ATLAS experiment, designed to probe the interactions of particles emerging out of proton proton collisions at energies of up to 14 TeV, will assume operation at the Large Hadron Collider (LHC) at CERN in 2007. This paper discusses the assembly and the quality control tests of forward detector modules for the ATLAS silicon microstrip detector assembled at the Instituto de Fisica Corpuscular (IFIC) in Valencia. The construction and testing procedures are outlined and the laboratory equipment is briefly described. Emphasis is given on the module quality achieved in terms of mechanical and electrical stability.

ATLAS silicon module assembly and qualification tests at IFIC Valencia

The SemiConductor Tracker (SCT) is part of the Inner Detector of the ATLAS experiment at the LHC It is located between the Pixel detector and the Transition Radiation Tracker (TRT) During 2006 and 2007, the SCT was installed in its final position inside the ATLAS detector The SCT barrel was lowered in 2006 and was tested for connectivity and noise Common tests with the TRT to look for pick-up noise and grounding issues were also performed The SCT end-caps were installed during summer 2007 and will undergo similar checks The results from the various tests done before and after installation will be presented here

Semiconductor tracker final integration and commissioning in the ATLAS detector

Le demarrage de l'experience ATLAS aupres du LHC au CERN est prevu pour l'annee 2007. Le programme de physique de l'experience couvre un domaine vaste allant du Modele Standard (mise en evidence du boson de Higgs) jusqu'au dela avec les nouvelles theories (supersymetrie, dimensions supplementaires ....etc). Le travail presente dans cette these rentre dans le cadre de preparation au demarrage de cette experience. Apres avoir presente le run combine de 2004, ses installations et les analyses des donnees de calibration et des piedestaux du calorimetre electromagnetique, nous developpons une methode d'etalonnage de l'energie des electrons dans le calorimetre electromagnetique basee totalement sur les donnees de la simulation GEANT4 du run combine. Nous exposons ensuite l'etude des performances du calorimetre electrom\-agnetique ainsi que les resultats obtenus: un terme d'echantillonnage de la resolution en energie de 10.6$\%$ GeV$^{0.5}$ et un terme constant local de 0.43$\%$, une non-uniformite de reponse de 0.44$\%$ donnant un terme constant global de 0.6$\%$ et une linearite en fonction de l'energie meilleure que 0.2$\%$ pour des energies d'electrons entre 20 et 250 GeV. Cote simulation de "physique" de cette these, nous montrons une premiere etude sur la determination de l'angle effectif de melange $\sin^{2}\theta^{lept}_{eff}$ avec une precision meilleure que les resultats actuels, 10$^{-4}$. Pour atteindre une telle precision il va falloir identifier les electrons dans les regions vers l'avant du detecteur. Ce point fait l'objet de la derniere partie de ce manuscrit, il montre qu'on peut atteindre un taux de rejet electron-jet de 100 avec une efficacite de reconstruction des electrons de 50$\%$, en utilisant une analyse discriminante basee sur les methodes de Fisher, le maximum de vraisemblance et les reseaux de neurones.

Etude des performances du calorimètre électromagnétique tonneau d'ATLAS. Mesure de l'asymétrie avant-arrière dans les événements $q\bar{q}\rightarrow Z/\gamma^* \rightarrow e^+e^-$

ATLAS experiment, designed to probe the interactions of particles emerging out of proton proton collisions at energies of up to 14 TeV, will assume operation at the Large Hadron Collider (LHC) at CERN in 2007. This paper discusses the assembly and the quality control tests of forward detector modules for the ATLAS silicon microstrip detector assembled at the Instituto de F?sica Corpuscular (IFIC) in Valencia. The construction and testing procedures are outlined and the laboratory equipment is briefly described. Emphasis is given on the module quality achieved in terms of mechanical and electrical stability.

/pdf/atlas-silicon-module-assembly-and-qualification-tests-at-3z3aulre1q.pdf

The silicon tracker (SCT) is part of the inner detector at the ATLAS experiment at CERN. Its basic building blocks are 5 different types of silicon strip modules. In total more than 15000 p-on-n single-sided silicon strip sensors of an area of about 61 m2 were used to produce 4088 SCT modules. An overall module production yield of 92% could be achieved, where the silicon modules comply with the tight electrical, thermal and mechanical specifications. The macro-assembly of 2112 barrel modules to the four barrel support cylinders was successfully carried out. The nine disks of one endcap are fully populated with 988 modules, and for the second endcap more than 50% of the modules are already mounted. Test results operating complete barrels will be presented as well as a description of the test setup. The different integration steps of the SCT with the surrounding transition radiation tracker (TRT) will be explained. The installation of SCT and TRT into the ATLAS pit will happen during 2006

/pdf/tests-and-final-integration-of-the-atlas-semiconductor-4quqf1h8pf.pdf

B. Mikulec

Papers

Tests and final integration of the ATLAS semiconductor tracker