TileCal Status report (ATLAS-Pisa)
•Detector status
•Pisa activities
•Analysis
•Laboratory tests
Trieste 20 settembre 2006
Commissione I
TileCal Installation
Barrel at interaction point
EBC
EBA
The three TileCal cylinders are fully
installed in the ATLAS cavern
•
•
Barrel: finished December 2004
Extended Barrel C: finished February 2006
•
Extended Barrel A: finished May 2006
Trieste 20 settembre 2006
Commissione I
EBA installation
23 March: First 18 modules lowered
20 April:
LAr
cryostat
lowered
Trieste 20 settembre 2006
24 May: EBA finished
(Done in 8.5 weeks!)
Commissione I
Gap, crack, MBT scintillators
Minimum bias trigger
scintillators (8)
Cryostat (crack)
scintillators (64)
Gap scintillators
(64)
• Installation status: gap, cryostat, and minimum bias trigger
scintillators completely installed on both extended barrels
• Fiber cabling and light sealing finished, currently being
tested
Trieste 20 settembre 2006
Commissione I
Cesium system status
UX15 level 0
• Interconnection/piping of cesium tubes done for 3 cylinders
• Local equipment (garages, electronics boxes) installed for 3
cylinders
• September: install hydraulic system in UX15 racks
• October: connect to the drive, wet test using dummy source
• November: start calibrations in barrel using 137Cs source
Trieste 20 settembre 2006
Commissione I
Status of drawers
• Barrel: insertion and
certification finished
– Waiting for access to repair
1 drawer
• Extended barrel:
– Insertion finished
– Recertification ongoing
after transport to pit and
cylinder assembly
– So far 31/128 drawers
tested
– Waiting for access to repair
faults found
Trieste 20 settembre 2006
Commissione I
LVPS: Introduction
• Finger low voltage power supply
(fLVPS)
– Fits in finger
– 8 voltage outputs from 8 bricks
– Bricks controlled by PCB in box
called ELMB_MB
• Problems found after first attempts
at commissioning with LVPS
– Safety: damage to drawers caused
by overvoltage
– Noise: higher noise in integrator
and digital readouts associated with
power supplies
– DCS: LVPS control improving
• These problems have been studied
and solutions have been found
• Dealing with these problems has
severely impacted deployment and
commissioning
Trieste 20 settembre 2006
Commissione I
LVPS: Schedule
•
Boxes currently being installed are assembled
with bricks and ELMB_MB modified for safety
by hand
– ~50% already installed in barrel (not final version)
– 4 with final ELMB_MB ready for commissioning (1
week)
•
Final version of LVPS (guarantee
performance/stability) under test
Trieste 20 settembre 2006
Commissione I
ROD System
• Status of production:
– ROD Production COMPLETED: All 32 RODs needed
(8 per partition) already produced.
– 24 RODs + related boards (75% of the total) installed
in USA15 for LBA, LBC and EBC.
• Firmware upgraded to avoid busy signals in
case of front-end failures.
ROD commissioning in progress: already used for combined cosmic runs
Trieste 20 settembre 2006
Commissione I
E. Feng, S. Rosati,
S. Veneziano
and many more in the
Tile and Muon groups
 Combined
Tile+RPC+
MDT run
 August 14,
2006
R. Teuscher and
many more in the
Tile and LAr groups
 Combined
Tile+LAr run
 3 weeks ago
Pisa responsibilities
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
Trieste 20 settembre 2006
Commissione I
Activities at CERN (2006/2007)
in which we are directly involved
• trigger cabling LB (Sept-Dec) (techs)
• Test all LB (LVPS, HV tests, FE) (Jan-Dec 2007)
(Iacopo, Francesca, Maria)
• Barrel timing with laser (Sept./dec) (Iacopo, Paolo)
• DAQ/Monitor (Sept./Aug.). (Chiara, Andrea,Danilo)
• Cosmics Run (standalone, with MDT/RPC Lar)
fall 2006-2007 (all)
• Installation/commisioning EBC, EBA (The same amount
of work as for LB) (know how from LB)
• Make it work! (2006/2007) (all)
Trieste 20 settembre 2006
Commissione I
Other activities in Pisa
Physics studies: VBF Higgs : Httbar
Top quark physics
Jet calibration
Comparison G4/CTB
Low energy pions in CTB
Laboratory measurements:
(PMT/Fibres response stability)
Trieste 20 settembre 2006
Commissione I
A.Dotti
Trieste 20 settembre 2006
Commissione I
Very Low Energy CTB
(M. Canneri, V. Cavasinni, F. Sarri, I. Vivarelli)
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.
