Calorimetria di ATLAS

Napoli, 21 Settembre 2005 C.Roda per Lar & Tile ATLAS Italia1

Calorimetria di ATLASCalorimetria di ATLAS

HADRONIC TILECAL

EM ACCORDION ECA

Barrel

ECC

ECA

Barrel

ECC


Fasi del CommissioningFasi del Commissioning

• PreCommissioning on surface• Commissioning in the Pit:

– Fase 1: Calorimetria LAr & Tile testati come entita` independenti – da ora fino all’estate 2006

– Fase 2: • Integrazione di LAr e Tile con i servizi: cabling, DCS, DAQ,

trigger +• Integrazione di LAr e Tile for cosmic ray run – fine 2005 fino a

fine 2006 (also indicated as LArg phase 3 commissioning)– Fase 3: Run di cosmici con il rivelatore di ATLAS

completo – inizio 2007

In vari periodi le diverse fasi si sovrappongo


LAr and Tile Barrel installation in pit completed on 10/12/2004

LAr and Tile Barrel installation in pit completed on 10/12/2004

LAr and Cryostate

TileCal


• Commissioning Phase 1 is constitued by 13 WP (Cable & Module installation & QC, FE readout electronics test, Electronic for Calorimeter Trigger, Cesium, Laser, DCS, HV-LV, ROD) • Commissioning is being taken care of by all Institutes.• Iacopo Vivarelli is responsible for the DAQ tools -> coordinates the commissioning effort

Since then we have been working to the commissioning of TileCal in standalone (Phase 1):

• Install F/E electronics, LV-HV, cables/fibres

•Debug the individual elements

•Cosmic ray runs

Commissioning Fase 1 Barrel TileCalCommissioning Fase 1 Barrel TileCal


Commissioning Fase 1 - TileCalCommissioning Fase 1 - TileCal

Stability test for FE electronics for readout and trigger, HV ps with Mobile DAQ in the pit; long duration test is now at about 65% of Barrel, problems found are being fixed, most of them connected to HV that are tested for the first time; During summer 1 expert week on june, trigger signal from towers sent to special FPGA cards to trigger on projective muons. First cosmic ray run in the pit Next expert (long) week 19-28 September: 12 Modules (10% Barrel) with Real ROD, whole DAQ chain including all trigger levels with dummy algorithms, monitoring, LV ps test on 4 of the tested modules, DCS for LV-HV and cooling. On the critical side are the LV ps, however the situation is getting better and we are still on schedule (LV ps installed by end of November)

May

November


Commissioning Fase 1 - TileCalCommissioning Fase 1 - TileCal

26 Ottobre Barrel moved at interaction point z=0 → beginning of phase 2. This movement has been shifted by 7 weeks with respect to previous schedules for delayes related to installation of toroid and ID services; No major worries for this delay however the schedules are being adjuasted.

ALL THE DATES I AM SHOWING ARE ALREADY SHIFTED BY TWO MONTHS

Beginning of 2006 - Start of phase 1 for EBC and than for EBA, installation to pit & commissioning phase 1 2006 will see: commissioning of Barrel phase 2 + commissioning EBC phase 1 followed by commissiong of EBA phase 1 the experimental pit will start to be very crowded thus the work in the pit is very carefully planned.


PreCommissioning– EndCap LAr PreCommissioning– EndCap LAr @Building B180 cold tests:

EndCap A Start of cool down - June 13

Detector filled with Lar - August 16

Ready for cold tests - August 22

End of test 25/9: but might need a few more days

Milano involvement:– HV tests (all subdetectors: EMEC, FCAL, HEC)– Time Domain Reflectometer (TDR) measurements: characterization of calibration lines

(EMEC)


HV DCS Control – LAr HV DCS Control – LAr

First prototype of Finite State Machine DCS control: HV control for EMEC LAr in ATLAS


Set up al B180 e USA15Set up al B180 e USA15

B180

7 HV crates for cold test of ECA in B180

The end of the ECA cold test (end of warm-up by Mid november) will be the end of the activity in B180.

HV setup (crates & workstation) moved to USA15 for the cool down and for the test with cosmics of Barrel first and EndCap later.


