Presentation on theme: "Roma 16 maggio 2006 Commissione I Detector status Pisa commitments Analysis Laboratory tests TileCal Status report (ATLAS-Pisa)"— Presentation transcript:
Roma 16 maggio 2006 Commissione I Detector status Pisa commitments Analysis Laboratory tests TileCal Status report (ATLAS-Pisa)
Roma 16 maggio 2006 Commissione I TileCal installation Barrel installed (end Oct. 2005) and instrumented, commissioning in progress. EBC installed, in place (1 Feb. 2006), being instrumented, gap scintillator installed. EBA being installed, Lar cylinder in place, will be ready for commissioning end May.
Roma 16 maggio 2006 Commissione I Barrel (1) Barrel is cabled All the FE electronics has been mounted and is working DAQ is moving smoothly from the portable (MOBIDAQ) to the final one (RODs) First Cosmic Ray data has been taken with MDT using a limited azimuthal region (power supply/cooling problem)
Roma 16 maggio 2006 Commissione I An event MDT/Tile
Roma 16 maggio 2006 Commissione I Barrel (2) Still some problems are delaying the barrel commissioning: –Cooling pipes just arrived –LVPS have been fixed but However the system has not been extensively tested. We are aware that other faults could show up. –HV trips on drawers (7% of drawers have occasional trips) have been understood (humidity+dust), a working solution has been proposed (slowly blow dry air). Still investigating the origin of the problem.
Roma 16 maggio 2006 Commissione I EBC almost in place
Roma 16 maggio 2006 Commissione I EBC + EBA EBC installation completed (1/2/06) –Geometry within tolerances. –Commissioning is proceeding (control and trigger cables, piping…) –Moved “near” the Barrel. Tile/Lar relative position are off by 12mm in z wrt nominal. Impact on B-field have been analysed. Decision was made to position EBC as near to barrel as possible. EBA in nominal position –EBA is being assembled in the pit. On schedule, expected ready by end May 2006.
Roma 16 maggio 2006 Commissione I EBC being completed
Roma 16 maggio 2006 Commissione I EBC almost in place
Roma 16 maggio 2006 Commissione I EBA being installed
Roma 16 maggio 2006 Commissione I Pisa responsibilities We are well represented in all this activities. Iacopo Vivarelli online tools (tests on commiss.) Chiara Roda co-convener of JetEtMiss group Anna Lupi TileCal software Andrea Dotti online monitoring (presenter) Nino Del Prete TileCal IB chair
Roma 16 maggio 2006 Commissione I Activities at CERN (2006) 1. trigger cabling LB (July-August) (techs) 2. Test all LB (LVPS, HV tests, FE) (Jan-Dec) (Iacopo, Francesca, Maria) 3. Barrel timing with laser (Sept./Nov) (Iacopo, Paolo) 4. DAQ/Monitor (Aug./Dec). (Chiara, Andrea) 5. Cosmics Run (standalone, with MDT and/or Lar) fall 2006 (all) 6. Installation/commisioning EBC, EBA (The same amount of work as for LB) (know how from LB)
Roma 16 maggio 2006 Commissione I Other activities in Pisa Physics studies: VBF Higgs : H bar Jet calibration Comparison G4/CTB Low energy pions in CTB Laboratory measurements: (PMT/Fibres) synergy with the Computer Science Dpt of Univ Pisa
Roma 16 maggio 2006 Commissione I hh E T miss H VBF (120 GeV) hh BR (tau hadrons) : 65% ; BR( hh) : % VBF H = 300 fb Signal signature : - 2 high pt forward jets, - 2 central tau jet, - E T miss 4 jets & E T miss Backgrounds: QCD (~9 mb), Z/ * +jets (1700 pb), ttbar (550 pb) Crucial the tau identification: collaboration with Milano, Freiburg, Toronto V.Cavasinni, F.Sarri, I. Vivarelli
Roma 16 maggio 2006 Commissione I CutSignal efficiency Events QCD efficiency Events Z+jets efficiency Events Ttbar efficiency Events 4jet (2 tau), E t miss > 45 GeV 4.4% Pt tau (45,35)1.14% Pt forward (60,40) 0.72% forward0.37% Cuts0.25% M jj (700 GeV)0.22% Jet veto (30 GeV) 0.2% Mass window0.15% SUMMARY ATLFAST 30 fb -1 In progress Validation with full simulation started
Roma 16 maggio 2006 Commissione I Jet calibration The H1 method : jet energy is the sum of weighted cell energy. QCD 2 jets events has been used to compute weights using “topoclusters” and cone algorithm (R=0.7). The method/weights prooved to be good also for calibrating jets with different cones (R=0.4) and different samples (t-tbar) and seems to work well also for CTB data. This algorithm is robust and stable and is implemented in ATHENA.
