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University of Athens ATLAS BIS MDT assembly HEP 2001 Presented by Heraklion, 6-8 April 2001 D. Fassouliotis D. Fassouliotis.

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Presentation on theme: "University of Athens ATLAS BIS MDT assembly HEP 2001 Presented by Heraklion, 6-8 April 2001 D. Fassouliotis D. Fassouliotis."— Presentation transcript:

1 University of Athens ATLAS BIS MDT assembly http://www.phys.uoa.gr/Atlas/MDT HEP 2001 Presented by Heraklion, 6-8 April 2001 D. Fassouliotis D. Fassouliotis P. Ioannou C. Kourkoumelis V. Pancheluga D. Pappas E. Stefanidis V. Birioukov (engineer from Protvino)

2 Physics Requirements of ATLAS Muon Spectrometer Acceptance Efficiency Momentum Resolution H  μμμμ SM/SUSY Higgs New Vector Bosons B +  J/ψK + Beauty Physics CP violation

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4 OUR AIM: Wire/ check all the Monitored Drift Tubes for the ATLAS BIS chambers 30,000 !! Tubes – 128 chambers With Construction specifications…: Wire position ± 25 μm Wire tension 350 ± 15 gr Gas leak rate < 10 -8 bar*l/s at 3 bar Leak at 3.4 kV (gain 1.6*10 5 ) < 2nA/m Finished tube length 1671.50 ± 0.25 mm …necessary to achieve the physics results

5 TO ACCOMPLISH AIM: Build a clean room 20±1 o C Class 50,000 Develop a wiring table+wiring tools Flat top Tube holders Alignment of two end-plug-holders End-plug insertion (coaxility tube/end-plug) Tube pressure crimping Speed of wire threading Wire tensioning Develop on-line QA of tube construction parameters Length check End-plug/tube axis coaxiality Wire tension SITE WAS CERTIFIED ON MAY 1999

6 End-plug assembly procedure  Visual inspection  Measure end-plug diameter  Clean all components in ultrasonic bath with 100% ethyl alcohol.  Insert twister / stopper  Insert spring  Insert/crimp copper pin  Insert O-ring Daily operational tasks  Check of air-condition system  Verification of 200 and 8 Atm pressures Actions  Calibration of mechanical tension meter  Calibration of Tube Length fixing system  Calibration of Tube length measurement system  Packing / Unpacking Tubes  Check of alignment Wiring procedure  Place tube to first position / scan bar code  Thread wire in tube  Insert wire through the endplugs  Crimp wire on the left hand side  Move to second position / respect clocking  Pass wire through right hand side tube crimper  Fix length (choosing gaps) with movable LHS crimper  Secure and Crimp tube  Perform pretension / tension  Crimp wire on the right hand side Tube is ready QA/QC procedure  Finished tube Length measurement  Coaxiality measurement  Wire tension measurement  Dark Current measurement Tube verification  Measure wall thickness  Visual inspection  Clean if needed Wire verification  Visual inspection  Throw part if needed

7 SINCE THEN Several Improvements with the aim Minimize failures (rejected tubes) Increase Production Rate Reach Production Stability Decrease Maintenance Operations Wiring table reinforcement / expansion freedom End-Plug Preparation go/no-go gauge / copper pin crimper Wiring Tooling Wire crimpers + base / tube clamps / pressure valves Automatization See E. Stefanides presentation QA/QC Tooling Tube length meas./ coaxiality meas. / tension meas. Operational Details

8 Upper: View of the wiring table during Module 0 production. Lower: View of the wiring table after the reinforcement upgrade.

9 Go/no-go gauge Tooling for copper pin crimping on the brass sleeve.

10 The wire crimper holder The micrometric adjustable mount of the tube clamp

11 Novel wire tensionmeter in use low-cost compact reliable

12 Finished Tube Length Wire Tension Some Results

13 Tube Assembly as a function of time

14 As a summary … Minimize failures Dramatic decrease of accidental incidents Decrease of failures due to tolerances Increase Production Rate 5 min /tube + 2 min end-plugs Reach Production Stability Average of ~45 tubes /day 5800 MDTs assembled so far !!! Decrease Maintenance Operations Finance providing Our commitments will be fulfilled

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