Set up al B180 e USA15Set up al B180 e USA15

USA15

8 ISEG HV Modules

First HV crates already in USA15 to perform stability test of HV ISEG modules Loard simulators


Commissioning Fase 1 – LAr Commissioning Fase 1 – LAr

Barrel: 3/32 electronic crates installed and tested so far: a few more crates partially equipped not powered yet. Test procedure established after some experience. Set of measurements: pedestals, calibration (ramp, delay runs),... Monitoring uses Athena and root

Endcap C:– Ready to be transported in the pit – After the endcap is in the pit (by end of November) and extended tile is completed next step will be the installation of the services


Commissiong Fase 1 LAr – integrazione dei servizi

Commissiong Fase 1 LAr – integrazione dei servizi

Endcap Services (A and C) installation under Milano responsibility: Design started beginning of August (~200 drawings!) and is now completed. A few issues with Tiles services clarified in the meantime. Formal approval expected within days The Collaboration congratulates for the work done

Next Steps: Service material (responsibility of BNL) is available due to the complexity of the system and the tight installation

schedule → preassemble and test using a mock-up in Milano. This allows to reduce time and costs A wedge of the mock-up has been modified to have the possibility

to vary the position of the crate in order to simulate the various typologies of services

First assembly tests have started


LV PS

Mock-up in Milano

FEB


Commissioning Fase 2 Tile – integrazione dei servizi

Commissioning Fase 2 Tile – integrazione dei servizi

Phase 2 will start when moving to interaction point z=0 → 26 Ottobre 2005.

Final Cabling to be completed to connect to USA15 2 Barrel partitions commissiong (4 ROS) central DAQ (~

5000 channels) with CIS, Laser (LED backup) – 1.4.06 Setting of EM scale: carry out complete Barrel Cesium

calibration Cosmic muon run with final DCS, DAQ, … stability

performance with calibration & cosmics Use Low level online monitoring for debugging Trigger will cover all range (<0.8) and partially in

(<1.2 top and bottom) Integration of Tile Barrels in final DAQ 5.2006


Commissiong Fase 2 Barrel LAr – integrazione dei servizi

Commissiong Fase 2 Barrel LAr – integrazione dei servizi

LArg Phase 2 Commissioning: (01/01/06-01/03/06) Should demonstrate stable data taking condition Integration in DAQ and DCS Check electronics beyond Phase 1 tests, noise over

whole calorimeter (and replace electronics if needed) Start barrel cool down

HV DCS is under Milano responsibility: In this phase DCS will play a crucial role in controlling

the system The goal is to provide by that time integration of the

system with the rest of the DCS, Alarm handling and output in the Condition Database (PVSS → COOL DataBase)


Commissiongin phase 2 LAr - operationCommissiongin phase 2 LAr - operation

Cold Calibration: (01/03/06-01/05/06) • fully qualify the electronics performances: stability

measurement over long period (FEC temperature), tuning of parameters (timing, …),

• Take calibration data to demonstrate performances (noise, electronics). Produce calibration (ramps, Optimal Filtering) to fill databases with best calibration gains and Optimal Filtering coefficients

• Milano will produce Optimal Filtering Coefficients using the RTM (“Milano”) method. Now working on the SW infrastructures to handle in Athena and in the DB all the calorimeter modules

• Set High Voltage ON


Commissiong Fase 2 – integrazione LAr & Tile Commissiong Fase 2 – integrazione LAr & Tile

Setup of LVL1 implemented with TileCal triggering signal - timing, readout sync. Trigger will cover all <0.8 <1.2 (top and bottom) . Rates measured by Tiles in June with 1/6 of trigger modules: ~1 Hz (single tower), few mHz (back to back) Combined cosmic run start: 1.6.06 LArg Test beam muons: S/N~7


Other ongoing activities – Pisa group Other ongoing activities – Pisa group • Laboratory test on PMTs and fibers at the Pisa laboratory :

Characterization of PMT aging @ 1-2 LHC years full luminosity

Study of light losses in bended fibers

• Physics analysis:– Higgs channels produced in VBF with H decay to b or tau’s,

Z+jet → bb jet, Single top production (with Trieste).

