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University of AthensATLAS BIS
MDT assembly http://www.phys.uoa.gr/Atlas/MDT
HEP 2001 Presented byHeraklion, 6-8 April 2001 D. Fassouliotis
• D. Fassouliotis• P. Ioannou• C. Kourkoumelis• V. Pancheluga• D. Pappas• E. Stefanidis• V. Birioukov (engineer from Protvino)
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Physics Requirements of ATLAS Muon Spectrometer
•Acceptance•Efficiency•Momentum Resolution
H μμμμ
SM/SUSY Higgs New Vector Bosons
B+ J/ψK+
Beauty PhysicsCP violation
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OUR AIM:Wire/Wire/checkcheck all the Monitored all the MonitoredDrift Tubes for the ATLASDrift Tubes for the ATLASBIS chambersBIS chambers
30,000 !! Tubes – 128 chambers
With Construction specifications…:
Wire position ± 25 μmWire tension 350 ± 15 grGas leak rate < 10-8 bar*l/s at 3 barLeak at 3.4 kV (gain 1.6*105) < 2nA/mFinished tube length 1671.50 ± 0.25 mm
…necessary to achieve the physics results
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TO ACCOMPLISH AIM:
Build a clean room•20±1 oC•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
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End-plug assembly procedureVisual inspectionMeasure end-plug diameter Clean all components in ultrasonic bath with 100% ethyl alcohol.Insert twister / stopperInsert springInsert/crimp copper pinInsert O-ring
Daily operational tasksCheck of air-condition system Verification of 200 and 8 Atm pressures ActionsCalibration of mechanical tension meterCalibration of Tube Length fixing systemCalibration 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 endplugsCrimp wire on the left hand side Move to second position / respect clockingPass wire through right hand side tube crimperFix 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 procedureFinished tube Length measurementCoaxiality measurementWire tension measurementDark Current measurement
Tube verification Measure wall thicknessVisual inspectionClean if needed
Wire verification Visual inspectionThrow part if needed
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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
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Upper: View of the wiring table during Module 0 production.Lower: View of the wiring table after the reinforcement upgrade.
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Go/no-go gauge
Tooling for copper pin crimping on the brass sleeve.
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The wire crimper holder
The micrometric adjustable mount of the tube clamp
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Novel wire tensionmeter in use
low-cost compact reliable
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Finished Tube Length
Wire Tension
Some Results
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Tube Assembly as a function of time
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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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M D T P ro d u ction - S ta tu s 28 F eb .01
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Greece
0
4
8
12
16
20
Jul-00 Sep-00 Nov-00 Jan-01 Mar-01 May-01 Jul-01
Time
No.
Cha
mbe
rs
Glued Chambers
Chambers with Services
Plan Glued Chambers