Roma 16 maggio 2006 Commissione I Similar good results using the same weghts obtained with a Cone0.4, ttbar events, and CTB data
Roma 16 maggio 2006 Commissione I Very Low Energy CTB CTB has collected data at low energy (3-9 Gev/c) It is important to measure the calorimeters response to a low energy pion (a jet = many low energy pions) It is difficult for many experimental problems: particle identification (e, pion, mu) the beam has a parasitic high energy muon component energy calibration is still not properly understood The work is still in progress. (M. Canneri, V. Cavasinni, F. Sarri, I. Vivarelli)
Roma 16 maggio 2006 Commissione I CTB set up for VLE Our aim: obtain the purest pion sample from VLE data. The VLE beam is made of electrons, pions and muons (μ at the same η of the run and off axis). Electrons are easy to separate. ALL sub-detector are exploited for the muon selection MDT/RPC
Roma 16 maggio 2006 Commissione I LE Muon identification in TileCal (likelihood) (P i (E) energy distr. in Tile layer i) MC DATA Pions The shape of L allows a rejection of muons. MC do not quite reproduce data (more later).
Roma 16 maggio 2006 Commissione I Energy ε for μ off axis ε for μ by likelihood μ-contamination e-contamination (GeV) (%) (%) |likelihood|<30 (%) [μ (1-ε mu lik )] /π (%) /π ± ± ± ± ± ± ± ± Efficiencies and contamination Electrons are easily identified by beam Cerenkov. Muons can be identified using L or by MDT etc. In progress
Roma 16 maggio 2006 Commissione I A CTB “TAU jet” 3 pion of 7 GeV superimposed in LaR TILE
Roma 16 maggio 2006 Commissione I Test beam data, Energy deposit: G4 vs EXP, muons (1), the em scale (V.Kazanine) MOP value EXP: 3340±60 MC : 3399±6 Energy deposition in the calorimeters (log and lin scales) Lar+Tile
Roma 16 maggio 2006 Commissione I Energy deposit: G4 vs EXP, pions (1) All cells in TileCal are used while in LAr only the cells within ±0.2 eta and ±0.2 phi LAr window (eta = 0.25, phi = 0) are used; The cut on the energy at cells is E cell > 2 sigma noise; Energy deposition in the calorimeter is the sum over selected cells; The energy deposition at Cryo is approximated as : Total energy deposit. The correction on energy deposition at Cryo is included. Lar+Tile
Roma 16 maggio 2006 Commissione I Francesca Sarri, Giulio Usai PMTs STABILITY We have measured in our lab the gain, QE, noise etc of 24 PMT (the same used in TileCal), illuminated with continuous light simulating LHC at L=10 34 cm -2 s -1. Led light yield monitored by two photodiodes. Surprisingly the gain of all PMT increased with time at a rate of about % per month. No instrumental effect was found. Moreover the precise Cs calibration in different CTB periods confirms the effect also quantitatively
Roma 16 maggio 2006 Commissione I Almost 14 months (April05-May06) V nom := Gain(V nom ) = 10 5 Gain(V) ~ V Light source changed, because of LED and LED driver broken at the end of Jan’06. Status up to 2006 Labo: Vn/Vn = -.41±0.13 (3mnts estimate) (measured untill Jan’06) Cs Calibration (at theCTB): Vn/Vn = -.36±0.04 (3mnts)
Roma 16 maggio 2006 Commissione I Summary: NOV’05-JAN’06 Average slope of 15 PMTs, NomVol drop estimate in 3 months Average slope of 15 PMTs, PMT/PHD rise estimate in 3 months. mean : % rms : 0.22 % mean : 1.6 % rms : 0.8 % NomVol drop (%) PMT/PhD (%)
Roma 16 maggio 2006 Commissione I The curved fibre ageing 50 cm N. Del Prete, Francesca Sarri
Roma 16 maggio 2006 Commissione I Fibre ageing Step motor Shutter PMT At each step, the PMT current is measured. Then the wheel is positioned in the different locations for more precise measurements. The precision in the ratio Fibra1/Fibra2 is about sistematics under study
Roma 16 maggio 2006 Commissione I Backup slides
Roma 16 maggio 2006 Commissione I Monitor and Presenter Presentations on the progress of the monitoring working group presented at CHEP06 by A.Dotti and W.Vandelli.