• CTB analysis. Single pion study comparison with G4 for E [20,300] GeV. Recently started study on low energy data E [1,10] GeV

• Jet Calibration at hadronic energy scale

• Tile Muon identification and tagging

• GNAM Online monitoring and OHP presenter


Other ongoing activites - MilanoOther ongoing activites - Milano

EM Calibration: – Study of a calibration scheme based on Geant 4– Achieve good resolution and linearity at the same time– Ongoing work (MC: no noise, single particle from z=0 at one h position):

• Fit calibration coefficients• Study energy and dependence• Study particle dependence (electron, photon)

Study of the channel H→:– Evaluate ATLAS performance on this channel– Test calorimeter performance, test EM calibration scheme

Study of Z lep+had+’s– Control sample for reconstruction of t’s and for calibration of ET

miss during commissioning: s(MZ) s(ET

miss)– Study finalized to the analysis of the H/A MSMM decay– Expected ~2000 events in mass bin (66-116 GeV ) ~5% (+/-5%) from

main background (W+jets ) for an integrated luminosity of 10 fb-1

– Next: Tune cuts, add other backgrounds (bb, tt)


Position of Pisa and Milano in ATLAS organization

Position of Pisa and Milano in ATLAS organization

Responsabilities for Pisa

Tile DAQ-tools (commissioning)

Tile Online Monitor

Tile G4 Simulation of Real Detector

Tile Physics Data Quality

Co-cordinator of JetETmiss group

Chair of Tile Institute Board

Responsabilities for Milano

Co-coordinator JetEtMiss and tau groups

LAr electronic coordinator

Responsabile ATLAS Italia

Member of LArg representative group and member of BarrelPhase3Commissioning and EndCapPhase3Commisiong steering group

• In RED we ask for integration of ME


Milestones Tile 2005Milestones Tile 200531/03/05 –

– Codifica algoritmi per il timing con impulsi laser OK– Implementazione del monitor on-line per test in UX15 OK

30/04/05 –– Studio identificazione globale dei mu (recupero perdita di energia ed

isolamento) OK

31/05/05 - identificazione dei mu di basso pt al LVL2 nel framework HLT OK

30/06/05 -Tests temporizzazione sul Barrel in UX15 solo con cosmici

31/10/05 - Completamento cablaggio Barrel (a Z=0) delayed Jan 2006

30/11/05 - – Integrazione del monitor nella DAQ provvisoria (MobiDAQ) per run di cosmici

OK – Implementazione degli algoritmi nella ricostruzione combinata dei mu (Offline

in ATHENA) OK – Temporizzazione del barrel con impulsi laser delayed Jan 2006

31/12/05 - Inizio installazione EBC in UX15


Milestones 2005 LAr Milestones 2005 LAr

31/08/05– Installazione SW e inizio tests HV in USA15 OK

31/08/05– Inizio misure HV sul Barrel a z=0 delayed to Nov/Dec– Completamento misure HV finished on 25.9 – TDR di ECA (in B180) finished on 18.9 – Analisi dei dati del test beam in via di finalizzazione

OK

31/10/05– Inizio integrazione dei servizi su EC-C in UX15

delayed to Jan 2006


Milestones LAr & Tile 2006 Milestones LAr & Tile 2006 31/03/06 LArg Delay runs, master waveforms per calcolo OFC nel DB del calorimetro e.m. barrelAprile/06 Tile Completamento Assemblaggio Tile EBA in UX15 31/05/06 LArg Completamento installazione dei servizi su LArg ECC e ECAGiugno 06 LArg + Tile Cosmic Run with Tile and LArg31/10/06 LArg Implementazione SW del controllo HV su tutto il LArg nello standard DCS di ATLAS Dicembre /06 Tile Commissioning Tile EBC e EBAGennaio/07 LArg + Tile Cosmic ray run su Tilecal+LArg Endcap

Le date delle milestone sono indicative, spostate di due mesi rispetto a quelle previste per il ritardo di 7 settimana dovuto al ritardo nello spostamento a z=0. Il nuovo programma con le date precise e` in via di definizione.


