer 2003.
  • GAUSS_v11rX job list
• Goals for 2002  (.mpp file). Here are the  latest list of milestones and pending tasks.

Documentation

General Information

• How to work with the Gauss project
• Integration of GEANT4 with GAUDI, by I. Belyaev, paper presented at  CHEP'01, Beijing, P.R. China, September 3-7, 2001 (pdf)

RICH Information

• Status of GEANT4 Cherenkov Studies, by Sajan Easo (ppt)

ECAL Information

Tracker Information

Talks

• GAUSS status report, by W.Pokorski, LHCb Week, September 2002 (ppt)

• GAUSS work plan , by F.Ranjard, LHCb Software Week, March 2002 (ppt)

• Simulation Program Roadmap, by F. Ranjard, LHCb Software Week, October 2001 (pdf)

• GAUSS - How to Start, by F. Ranjard, LHCb Software Week, June 2001 (pdf)

Relations with G4 team

• G4 foreseen meetings and related mails (memo 02.08.02 FR)

• Collaboration agreement (draft)

• G4 organisation diagram (draft)