university of athens atlas bis mdt assembly phys.uoa.gr/atlas/mdt
DESCRIPTION
University of Athens ATLAS BIS MDT assembly http://www.phys.uoa.gr/Atlas/MDT. D. Fassouliotis P. Ioannou C. Kourkoumelis V. Pancheluga D. Pappas E. Stefanidis V. Birioukov (engineer from Protvino). HEP 2001 Presented by Heraklion, 6-8 April 2001 D. Fassouliotis. - PowerPoint PPT PresentationTRANSCRIPT
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)
Physics Requirements of ATLAS Muon Spectrometer
•Acceptance•Efficiency•Momentum Resolution
H μμμμ
SM/SUSY Higgs New Vector Bosons
B+ J/ψK+
Beauty PhysicsCP violation
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
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
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
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
Upper: View of the wiring table during Module 0 production.Lower: View of the wiring table after the reinforcement upgrade.
Go/no-go gauge
Tooling for copper pin crimping on the brass sleeve.
The wire crimper holder
The micrometric adjustable mount of the tube clamp
Novel wire tensionmeter in use
low-cost compact reliable
Finished Tube Length
Wire Tension
Some Results
Tube Assembly as a function of time
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
M D T P ro d u ction - S ta tu s 28 F eb .01
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Glued Chambers
Chambers with Services
Plan Glued Chambers