The ATLAS Tile Hadronic Calorimeter

1. The ATLAS Tile Hadronic Calorimeter Ana Henriques-CERN (For the ATLAS-Tilecal collaboration) Other Tilecal talks in this conference: Ilya Korolkov: Scintillation session Maria Varanda: Simulation session Franck Martin:Electronics session CALOR02 A. Henriques - CERN

2. ATLAS Tilecal :21 Institutes, ~200 people • Argonne National Laboratory, Argonne, Illinois, USA • University of Texas at Arlington, Arlington, Texas, USA • Institut de Fisica d'Altes Energies, Universitat Autonoma de Barcelona,Barcelona, Spain • Comenius University, Bratislava, Slovakia • National Institute for Physics and Nuclear Engineering,Bucharest, Rumania • University of Chicago, Chicago, Illinois, USA • LPC and Universite Blaise Pascal / CNRS--IN2P3,Clermont-Ferrand, France • JINR, Dubna, Russia • Michigan State University, East Lansin, Michigan, USA • CERN, Geneva, Switzerland • LIP Lisbon,FCUL Univ.of Lisbon, LIP and FCTUC Univ.of Coimbra,Univ. Catolica Figueira da Foz, Portugal • Institute of Physics, National Academy of Science,Minsk, Republic of Belarus • Pisa University and INFN, Pisa, Italy • Charles University, Prague, Czech Republic • Academy of Science, Prague, Czech Republic • Institute for High Energy Physics, Protvino, Russia • COPPE/EE/UFRJ, Rio de Janeiro, Brazil • Stockholm University, Stockholm, Sweden • University of Illinois, Urbana-Champaign, Illinois, USA • IFIC, Centro Mixto Universidad de Valencia-CSIC,E46100 Burjassot, Valencia, Spain • Yerevan Physics Institute, Yerevan, Armenia CALOR02 A. Henriques - CERN

3. ATLAS Detector Muon spectrometer Solenoid Hadronic Tile calorimeter P 7 TeV P 7 TeV 22 m Inner Detector Electromagnetic calorimeter Toroid 44 m Total weight ~ 7000 t CALOR02 A. Henriques - CERN

4. Tilecal Barrel Extended Barrel Coverage || < 1.0 0.8 < || < 1.7 Longitudinal segmentation 3 samplings 1.4 ; 4 ; 1.8 l 3 samplings 2.6 ; 3.5 ; 1.5 l Granularity ( x f) Samplings 1 & 2 Sampling 3 0.1 x 0.1 0.2 x 0.1 0.1 x 0.1 0.2 x 0.1 The ATLAS Hadronic Tile Calorimeter EB • 8.5 m outer diameter • 12.2 m long • 2900 tons • 10000 channels • Requirements for ATLAS s/E= 50%/E + 3% Barrel EB Iron/scintillator ratio 4 4 CALOR02 A. Henriques - CERN

5. Principle of TileCal: Measure light produced by charged particles in plastic scintillator. PMT WLS fiber Plastic scintillator inside steel absorber structure CALOR02 A. Henriques - CERN

6. Status of the mechanics assembly Iron cutting Submodule stacking Girder • 93% of submodules produced • 85% of modules assembled • Should finish at the end of 2002 Module assembly CALOR02 A. Henriques - CERN

7. Scintillating tiles production Pressing of tiles Granulated polysterene Mixing components • 465000 tiles ; 80 tons (100 % produced) • Done by injection molding (2min/tile) • 3 mm thick tiles in 11 sizes • Polystyrene + PTP (1.5 %) + POPOP (0.4 %). • Peak of light emission at 420 nm. • 40 cm attenuation length. • 64 photoelectrons/GeV Tiles finished CALOR02 A. Henriques - CERN

8. Tile fluctuations Sorting Batch 4 , tile 10 All the production Overall rms=3.4% I0 (BASF) ~1.25x I0 (PSM 115) Barrel rms=1.9% Ext. B A rms=1.7% Ext. Barrel C rms=0.9% Light yield: I0 PSM15 BASF • To keep Tile fluctuations inside modules <<5% • Tile sorting inside each batch • Tile masking of Basf tiles when need • to mix both polysterene tiles in a cell CALOR02 A. Henriques - CERN Tile masking

9. The WLS fibres Double clad. fibre • Kurary Y11 s-type double cladding • 1100 km (100% produced) • Light peak at 495 nm ; Latt~2.9m) • 95 % are already aluminized at one end (R~78%) • 2.5% of the fibres are measured in the Lab. • Io and Latt. fluctuations ~ 3 % Rejected fibres when rms(Io)>5% Fibre bundle polished Light yield RMS(%) Fibres being aluminized CALOR02 A. Henriques - CERN

10. A robot inserts the fibres in the plastic profiles Insertion in the profile Fibre selected Robot • Profiles have 3-4 fibres inside to provide cell longitudinal segmentation • 90% of profiles produced • ~ 1 profile /2 minutes • End of production June 2002 Profile with 4 fibres inside CALOR02 A. Henriques - CERN

11. The various steps of the TileCal instrumentation Insert profiles with fibres Fibre routing Insert tiles 1 barrel 1 Extended barrel Cut-polish fibre bundles CALOR02 A. Henriques - CERN

12. Modules certification after instrumentation Moveable Cesium source or LED through each scintillator Peak positions - results of fits of individual tiles response Bad tile/fibre coupling or broken fibre - repaired after Cs scan CALOR02 A. Henriques - CERN

13. Tile calorimeter optics instrumentation curve • Today: • EB C: 88 % • Barrel: 80 % • EB A: 62 % Module # • Expected end date: • EB C: April 2002 • Barrel: Aug. 2002 • EB A: December 2002 CALOR02 A. Henriques - CERN

14. Tile Calorimeter uniformity ATLAS requirement rms<10% Modules (1-5) to be repaired (module 1 done) The cell uniformity is 5-8% for the barrel and Ext. Barrel. ~7.5% (no tile sorting) Cell uniformity ~6.3% (PSM115 or mixed polysterene) ~5.3% (BASF polysterene) CALOR02 A. Henriques - CERN

15. Summary of TileCal construction Barrel Extended barrel A Extended barrel C Submodules 93 % done) Modules mechanically assembled (85% done) Modules optically instrumented (80% done) CALOR02 A. Henriques - CERN

16. 80% of modules already at CERN in 2 storage rooms CALOR02 A. Henriques - CERN

17. TileCal electronics Readout electronics 1.5 m long ~ 50 kg Drawer mechanics . HV distributor PMT blocks • 90% of components produced • June 02 start massive assembly CALOR02 A. Henriques - CERN

18. Tilecal pre-assembly in the surface Barrel = 1300tons Each Ext.Barrel =700 tons 9 m • Start in summer 2002 with Extended barrel C • ~6 months to mount-dismount each cylinder • Ready to go in the ATLAS pit in May 2004... CALOR02 A. Henriques - CERN