TileCal Status report (ATLAS-Pisa). Detector status Pisa activities Analysis Laboratory tests. TileCal Installation. Barrel at interaction point. EBC. EBA. The three TileCal cylinders are fully installed in the ATLAS cavern. Barrel: finished December 2004
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TileCal Status report(ATLAS-Pisa)
Barrel at interaction point
The three TileCal cylinders are fully installed in the ATLAS cavern
23 March:First 18 modules lowered
20 April: LAr cryostat lowered
24 May: EBA finished (Done in 8.5 weeks!)
Minimum bias trigger scintillators (8)
Cryostat (crack) scintillators (64)
Gap scintillators (64)
UX15 level 0
ROD commissioning in progress: already used for combined cosmic runs
E. Feng, S. Rosati,
and many more in the
Tile and Muon groups
R. Teuscher and
many more in the
Tile and LAr groups
We are well represented in all these activities.
Iacopo Vivarelli tile performance (test commiss.)
Chiara Roda co-convener of JetEtMiss group
Andrea Dotti online monitoring (presenter)
Nino Del Prete TileCal IB chair
Other activities in Pisa
Physics studies: VBF Higgs : Httbar
Top quark physics
Low energy pions in CTB
Laboratory measurements: (PMT/Fibres response stability)
(M. Canneri, V. Cavasinni, F. Sarri, I. Vivarelli)
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
(μat the same η of the run and off axis).
Electrons are easy to separate.
ALL sub-detector are exploited for the muon selection
LE Muon identification in TileCal (likelihood)
(Pi(E) energy distr. in Tile layer i)
The shape of L allows a rejection of muons.
MC do not quite reproduce data
Tile channel 18
η = 0.35
φ = 0
Tile channel 14
η = 0.15
φ = 0
Francesca Sarri, Giulio Usai
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=1034 cm-2s-1.
Led light yield monitored by two photodiodes.
Surprisingly the gain of all PMT increased with time at a rate ofabout 0.5-0.7 % per month.
No instrumental effect was found. Moreover the precise Cs calibration in different CTB periods confirms the effect also quantitatively.
In 2007 we will follow up this effect.
Composizione del gruppo ATLAS-Pisa
MI: metabolismo: 1 kE*FTE = 7.6 kE
Riunioni Tier2 (2 sett), Monitor (3 sett)
Workshops (ATLAS/CMS ed ATLAS) (8 sett) = 13 Sett
TOTALE 7.6 kE+...
ME: metabolismo: 1.5 mu*FTE = 11.4 mu
4 coordinamenti = 4 mu
A. Dotti, Monitor e DAQ per TileCal,
I. Vivarelli, Online-Daq e commissioning (WP4)
C. Roda, co-cordinatriced del gruppo JetEtMiss
N. Del Prete, Chair dell’ Institute Board di TileCal
tecnici (7 mu) (cablatura, riparazioni...)
fisici (16 mu): due fisici devono essere permanenti al CERN
durante il 2007 per la messa a punto dell’apparato.
TOTALE 38 mu
HVBF(120 GeV) tt hhnn
V.Cavasinni, F.Sarri, I. Vivarelli
VBF H = 300 fb
BR (tau hadrons) : 65% ; BR(tthh) : 42.25 %
Signal signature :
- 2 high pt forward jets ,
- 2 central tau jet ,
4 jets& ETmiss
Backgrounds: QCD (~9 mb), Z/*+jets (1700 pb) , ttbar (550 pb)
Crucial the tau identification: collaboration with Milano, Freiburg, Toronto
SUMMARY ATLFAST 30 fb-1
Validation with full simulation started
COMPARISON ON ETMISS AND NUMBER OF JETS
red : full AODs, black fast AODs.
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.
Similar good results using the same weghts obtained with
a Cone0.4, ttbar events, and CTB data
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.
Zone of inefficiency for muons by Tile
Only the bottom half
of the RPC (negative y)
is working in the runs
Energyε for μ off axisε for μ by likelihoodμ-contamination e-contamination
(GeV) (%) (%) |likelihood|<30 (%)[μ(1-εmulik)] /π(%) /π
9 92.4 ± 0.6 89.7 ± 1.015.0 0.6
7 85.8 ± 0.8 99.3 ± 0.1 2.7 0
5 94.0 ± 0.7 99.48 ± 0.0710.2 0.3
3 83.6 ± 2.2 99.83 ± 0.03 11.1 0.6
Efficiencies and contamination
Electrons are easily identified by beam Cerenkov.
Muons can be identified using L or by MDT etc.
Energy deposition in the calorimeters (log and lin scales)
MC : 3399±6
Total energy deposit. The correction on energy deposition at Cryo is included.
Energy Distributions for pions
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
Pions at 9 GeV
-Validate ATLFAST with full simulation
-New parametrization for tau-ID (with the Toronto Group)
red : full AODs, black fast AODs.
Same weights applied also to the ttbar events, Rome sample
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
Vassili Kazanine (Budker Institute Novosibirsk, a former (and future) FAI in Pisa)
Vnom:= Gain(Vnom) = 105
Gain(V) ~ Vb
Statusup to 2006
Almost 14 months
DVn/Vn = -.41±0.13 (3mnts estimate) (measured untill Jan’06)
Cs Calibration (at theCTB):
DVn/Vn = -.36±0.04 (3mnts)
Light source changed, because of LED and LED driver broken at the end of Jan’06.
mean : - 0.36 %
rms : 0.22 %
mean : 1.6 %
rms : 0.8 %
NomVol drop (%)
Average slope of 15 PMTs, NomVol drop estimate in 3 months
Average slope of 15 PMTs, PMT/PHD rise estimate in 3 months.
N. Del Prete, Francesca Sarri
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 6 10-4 sistematics under study
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.
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...
rms = 6 10-4