Back up slidesBack up slides


HV systemHV system

Software status:Iseg SW (OPC server)

– Good progress: V4.0 under use now pretty stable

Milano is responsible of the HV control SW (OPC client)

– Program used for barrel, ECC cold tests and test beams

– Current version under use now for the ECA cold test

Now working on the integration with the rest of the DCS system

– ATLAS DCS hierarchical system, FSM (Finite State Machine)

– FSM: main tool for the implementation of the full control hierarchy in ATLAS, handle the states and transitions of the different parts of the detector.

– In near future this activity will need increasing interaction with DCS at CERN

First prototype available for EMEC

Hardware status:Task force (three Milano people involved) to investigate past Iseg module failures still in actionNew repaired (optocoupler exchanged) modules under test8 modules (256 channels) under test on Milano load boxes (1.5 F and 150 k per chan) at max voltage since 7/7:

– 1 single channel failure (regulation problem)

51 modules in use for ECA cold test at nominal voltage:

– 1 single channel failure

Endurance test will continue at least up to 25/9


Group composition PisaGroup composition Pisa

Paolo Adragna (Dott) 100.

Vincenzo Cavasinni (PO) 80.

Tarcisio Del Prete (INFN) 100.

Andrea Dotti (Dott) 100.

Vincenzo Flaminio (PO) 20.

Francesca Sarri (Dott) 100.

Anna Lupi (Ass) 100.

Chiara Roda (RU) 80.

Giulio Usai (Ass) 100.

Iacopo Vivarelli (Ass) 100.

FE 8.8

Neolaureati 1 livello: Paolo Francavilla

Laureandi (spec.): M. Canneri, P. Francavilla, M. Cascella

Neo-Dottorato: Iacopo Vivarelli


Composizione del Gruppo MilanoComposizione del Gruppo MilanoRicercatori :

– D. Banfi (Dottorando, 100%)

– L. Carminati (Ass. Uni., 100%)

– D. Cavalli (Dir. Ric., 100%)

– G. Costa (Dir. Ric., 100%)

– M. Delmastro (CERN Fellow, 25%)

– M. Fanti (Ric. Uni., 100%)

– L. Mandelli (PO, 100%)

– M. Mazzanti (1° Ric., 100%)

– L. Perini (PA, 100%)

– F. Tartarelli (Ric., 100%)

Tecnologi:

– M. Citterio (1° Tec., 45%)

– S. Coelli (art. 23., 10%)

Tot: 10 fisici, 2 tecnol. (9,80 PE)

Laureandi:

– C. Paleari

Tecnici:

– G.Braga (100%), B.Monticelli (100%), F.Alberti (60%)

Coordinatrice WG Jet, e PTmiss Perf.

Membro LAr repres group; Membro BP3C e ECP3C steering groups

Responsabile ATLAS Italia

LAr electronic coordinator


EM Signal Reconstruction - CBTEM Signal Reconstruction - CBTOptimal Filtering Coefficents (Milano Method) ready for all EMB cells (all samplings) in database

– Default method for test-beam reconstruction in the offline

– Used by most of the on-going analysis in the Collaboration

LAr Optimal filtering coefficients standalone results are already comparable to previous testbeam for resolution and uniformity

– Uniformity measured on a smaller number of cells

2006 activity:– Prepare infrastructures and get

ready for cosmic ray run

Ene

rgy

(GeV

)

rms0.62%

0.45%

4.5‰0.49%

P13 module

P13 module > 7

P15 module > 7

preliminary

RMS<E> = 0.36%

Ebeam=245 GeV


Towards Data Taking Towards Data Taking

After the barrel cryostat has been cooled down, filled, sub-cooled and stabilized:– Checking LC at cold (1/2 crate)

• Some FEBs removed, need to be re-tested afterwards

– Ramp up HV (procedure used in B180 barrel), decide on HV sparking of some channels• Take care not to damage calibration resistors, re-measure Rcal after treatment• Some FEBs need to be removed, need to be re-tested afterwards

– Calibration runs at cold – compare with measurements from B180 and at warm

In February and beg. of March 1 week of solenoid mapping with the solenoid field on