Trieste 20 settembre 2006
Commissione I
CTB set up for VLE
MDT/RPC
B ea m st o p
HE m uons
B C0
B C- 1
V L E p a r t icle s
Se c . t a r g e t
B C- 2
D ip o le m a g n e t s
M u o n H a lo
B C1
S1
Q u a d r u p o le m a g n e t s
B C2
S2/ 3
M u o n w a ll
ID
LAr
T ile
Cr y o s t a t s c in t .
M uon tag
CH R V 2, L E
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
Trieste 20 settembre 2006
Commissione I
LE Muon identification in TileCal
(likelihood)
L  P1 ( E1 )  P2 ( E2 )  P3 ( E3 )
(Pi(E) energy distr. in Tile layer i)
DATA
MC
Pions
Pions
The shape of L allows a rejection of muons.
MC do not quite reproduce data
Trieste 20 settembre 2006
Commissione I
Event selection – off axis muon ID with timining
• We want to identify off-axis
muons with an unbiased
calorimeter selection we
cannot use the position of the
energy deposits
• Hypothesis: the presence of the
off-axis muon is uncorrelated
with the trigger. Consequence:
the timing of the off-axis muon
should be randomly distributed
in the acquisition window.
• That is the case. Powerfull
way to reject the off-axis
muons
• An event is rejected if both the
channels of 1 cell have the
reconstructed time outside a 35
ns large window.
Tile
channel 18
η = 0.35
On-axis
event
φ=0
ns
Off-axis event
Tile
channel 14
η = 0.15
φ=0
ns
Trieste 20 settembre 2006
Commissione I
PMTs STABILITY
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 of about 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.
Trieste 20 settembre 2006
Commissione I
Backup slides
Trieste 20 settembre 2006
Commissione I
Composizione del gruppo ATLAS-Pisa
V.Cavasinni
D. Cimino
T. Del Prete
A. Dotti
V. Flaminio
A. Lupi
C. Roda
F. Sarri
I. Vivarelli
Totale
Trieste 20 settembre 2006
PO
Bors
INFN
Dott
PO
AR
RU
Dott
AR
0.8
0.8
1.
1.
0.2
1.
0.8
1.
1.
7.6 FTE
Commissione I
Richieste 2007
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
commissioning:
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
Trieste 20 settembre 2006
Commissione I
HVBF(120 GeV)  tt hhnn
V.Cavasinni, F.Sarri, I. Vivarelli
 VBF H tt = 300 fb
BR (tau  hadrons) : 65% ; BR(tthh) : 42.25 %
 sig   VBF  BR ( H  tt )  BR (tt  hh)  125 fb
Signal signature :
- 2 high pt forward jets ,
- 2 central tau jet ,
- ETmiss
th
4 jets & ETmiss
ET miss
Backgrounds: QCD (~9 mb), Z/*+jets (1700 pb) , ttbar (550 pb)
Crucial the tau identification: collaboration with Milano, Freiburg, Toronto
Trieste 20 settembre 2006
Commissione I
SUMMARY ATLFAST 30 fb-1
Cut
Signal
efficiency
Events
QCD
efficiency
Events
Z+jets
efficiency
Events
Ttbar
efficiency
Events
4.4%
3.4 10-8
4.6 10-3
7.3 10-4
Pt tau (45,35) 1.14%
2.3 10-11
5.8 10-4
1.1 10-4
Pt forward
(60,40)
0.72%
7.4 10-12
2.2 10-4
6.8 10-5
h forward
0.37%
4.7 10-13
1.3 10-5
2.4 10-6
t Cuts
0.25%
7.5 10-14
5.8 10-6
0.5 10-6
Mjj (700 GeV)
0.22%
5.8 10-14
5.0 10-6
4 10-7
Jet veto
(30 GeV)
0.2%
7.3
3.2 10-14
9
3.2 10-6
67
1.7 10-7
4.4
Mass window
0.15%
1.7 10-15
1.6 10-7
full simulation
0.55
3.3
4jet (2 tau),
Etmiss > 45
GeV
Validation
6 with
Trieste 20 settembre 2006
Commissione I
started
0
COMPARISON ON ETMISS AND NUMBER OF JETS
QCD
SIGNAL
red : full AODs, black fast AODs.