Roma 16 maggio 2006 Commissione I RPC We use the RPC in order to try to understand the fake by MDT on electron events (many events have more than 13 hits in MDT). They could be muons that are outside Tile calorimeter acceptance. RPC
Roma 16 maggio 2006 Commissione I RPC geometry Zone of inefficiency for muons by Tile Only the bottom half of the RPC (negative y) is working in the runs
Roma 16 maggio 2006 Commissione I Pions : sADC_Cherenkov2<620 && N hits in TRT <4 && not μ (mouns: signal in MDT or MuonWall or MuonTag) E Tile in the cone 0.19< η <0.61, all φ; E Lar in the cone 0.19 < η <0.61, -0.1< φ < 0.1 Energy Distributions for pions Pions at 9 GeV
Roma 16 maggio 2006 Commissione I red : full AODs, black fast AODs. In progress: -Validate ATLFAST with full simulation -New parametrization for tau-ID (with the Toronto Group) QCDSIGNAL
Roma 16 maggio 2006 Commissione I Same weights applied also to the ttbar events, Rome sample
Roma 16 maggio 2006 Commissione I The same weights (determined in QCD MC events) work well for different cone definitions, for different samples and also (preliminary) on Combined Test Beam data. This method seems more robust than the “standard” ATLAS jet calibration
Roma 16 maggio 2006 Commissione I First steps on CTB comparison: G4 vs EXP Vassili Kazanine (Budker Institute Novosibirsk, a former (and future) FAI in Pisa) The simulation of calorimeters in G4 has been the subject of previous studies (Anna, Andrea) using TileCal standalone (TB vs G4). Now G4 simulation of CTB is available and Vassili has taken up the issue of comparing data and MC. The energy scale seems to be under control and the total energy deposition in Tile+Lar is well reproduced, but: the energy in Lar is predicted too large and in tile too small once more we have the problem of the longitudinal shower shape not correctly predicted by G4.
Roma 16 maggio 2006 Commissione I Richieste: ME Stato delle spese ad oggi: ME: assegnato 109 k€ speso ad oggi 55K€ (51%) manca ancora il contributo tecnici per commissioning (7 mu) E’ richiesta la presenza continua al CERN di Vivarelli e Dotti. Questo non e’ compatibile col finanziamento attuale. Abbiamo richiesto una integrazione di 6 mu per arrivare a fine anno.
Roma 16 maggio 2006 Commissione I DAQ A new, friendly, DAQ system was built using a CAEN Brigde (V1792) which interface VME to a PC where the DAQ system runs through ROOT. A student (Marco Raglianti) from the Computer Science Department has designed this nice and simple system as part of his “tesi di tirocinio”. The Bridge has become a powerful development system. C++ programs can be fully tested, in ROOT, and then compiled and run on single board PC in VME. What is missing are VME units (ADC etc.): we use old CAMAC units that we have interfaced to VME. Often these units are faulty...
Roma 16 maggio 2006 Commissione I Preliminary. The precision of the method is OK. The problem is the mechanical stability (LED position, optical couplings etc.). Time (h) rms =