– We consider some coherent noise measurements (pedestal runs)

Set-up trigger from tiles Rough timing adjustment between our detector and the LVL1 acceptAfter TDAQ integration with tiles check synchronisation with Tiles read-outDCS, interlocks installed and working

– Especially FEB temperatures of great importance


EM Energy reconstructionEM Energy reconstruction

Calibration scheme based on Geant 4 Montecarlo:– Calibration hits: energy lost in dead materials (upstream, downstream,

absorbers)– Also tested with test beam data 10-250 GeV

Achieve good resolution and linearity at the same timeOngoing work (no noise, single particle from z=0):

– Fit calibration coefficients– Study energy and dependence– Study particle dependence (electron, photon)

In future apply to H→analysis and evaluate performanceEM calibration activity (and H→performance studies) will

continue also in 2006

impactcellleaki

visi

sampl

visvisPS

visPS

rec fdepthfEf

EdEEEcEEbEaE 3,11 )(1

)()()()(

Energy lost upstreamof PS (cryo,…)

Energy lost betweenPS and calo

Inverse sampling fractionand lateral leakage

Longitudinalleakage

modulations


Parameter extraction Parameter extraction


Parameter extraction & resultsParameter extraction & results


Energy reconstructionEnergy reconstruction


ETmiss, reconstructionETmiss, reconstruction

Study of Z lep+had+s

Control sample for reconstruction of ’s and for calibration of ET

miss during commissioning:

(MZ) (ETmiss)

~ 40 k evts (Rome data)– Digitized with noise in calorimeter– Analysed from AOD and CBNT ROOT

ntuple

ETmiss reconstructed

from all calo cells in ||<5 with |Ecell|>2(noise) (H1-style weights)

or from cells in topoclusters (H1-style weights)

Muons contribution (muons reconstructed in spectrometer) Cryostat correction

Next:– Tune cuts– backgrounds (also bb,tt)

pt(jet) > 30 GeV, ||<2.5pt(lep) > 16 GeV, ||<2.5

1.8< < 2.7 or 3.6< <4.5 mT(lept-pTmiss)<25 GeVpTmiss>18 GeV

-likelihood > 8 (-eff ~ 30%)

No lepton isolation

Applied TDR cuts : No retuning

Expected ~ 2000 evts in mass bin (66-116 GeV ) ~ 5% (+/-5% !!) from main background (W+jets ) for an integrated luminosity of 10 fb -1

invariant mass for Signal and Background

<> ~ 91.8 ~ 13.9


Now in the pitNow in the pit

Ready to roll inside the toroids into the final position...


Status of BARREL commissioning (now!)

• Mechanics:

• installation OK, • movement of barrel tested OK,• geometry within envelope.

• Electronics:

• Drawers: some failures (10%), after burning; being fixed• LV PS: still on critical path but the first 20 units being delivered

this week• HV, work in progress, still some problem of stability (readout?).• RODs: units are almost ready, programming still in progress


Tests in Pisa: PMT long run tests (G. Usai, F.Sarri)

Test of stability of PMT operating in LHC

environement for 1-2 years at full luminosity.

We badly need air conditioning

system to have a stable and reliable

system


On the fiber setup we did not do much... And gave priority to PMT tests.

We recovered the old setup and checked results.

The Fic didn’t boot. Discovered a weared off backup battery... Which is out of production... After few months got a replace.

A VME crate started giving problems...

We planned some changes in the setup:– Modify the shutter and the light splitter

– Use different light source (more intense and pulsed). The pulsed light should improve on the stability

– Re-write the DAQ

To carry on the tests we need:– New light source, the same as needed for PMT tests

– A more modern DAQ


Physics analysis.Two analyis to check the possible use of a LVL2 “b-tagger” (FASTRACK a la CDF or battery of CPUs).

•pp->j+Z+X with Z->bb (b-tagged jets); if possible to trigger on this channel it would be the ideal way of calibrating the b-jets.

•pp->bb+A/H with A/H->bb (3/4 b-tagged Jets); this is a standard discovery channel of the supersymmetric Higgs.

