Introduction Construction and integration status Performances Conclusion

8/18/2004 E. Monnier - CPPM - ICHEP04 - Beijing 1

Atlas liquid argon calorimeter status

E. Monnieron behalf of the Atlas liquid argon calorimeter group

Introduction Construction and integration status Performances Conclusion


Design performances

Benchmark channels: H→, H→4e, W’, Z’…

+ running conditions Design requirements: energy resolution and uniformity

σ/E = 10%/√E ⊕ 0.7% for e, σ/E = 50(100)%/√E ⊕ 3(10)% for jet |η|<3 (3<|η|<5)

Angular resolution: 50 mrad/√E for e, Linearity of 0.1% for e, and <2% for hadronic Particle id and separation: e, jets, , π0

Dynamic range 20 MeV to a few TeV Time measurements, Hermiticity, Radiation….


EM Endcap Ps |η|<1.8

EM Barrel+Ps

Hadronic Endcap

Forward

The Atlas larg calorimeters

Em barrel |η|<1.475 (Pb/Lar) Em endcap 1.375<|η|<3.2 (Pb/Lar) Hadronic endcap 1.5<|η|<3.2 (Cu/Lar) Forward 3.2<|η|<4.9 (Cu, W/Lar)

> 200000 channels


32 Modules coldtested and integrated

EM Barrel

Barrel Closed

cooled down

MC

e

<0.014% dead channels ! 0.1% HV ½ gap isolated Barrel at LArg temperature Under extensive test In the pit early October


Endcap: EM 1/4

8 Modules coldtested and integratedPer wheel !


Endcap: HEC 2/4

32 Modules cold tested and integrated

Per wheel (2x2)

Space to insert Fcal

Hec2, Hec1, Emec


Endcap: FCAL 3/4

3 Modules cold tested and integrated per wheel

Cu (em)W (had)


Endcap 4/4

EC C, Em+Had+Fcal integrated Closed and ready for cold test

EC A, Em integrated, Had under integration, Fcal ready for integration

Em: <0.005% dead channels and 0.1% HV ½ gap isolated Hec: 0.03 % dead channels and 0.14% HV gap isolated Fcal: 0.03, 0.17 and 0.55 % of HVRod isolated Calorimeter system moving toward commissioning phase !!


Beam test Performances

4 barrel and 3 endcap EM production modules tested 24 HEC prod modules tested (3 frt+3 rear/test) Fcal-C tested HEC/EMEC combined testEM End-capEM Barrel EMEC/HEC


EM linearity and energy

resolution

Linearity within ±0.25 (0.1)% for E>10 (40) GeV Energy resolution within spec and MC agreement

Normalized to 100 GeV η=0.7

Beam energy (GeV)

Lin

eari

ty (

Er e

c/ E

beam

)

Beam energy (GeV)En

erg

y r

esolu

tion

9.4% /E0.1%


EM Uniformity

Global constant term within spec (0.7%)

Barrel P13 P15<E> 233.3 GeV 236.6 GeVRMS 0.57% 0.64%

EndCap ECC0 ECC1 ECC5<E> 119.7 GeV 120.0 GeV 120.2 GeVRMS 0.58% 0.53% 0.55%

EndCapBarrel

Energy (GeV)η (middle)

En

erg

y (

GeV

)


Position and angular resolution

within spec

55 mrad/√E

Z~20mm

Z~5mm

245 GeV e

Endcap ~1.7

Energy (GeV)20 100 150

θ (

mra

d)

x √E

~550 mmat =0

~250 mmat =0

Barrel

Barrel

re

solu

tion

(

un

its x

1000)


Time measurement

Cell energy (GeV)

Barrel

Tim

e r

esolu

tion

(p

s)

Fast signal in Argon accurate time measurement Zvertex measurement, long lived particle id,… Front end electronic very low constant term < 20ps

70ps constant term within spec (100ps)


Muon measurements

Muon signal large enough in middle layer but also seen in strips: S/N = 7 Endcap S2 S/N = 7-10 in Barrel S2 Seen also in HEC

Endcap

Barrel

Powerful tool for commissioning:intercalibration (1ns), position (0.5mm EM, mms HEC),uniformity (<3‰ EM, 1% HEC) …


(84.1 0.3)% /E

Emec/Hec combined test

Emec + Hec (3frt+2rear), non pointing geometry Study 1.6<||<1.8 calibration constants for atlas e/h compensation: weighting of em cluster energy MC validation: room for improvement


Fcal calibration run

FCAL energy calibration Edge scan at high || + HV test

a=(3.760.06)%b=(24.50.84)GeV %c=(145.51.6) GeV%

P

c

P

ba

E (GeV)

σ/E

(%

)

Electron energy resolution


Combined tests with “final” atlas setup and readout Barrel: Tracker, EM, hadronic calo, Muons system End-cap: EM, HEC, FCAL Tuning ATLAS hardware, online and offline software, calibration…

TRT LAr

Tilecal

MDT-RPC

EMEC

HEC front

HECrear

FCAL 1

FCAL 2Cold TC

WarmTC

2004 beam tests

(the last before LHC)


Next

2005: Install electronicsOctober 2004

1 March 2004April 2004

2005: EC cryostats…


Conclusions

Larg calorimeter system in its final integration stage before installation in the pit: October for barrel Beam tests have exhibited required performances Combined 2004 beam test with final ATLAS readout system ongoing successfully Readout electronic under production Commissioning phase will start next year

But still a lot of work and understanding of the system to be ready for first data in 2007

Introduction Construction and integration status Performances Conclusion

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