Résumé du preprint DAPNIA-06-119

Software management for the alignment system of the ATLAS Muon Spectrometer
J.-C Barriere, F.Bauer, O. Cloué, B. Duboué, M. Fontaine, A. Formica, P.F. Giraud, V. Gautard, C. Guyot, P.Ponsot, Y. Reinert, A. Richardson, Ph. Schune
ATLAS is a particle detector which will be built at CERN (Geneva) at the Large Hadron Collider (LHC) 
accelerator. The ATLAS barrel muon spectrometer is made up of 600 chambers positioned in three 
layers embedded in a toroidal magnetic field. Thus each muon track is detected by three muon 
chambers within a projective tower performing a sagitta measurement. In order not to deteriorate 
the sagitta measurement, the muon chamber position must be known within a tower with a spatial 
resolution of 30m.  A short introduction on the alignment of the experiment is given in the first 
section, the second and third sections are respectively devoted to the PRAXIAL and REFERENCE 
alignment systems. In the fourth section, ASAP, the software package written to reconstruct 
the spatial position of the chamber in the muon spectrometer will be described. 


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