In both studies the b is assumed to decay hadronically and be identified by impact parameter.

The advantage is the BR, the disadvantage is the tag efficiency, mistags.

•pp->Hqq +X with H->


Back

Energy in a cone around a tagged muon (G. Usai)

Cone radius


• Mean value for CIS signal as PMT function• Distribution (48 PMTs) of mean value for CIS signal• Distribution (48 PMTs) of rms for CIS signal• Signal Timing as PMT function (no corrections applied)

1

2

3

4

BackBack


Energy distribution Ebeam = 180 GeVEnergy distribution Ebeam = 180 GeV

180 GeV =0.35

LArg

TileCal

LArg + TileCal

E (MeV)

E (MeV)

E (MeV)

Ent

ries

(A

.U.)

Ent

ries

(A

.U.)

Ent

ries

(A

.U.)

Back


Mean reconstructed energyMean reconstructed energy

3%

Back


20 Gev 50 Gev

100 Gev 200 Gev

Using weighting techniques on CTB data (Chiara, Iacopo, Andrea)

i

iiii E

baEw )(

The energy of cell i is weighted:

a, b are obtained by minimizing:

e beam

beamii

E

EEw2

Linearity Resolution

RawCorrected

Back


This activity comes along with the Jet Energy reconstruction/calibration (Chiara, Iacopo).

Calibration of DC1 dijet (QCD) sample has been done, in progress the work on the “Rome-layout” production.

Few methods of jets reconstruction (cone, kt, topojet) and then recalibration.

Results of our method: linearity +-2% (0.02-4 TeV) resolution improves by 15%

The package is now one of the standard method in Athena.

Chiara is becoming the convener of the jet reconstruction and calibration for ATLAS group

Back


Signal QCD

LVL1 Rate

KHz

- 4.9

LVL2 Rate

Hz

- 98-10

Kin. Sel+2b

fb

1098 195000

80<Mbb<100

fb

551 21100

Jet+Z->bb (V. Cavasinni and I. Vivarelli)

S/B S/√B

30 fb-1

2.5% 20.6

Needs to lower the jet thresholds to have sidebands for bknd subtraction, hence reduce the rates at LVL2 by fast tagging b-quarks.

Back


pp-> bb+A/H->4b (3/4 tagged) (V. Cavasinni and I. Vivarelli)

Selection εS εB S

(30 fb-1)

B

(30 fb-1)

S/B S/√B

Official ATLAS HLT menu

0.11% 1.6 10-9 140 4630 3.0% 2.0

Improved multijet trigger

1.1% 1.3 10-8 1380 36850 3.7% 7.2

The proposed trigger allows to have a factor 10 more statistics.

To avoid too large QCD rate it needs fast b-tagging.

It is a counting experiment where the new scheme of triggering can improve the significance over the standard trigger menu.

Back


ATLAS light HIGGS discovery potential at 30 fb-1

• Vector boson fusion qqHat least one decaying leptonically) fundamental at masses 120-140 GeV.

Back


HVBF hhF.Sarri, V. Cavasinni, I.Vivarelli)

In this channel, comparing to the one with at least one tau leptonic decay, we have an additional

huge background from QCD:

fbhhBRHBRVBFsig 125)()(

11103.1)10(

GeVpTQCD

sig

The algorithm to identify ’s and reject QCD jets is the fundamental ingredient.

Use the results of the Milano,Freiburg groups: D. Cavalli, M. Heldmann

Back


“Soft” cuts: essentially lower pt thresholds

HVBF hh signal vs QCD backgroundpreliminary

Back


Analysis of VLE data

In the 2004 CTB we had a period of low energy beams (E=2-9 Gev)

• Important to check Calorimeter system performance at low energy:

• a Jet is made of low energy particles• Check recalibration methods at these energies

• A good exercise to exploit a complete ATLAS slice

Set upBack


Analysis of VLE data (2)

Data are not easy to analyse:• Pions and electrons,• HE muons (primary beam),• LE Decay muons.

To remove HE muons and identify e, we need to exploit all the ATLAS slice: TRT for electrons, MDT and D-cell of Tile for HE muons.

e

The work has just started

Back

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