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Simulation in LHCb


Gauss is the LHCb Simulation software, built on the Gaudi Framework.
It consist of a first phase where the events are generated (e.g. pp collisions at 14 TeV) and a second phase where the particles are propagated trough the LHCb detectors.


The Gauss release manager is Gloria Corti. The list of topics and coordinators/contacts is here.

Gauss Web

The main Gauss web page containing release information and links to user guides and tutorials, is here.



Gauss Tutorial

There are 3 tutorials for self-teaching. See here.

Gauss User Guide

Ongoing tasks/projects, open issues

Gloria's talk on 20th June 2008 (33rd software week)
Gloria's talk on 30th June 2008 (TRec meeting)
Patrick's talk on 2nd July 2008 (Flavour Physics meeting

Survey geometry for simulation

Last update: 4th July 2008

It is agreed that, ultimately, the 2008 simulation should simulate a realistic detector based on the surveyed detector, not the ideal ("Optimisation TDR") detector simulated in DC06
See here for the various issues


Detector DDDB tag SIMCOND/LHCBCOND tag Contents and Comments Responsible
VELO       David/Marco
TT     Ideal final geometry in DDDB, Survey cannot be used, overlaps ok for LHCb and G4 Jeroen/Cristophe
IT     Ideal geometry in DDDB, still some issues: shift of 2.5mm to be solved, Survey cannot be used, overlaps ok for LHCb, to be checked for g4 Vincent/Matt
OT     Restructuring with multiple LV for stations and layers, overlaps ok in LHCb (jan), to do for G4 Jan
RICH     Still small work, ideal and survey Sajan/Antonis
Calorimeters     calo split, converter to be slipt still, to check with real position for plugs and z, overlaps ok in LHCb. to be done in G4 Vladimir/Olivier D.
Muon     survey of chamber to bein DDDB, half stations final positions in SIMCOND, M1 open to be in DDDB(all chambers there), off in SIMCOND Simone/Alessia
BCM head-20080603 not used Ideal in DDDB, cables? Magnus
Magnet and Beam Pipe     To do as installed in DDDB: Bakeout in RICH removed, collars in magnet, bellow in VELO window, and clear overlaps. Daria/Gloria
RMS     togheter with IT2 already in Kiev(/Vincent/Matt)

Conditions for simulation

Last update: 4th July 2008

The simulation (and reconstruction of simulated data) will get a copy of the necessary online conditions from a SIMCOND database.
See here for the various issues
Marco Cl. is going to provide a first version of SIMCOND containing the existing ONLINE data structure, and the conditions included in the latest LHCBCOND tag. There will also be a version with all misalignements set to zeros
CondDB release notes

Next versions

  • v33r2, see in the entry in LHCb Tag collectors
  • v34r0, see in the entry in LHCb Tag

-- GloriaCorti - 04 Jul 2008

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Topic revision: r4 - 2008-07-04 - GloriaCorti
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