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ATLAS M uon D rift T ube wiring and testing in Greece Joint effort UoA+NTUA*

Athens,14/11/03 Chr istine KOURKOUMELIS University of Athens. ATLAS M uon D rift T ube wiring and testing in Greece Joint effort UoA+NTUA*. * supported by the GGET-Micromechanics and Microelectronics program. ATLAS MUON SPECTROMETER

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ATLAS M uon D rift T ube wiring and testing in Greece Joint effort UoA+NTUA*

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  1. Athens,14/11/03 Christine KOURKOUMELIS University of Athens ATLAS Muon Drift Tube wiring and testing in Greece Joint effort UoA+NTUA* *supported by the GGET-Micromechanics and Microelectronics program C.Kourkoumelis,UoA

  2. C.Kourkoumelis,UoA

  3. ATLAS MUON SPECTROMETER (View of non-trigger chambers) Chambers being constructed by the three Greek institutions C.Kourkoumelis,UoA

  4. ATLAS: Muon Chambers Each detector has 3 stations. Each station consists of 2-4 layers. MDT RPC MDT CSC TGC Precision chambers Triggerchambers MonitoredDriftTubes ( |η| < 2 ) with a single wire resolution of 80 μm 1194 chambers, 5500m2 GREECE is constructing 12% CathodeStripChambers(2 < |η| < 2.7) at higher particle fluxes 32 chambers, 27 m2 ResistivePlateChambers(|η| < 1.05) with a good time resolution of 1 ns 1136 chambers, 3650 m2 ThinGapChambers(1.05 < |η| < 2.4) at higher particle fluxes 1584 chambers, 2900 m2 C.Kourkoumelis,UoA

  5. : MDTs Monitored Drift Tubes width (tube length) : 83-494 cm length : 90-216 cm Tube : Al, 30 mm φ, 0.4 mm wall Wire : 50 μm, W/Re alloy (97/3) Gas : Ar/CO2 (93%/7%) at 3 bar Gas gain : 2x104 at 3080 V Maximum drift time : ~ 700 ns Resolution : 80 μm C.Kourkoumelis,UoA

  6. mH=130 GeV σ = 2.0 mH=130 GeV σ = 2.4 (+20%) Physics justification for precision in muon chambers C.Kourkoumelis,UoA

  7. BIS contruction-Greek project UoA : tube wiring + QA/QC (30,000 tubes) NTUA : tube QC/QA (certification) AUTh :chamber building (see D.Samponidis’ talk) 4+4 layers of tubes C.Kourkoumelis,UoA

  8. Construction precision requirements/specifications for MDT tubes • Anode Wire Position ( 25 μm) • Anode Wire Mechanical Tension (350 gf  5% ) • Gas Leak Rate(<2*10-8 bar*lit/sec) • High Voltage Leak Current(<2nA/meter) To comply with the above : precision tooling, clean rooms, intense QA/QC tests, etc.. @ all three institutions C.Kourkoumelis,UoA

  9. U. of Athens ATLAS_MUON Group C.Kourkoumelis P. Ioannou D. Fassouliotis I. Chatziantonaki S. Stefanidis K. Nikolopoulos D. Pappas D.A. Agriogiannis S. Tatsis 29,000 tubes built so far !! http://www.phys.uoa.gr/Atlas/MDT/ C.Kourkoumelis,UoA

  10. University of Athens : Muon tube wiring facility C.Kourkoumelis,UoA (http://www.phys.uoa.gr/Atlas/MDT)

  11. University of Athens : Muon tube wiring facility C.Kourkoumelis,UoA

  12. University of Athens : Muon tube wiring facility Wire insertion – wire tensioning C.Kourkoumelis,UoA Wire threading- wire tensioning

  13. Tube production quality checks Finished tube length Wiring tension C.Kourkoumelis,UoA

  14. DRIFT TUBE PRODUCTION IN THE UoA WORKING CONTINOUSLY SINCE Sept. 2000 STEADY PRODUCTION OF 42 tubes/day C.Kourkoumelis,UoA

  15. NTU-Athens HEP Group M. Dris E.C. Katsoufis T.A. Filippas S. Maltezos T. Alexopoulos T. Papadopoulou E. Fokitis Y. Tsipolitis E.N. Gazis E. Tzamariudaki R.M. Avramidou N. Benekos P. Savva A. Maltezos N. Papadakis N. Vodinas 27,000 tubes checked so far!! C.Kourkoumelis,UoA

  16. NTUniversity of Athens : Muon tube testing facility Anode Wire Mechanical Tension measurement T =   D2 L2 f 2 Nominal Value • L= 165 cmis the wire length • D= 50 μmis the wire diameter • ρ=19.3 gr/cm3is the density of the wire material C.Kourkoumelis,UoA

  17. NTUniversity of Athens : Muon tube testing facility High Voltage Leak Current measurement • A bunch of 16 tubes is connected in parallel and supplied by the gas mixture Ar:CO2 (93:7) at 3 bar absolute pressure and high tension of 3400 V. • The voltage drop across a resistor of 1.1 MΩinseries with the tubes is being measured for each tube. Leak Current < 2nA/m C.Kourkoumelis,UoA

  18. NTUniversity of Athens : Muon tube testing facility Gas Leak Rate measurement • The idea is to fill the tubes with the detector gas (Ar:93 %, CO2:7 %) and then measure the pressure drop due to gas leakage at the time interval t. • V is the volume of the "leaking" tube and • Δp is the pressuredrop. C.Kourkoumelis,UoA

  19. NTUniversity of Athens : Muon tube testing facility Anode Wire Position measurement MDT-axis C.Kourkoumelis,UoA

  20. Anode Wire Position measurement C.Kourkoumelis,UoA

  21. BIS quality tests @ CERN (1st chamber –out of 12 construction sites -to meet construction requirements) X-RAY TOMOGRAPHY April-01 11.7 ÷ 13.9 µm July-00 11.0 ÷ 16.2 µm The results meet the ATLAS specifications !!! C.Kourkoumelis,UoA

  22. BIS chamber construction in Greece Has been going extremely well for more than 3 years -will finish soon (by next April) ! C.Kourkoumelis,UoA

  23. BIS tests @ CERN’s-testbeams X5/GIF 2002 C.Kourkoumelis,UoA

  24. BIS tests @ home institutions NTU SETUP / NEUTRON DATA @ DEMOKRITOS UoA cosmic rays set-up C.Kourkoumelis,UoA

  25. WHAT IS NEXT?? (started during summer) NOW till SUMMER 2004 • Equip the chambers with services ( gas, electronics..) • Test EVERY chamber with cosmic rays • BE READY FOR INSTALLATION at the pit by • Aug.2004 (Olympic games)- 130 chambers C.Kourkoumelis,UoA

  26. BIS chamber integration-services C.Kourkoumelis,UoA

  27. Cosmic ray set-up @ CERN to test several chambers simultaneously 100 chambers are already constructed, should be equipped and tested C.Kourkoumelis,UoA

  28. AFTER installation (BEFORE data taking): • Cabling • Integrate/commission • Debugging electronics etc (Manpower/travelling..) +physics studies… C.Kourkoumelis,UoA

  29. Summary: Thanks to support from the Micro program we were able to : • Build infrastructure in our home institutions for precise micromechanical construction and testing of particle detectors at large scale • Build a large part of a detector and thus participate on equal basis in the world’s largest HEP experiment • Collaborate successfully with the industry In the future: • Should take advantage of the investment.. • Participate in tests, data taking, commissioning, physics studies etc • Finish detector (technical manpower at CERN) • Continue collaboration with industry/transfer of know-how C.Kourkoumelis,UoA

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