Trieste 20 settembre 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.
Trieste 20 settembre 2006
Commissione I
Similar good results using the same weghts obtained with
a Cone0.4, ttbar events, and CTB data
Trieste 20 settembre 2006
Commissione I
Monitor and Presenter
•Presentations on the progress
of the monitoring working group
presented at CHEP06 by
A.Dotti and W.Vandelli.
Trieste 20 settembre 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
Trieste 20 settembre 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
Trieste 20 settembre 2006
Commissione I
Efficiencies and contamination
Electrons are easily identified by beam Cerenkov.
Muons can be identified using L or by MDT etc.
Energy ε for μ off axis
(GeV)
(%)
9
92.4 ± 0.6
7
85.8 ± 0.8
5
94.0 ± 0.7
3
83.6 ± 2.2
Trieste 20 settembre 2006
ε for μ by likelihood
(%) |likelihood|<30
89.7 ± 1.0
99.3 ± 0.1
99.48 ± 0.07
99.83 ± 0.03
μ-contamination
(%) [μ (1-εmu lik)] /π
15.0
2.7
10.2
11.1
Commissione I
e-contamination
(%) /π
0.6
0
0.3
0.6
A CTB “TAU jet”
• 3 pion of 7 GeV superimposed in LaR TILE
Trieste 20 settembre 2006
Commissione I
Test beam data, Energy deposit: G4 vs
EXP, muons (1), the em scale
(V.Kazanine)
Lar+Tile
Lar+Tile
Energy deposition in the calorimeters (log and lin scales)
MOP value
EXP: 3340±60
MC : 3399±6
Trieste 20 settembre 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 Ecell > 2 sigma
noise;
• Energy deposition in the
calorimeter is the sum
over selected cells;
• The energy deposition at
Cryo is approximated as :
•
Lar+Tile
Total energy deposit. The correction on energy deposition at
Cryo is included.
Trieste 20 settembre 2006
Commissione I
1 . 47 E TileA E BackLAr
Energy Distributions for pions
Pions at 9 GeV
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
Trieste 20 settembre 2006
Commissione I
In progress:
-Validate ATLFAST with full simulation
-New parametrization for tau-ID (with the Toronto
Group)
QCD
SIGNAL
red : full AODs, black fast AODs.
Trieste 20 settembre 2006
Commissione I
Same weights applied also to the ttbar events, Rome sample
Trieste 20 settembre 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”
ATLASCommissione
jet calibration
Trieste 20 settembre 2006
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.
Trieste 20 settembre 2006
Commissione I
Status up to 2006
Almost 14 months
(April05-May06)
Vnom:= Gain(Vnom) = 105
Gain(V) ~ Vb
Labo:
DVn/Vn = -.41±0.13 (3mnts
estimate) (measured untill
Jan’06)
Cs Calibration (at theCTB):
DVn/Vn = -.36±0.04 (3mnts)
Trieste 20 settembre 2006
Commissione I
Light source changed,
because of LED and
LED driver broken at
the end of Jan’06.
Summary: NOV’05-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
Trieste 20 settembre 2006
PMT/PhD (%)
Average slope of 15 PMTs,
PMT/PHD rise estimate in 3
months.
Commissione I
The curved fibre ageing
N. Del Prete, Francesca Sarri
50 cm
Trieste 20 settembre 2006
Commissione I
Fibre ageing
Step motor
PMT
At each step, the PMT current is
measured.
Then the wheel is positioned in
the different locations for more
precise measurements.
Shutter
The precision in the ratio Fibra1/Fibra2 is about 6 10-4 sistematics under study
Trieste 20 settembre 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.
Trieste 20 settembre 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...
Trieste 20 settembre 2006
Commissione I
Preliminary.
The precision of the method is OK. The problem is
the mechanical stability (LED position, optical
couplings etc.).
10-3
Time (h)
rms = 6 10-4
Trieste 20 settembre 2006
Commissione I
Trieste 20 settembre 2006
Commissione I
Trieste 20 settembre 2006
Commissione I