Hans Gutbrod and SUBATECH
ECOLE DES MINES DE NANTES
DIRECTOR OF SUBATECH 1996-2001 Laboratoire de Physique Subatomique et des technologies associées Unité Mixte de Recherche Ecole des Mines de Nantes-IN2P3/CNRS-Université de Nantes Development of fondamental and applied research Increase of permanent staff from 50 to 82 persons Project of a new building Funding from Conseil Regional 6 M Euros for 2000-2006
Equipment of SUBATECH
DEVELOPMENT OF RADIOCHEMISTRY
Clean rooms and development of new detector technologies
ALICE France Spokesman
Alice France (IN2P3/CEA) Construction :~: 8 M V0 SSD EMCal Tracking Trigger
Project Leader of Dimuon Spectrometer 2 périodes Eventde Display «commissioning montrant un» : des Déc. premiers 07 (2 semaines) muons détecté et Fév-Mars dans le 08 (4 semaines) spectromètre d ALICE (déclencheur = trigger muon) Intégration dans la partition générale ALICE : DCS, DaQ, Trigger, HLT Détection des premiers muons cosmiques muon trigger opérationnel déclenchement sur des cosmiques quasi-horizontaux muon tracking : stations 1 et 2 opérationnelles acquisition, calibration, transfert des données sur la grille, analyse, reconstruction V0-C opérationnel A finaliser avant le prochain commissioning (Mai 2008) et les premiers faisceaux du LHC (été 2008) Montage Alignement du muon trigger (~1 mois) ST4 Installation (~2 mois) et mise en fonctionnement des stations de tracking 3-4 5 (CERN) Installation et mise en fonctionnement du système GMS (Geometry Monitoring) Station 1 Electronique du V0-C (nouvelle version) Station 1 Station 4 et 5
Alice France (IN2P3/CEA) today Laboratories : 7 DSM/CEA, Saclay IPHC, Strasbourg IPN, Lyon IPN, Orsay LPC, Clermont LPSC, Grenoble Subatech, Nantes Responsibilities : French coordinator in 3 PWG over 4 (soft physics, high pt and photons, heavy flavors and quarkonia) One French representative at the MB (computing board)
The adventures of SSD
The Silicon Strip Detector in STAR: performance and physics results STAR SUBATECH group
Silicon Strip Detector
SSD Ladder
Detection module Silicon Wafer TAB Hybrid Circuit
Le ruban TAB Les avantages de cette technologie : Manipulation aisée du chip, Test possible en conditions réalistes Ruban flexible permettant une connexion en 3D Adaptation de pas Standard industriel
Detection module
Installation of SSD in STAR
Data samples taken with SSD/SVT 2005 run Cu+Cu 62 and 200 GeV 2007 run Au+Au 200 GeV SSD calibration of all data with the SSD finished in 2007 1 Thesis SUBATECH + 2 masters (GDRE Warsaw) Reconstruction of Cu+Cu data available from 2007. Reconstruction of Au+Au data available from oct 2008.
Estimate of spatial resolution of SSD and SVT from hit pull analysis The quality of calibration/alignment procedure for Run V (Cu+Cu) has been estimated from hit pull analysis in track fit. The spatial resolution has been estimated by the requirement to have pull standard deviation equal to 1, and is: SVT: σ(ρφ) = 49±5 μm σz = 30±7 μm. (design value σ(ρφ) = 20 μm) (design value σz = 20 μm) SSD resolution: σ(ρφ) = 30 μm (set to design value since << Mult.Coulomb Scatt.) σz = 742 ± 41 μm. (design value σz = 860 μm). The measured resolution of SSD meet the design values
Improvement in the Signal/Background ratio for strange particles TPC only TPC + 1 hit in SSD for both doughters of the Λ
Physics with the SSD: Motivation to measure e-d0 correlations - Suppress significantly (factor 100) the background of the D0 inv. Mass - Measure both c/b at same time Beauty Charm
Unlike Sign e-k Pythia simulation Like Sign e-k Separate c/b contributions, through e-k relative sign selection and angular correlation Δφ(e, D0)
Improvement in S/B ratio using the SSD for charm First results of applying the e-d0 correlation method to heavy ions : Cu+Cu 200 GeV, events required to have a high pt electron, D0 K π TPC only: S/sqrt(B)=2.89 TPC and SSD: S/sqrt(B)=3.79 STAR preliminary M(Kpi) (GeV) M(Kpi) (GeV) Improvement by ~30% in the S/B ratio for the D0 Kpi when using the SSD. No improvement when demanding also the SVT (not shown)
Conclusions and plans The SSD has been successfully used in STAR since 2005. Full calibration of all data with SSD has been achieved (2007). Reconstructed data with SSD/SVT are available since 2007 (Cu+Cu), and since oct 2008 (Au+Au). The excellent resolution of SSD of σ(ρφ) <= 30 μm, σz = 742 +-41 μm measured in the data, meets its design values. The invariant mass resolution of strange particles is improved by up to factor of 2 at high pt. Physics results with the SSD : the S/B of strange particles and charm (D0 meson), is improved by factors 1.3 to 3, when the SSD is used. allowed the first study of e-d0 correlations in HI collisions with STAR Future plans: Improve the low overall efficiency of SSD (noise, new peak finding software). SSD upgrade, and its inclusion in the future Heavy Flavour Tracker in run 2011.
Future of SSD
Cyclotron ARRONAX nuclear medicine and radiochemistry
QM2002