5m. 2m. The Assembly of ATLAS Muon chambers @NIKHEF. NIKHEF Muon Mission: 96 Barrel Outer Large (BOL) chambers. Tube Production Assembly Station Assembly: Tube placing & Gluing Tomograph@CERN + test stand@NIKHEF Summary: Status & Plans. Tube wiring + QC. Drift tubes: - PowerPoint PPT Presentation
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Marcel Vreeswijk (NIKHEF)
The Assembly of ATLAS The Assembly of ATLAS Muon chambers @NIKHEFMuon chambers @NIKHEF
The Assembly of ATLAS The Assembly of ATLAS Muon chambers @NIKHEFMuon chambers @NIKHEF
2m
5m
NIKHEF Muon Mission: 96 Barrel Outer Large (BOL) chambers
NIKHEF Muon Mission: 96 Barrel Outer Large (BOL) chambers
• Tube Production
• Assembly Station
• Assembly: Tube placing & Gluing
• Tomograph@CERN + test stand@NIKHEF
• Summary: Status & Plans
Marcel Vreeswijk (NIKHEF)
Tube wiring + QC
•Drift tubes:•Extruded aluminum drift tubes (3cm)
•Wire (50m gold-plated tungsten) positioned by two end-plugs
Gauge Actual Gluing:Chamber is pre-positioned: 1mm strips under sphere blocks+50% sag-comp.
Then strips are removed + 80-90% sag-compensation
Strip
Marcel Vreeswijk (NIKHEF)
Sag Compensation• Xplate sag before and after
compensation
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After sag adjustment we observe (almost) symmetric sags for chamber up and down positions-> no stress
Chamber up
Chamber (upside) down
Understoodwithin +-10m
Marcel Vreeswijk (NIKHEF) s
Tube diameter 3cmDistance 65m
Central rope,Glu: 2019
Gluing2 x glue units2x3 glue nozzles
tube
tube tube
tubetube
Side rope,Glu: 2011
automated
50m tape on
Bessel points
Marcel Vreeswijk (NIKHEF)
Gluing BOL
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Marcel Vreeswijk (NIKHEF)
Monitoring
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3 systems monitor chamber during assembly:•RASAS system (include temperature check)•In-Plane system•RASNIKS on cross-plates (sag)
badly positioned -> action!
Compensation on
Monitoring system->actions not yet user friendly….time
Sag
0
50m
Marcel Vreeswijk (NIKHEF)
The BOL-0
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The BOL-0 was mechanically
finished Dec 5th 2000
The BOL 1 was finished yesterday
Marcel Vreeswijk (NIKHEF)
Power Outage- BOL1
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Power outage Amsterdam, during curing of layer 5Chamber immediately covered with foil (sag compensation remained on + vacuum probably okNo indications for damage
Marcel Vreeswijk (NIKHEF)
Gluing BOL-1• RASAS monitors
SE
NW
SW
NE
Global Z,RASAS X
Global X
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Global Y (up)
Global Z
• Positioning spacer appears sufficiently accurate•However, differences with and without tubes (+glue) in combs --> touch•(Y pitch dangerously small)
Marcel Vreeswijk (NIKHEF)
The road to BOL-1Date Item Comment15/06 Glu Spacer Use sagcompensation26/06 Layer 1-half Problem glu-machine27/06 Layer 1-rest Ok27/06 Praxial Platforms No measurements…..
•From 1st tube layer to 6th tube layer took 14 days (spacer not counted)•With optimal/parallel preparation the present scheme would allow a 7 day production cycle•Infrastructure and manpower->
10 working-days/chamber
Marcel Vreeswijk (NIKHEF) s
Test @CERN inTomograph (BOL0)
Wire positionsRMS 16m
Analysis of Martin Woudstra
Marcel Vreeswijk (NIKHEF) s
Parameters BOL0
Zpitch wires: 30.0354m (30.0353 expected)
Ypitch wire-planes:
26.026m (26.011 expected). Especially between two inner layers we have a larger pitch. Inelastic deformation during gluing?
dY multilayers ~75m.Hard to understand. ALL chamber scanned at CERN have deviations in this parameter?!
dZ multilayers ~12m. We expected deviations of this order, based on Balmonitor measurements
•Relevant Parameters (goal 20m):
RO side =15.8m HV side =16.1m
Marcel Vreeswijk (NIKHEF)
Test stand
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DATCHADATCHA
Like cosmic ray setup at CERN (shutdown in 2000)
Test of alignment principle with prototype muon sector,using cosmic tracks --> 10m on sagitta
Marcel Vreeswijk (NIKHEF)
Test stand @NIKHEF
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Tests five chambers using cosmic rays (end 2001)•Checks wire positions•Checks DCS + DAQ
Trigger modules, consisting of 50cm iron, with two layers scintillator. Ecut>1GeVExpected rate: 100Hz
Marcel Vreeswijk (NIKHEF)
Status & Plans
• Finished BOL-0 at NIKHEF (dec. 5th 2000) with high mechanical precision (16m RMS)
• Quality Control Tube Assembly automated
• Production of tubes started May 2001
• First chamber, BOL1, produced! Difficulties due to small Y pitch.
• Automate steps+QC chamber assembly
• Cosmic ray setup end 2001….
Marcel Vreeswijk (NIKHEF) s
Expected shifts
Marcel Vreeswijk (NIKHEF)
Gluing BOL-0• RASAS monitors
SE
NW
SW
NE
Global Z,RASAS X
Global X
•Stability in Y appears good
•Relatively large Z movement layer 6 (spacer floats on glue?)
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Lever arm in stacking block
Global Z
Global Y (up)
Marcel Vreeswijk (NIKHEF)
Gluing BOL-0• Guido laser test indicate tube
heights in combs <10um.
• Stability Xplates during gluing
Start glue
Start glue
Layer 2
Layer 3
Yrasnik=2 x Sag
Start glue
Layer 1
Layer 1: dSag=7um
Layer 2: dSag=10um
•The sag of the xplates in layer 1 and 2 change in time. Glue crimp? Temperature?•Layer 3,4,5,6: Sag stable
s
Marcel Vreeswijk (NIKHEF)
Gluing BOL-0• In-Plane and Xplate monitors
•X-inplane very stable•Y-inplane alternates with chamber orientation, because off granite sag of 30um
down down
up up
Cross-plate sag. For chamber up (down) positions, a negative (positive) sag points down.
s
Marcel Vreeswijk (NIKHEF)
BOL-0
•Tubes press glue away?•Tubes deform?
•Affects precision praxial platforms!
Thickness Multi-layers BOL0 has tape between tubes at one side
2 layers
3 layers
Much work..
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Marcel Vreeswijk (NIKHEF)
BOL-0Heat Studies (No flexoos in BOL-0)
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Inplane
Yrasnik= 2 x sag
The BOL-0 was covered with heat blankets, producing 50W/m2
Gradient between MLs: 2.5 to 4 oCSag of Chamber: 200um 50 to 80 um/oC= acceptableSag of xplate: 25um 6 to 10 um/oC = acceptable
400um
Yrasnik= 2 x sag
Xplate
50um
Chamber sag
Xplate
sag
Marcel Vreeswijk (NIKHEF)
Gluing BOL-0• Result for side (106) and central (103) ropes