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Test, Integration andCommissioning of Monitored Drift
Tube Chambers for the ATLASBarrel Muon Spectrometer
HEP 2005, Lisboa
23rd July, 2005
Jörg Dubbert
MPI München LMU München
– p.1
Overview
• Introduction
• Tests and Commissioning at the Production Site
• Integration and Commissioning at CERN
• Summary and Outlook
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.2
Introduction
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.3
Introduction (1)The ATLAS Muon Spectrometer
• Physics Requirement: ∆pT/pT < 10% up to 1 TeV
• Stand-alone Operation
Realization
• Air Core Toroid Magnet System
• Dimensions: 45 m × 25 m
• Area: > 5500 m2
• 788 Trigger Chambers
• 1206 Precision Chambers
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.4
Introduction (2)The ATLAS Barrel Muon Spectrometer
End-captoroid
Barrel toroidcoils
Calorimeters
MDT chambersResistive plate chambers
Inner detector
• 3 Point Sagitta Measurement
50 µm point resolution needed(including alignment across 10 m)
• 576 Trigger Chambers:
Resistive Plate Chambers (RPCs)
• 656 Precision Detectors:
Monitored Drift Tube (MDT)
Chambers
88 MDT Chambers for outer-
most (BOS) stations built at the
Max-Planck-Institut für Physik
(MPI) and Ludwig-Maximilians-
University (LMU) Munich
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.5
Introduction (3)Monitored Drift Tube Chambers
• 2 multilayer of 3 (or 4) drift
tube layers
• Support frame of aluminum
• Chamber size: 1-11 m2
Longitudinal beam
In−plane alignment
Multilayer
Cross plate
BOS MDT Chamber size: 3.8 m × 2.2 m
2 × 3 layers, 72 tubes per layer
• Drift tubes
- 3 cm diameter
- Gas mixture: Ar/CO2 = 93/7
- Pressure: 3 bar
- Gas gain: 2 × 104
- Max. drift time: ≈ 700 ns
- Resolution: < 100 µm
Monitored. . .
• Optical systems to monitor
chamber deformations
• Optical chamber to chamber
alignment
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.6
Test and Commissioning at theProduction Site
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.7
At the Production Site. . .At MPI
• Wire positions (during construction)
• Layer / multilayer parameters
(during construction)
• Inplane alignment monitor calibration
(during construction)
• Alignment platform positions
• Leak test
• Wire tension measurement
• Wire resistance measurement
• Chamber test (at storage hall)
• Longterm leak rate measurement
(at storage hall)
At LMU
• Wire resistance measurement
• Leak rate measurement
• High voltage test
• Front-end electronics test / noise test
• Cosmic Ray Calibration
- Chamber commissioning
(complete functional test, tube
response, homogeneity)
- Chamber calibration
(wire positions, geometry)
88 of 88 BOS MDT chambers built 71 BOS MDT chambers commissioned
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.8
Measurements at MPIInter-Layer Parameters Alignment Platform Positions
14.95
15.00
15.05
15.10
0 10 20 30 40 50 60 70 80
MDT Chamber
∆z /
mm
25.95
26.00
26.05
26.10
0 10 20 30 40 50 60 70 80
MDT Chamber
∆y /
mm
−20
0
20
0 10 20 30 40 50 60 70 80
MDT Chamber
∆αx
/ µ r
ad
layer5−layer6layer4−layer5layer1−layer2
layer2−layer3
z
y
92.000 mm
27.000 mm
-0.2
-0.1
0
0.1
0.2
20 30 40 50 60 70 80MDT Chamber
∆ y /
mm
mechanicalX-tomo
MDT Chamber∆ z
/ m
m
-0.2
-0.1
0
0.1
0.2
20 30 40 50 60 70 80
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.9
The LMU Cosmic Ray Facility
RasCam
NIKHEF
RasCam
NIKHEF
RasCam
NIKHEF
RasCam
NIKHEF
RasCam
NIKHEF
RasCam
NIKHEF
345.
0
3436.0
2641.0
2075.0
1520.0
670.0
0
982.5
x
z
y
Capacitec Systems
Upper ReferenceChamber
Streamer Tubes
Test Chamber
Lower Hodoscope
Upper Hodoscope
Iron Absorber
ChamberLower Reference
RasLedLongbeam
RasLedCrossbeam
RasLedCrossbeam RasLed
Longbeam
Lenses
RasCamRasCam
Lenses
BOS MDT Chamber size: 3.8 m × 2.2 m
2 × 3 layers, 72 tubes per layer
Setup
• Cosmic Ray trigger with full chamber
coverage (8.7 m2)
• Reference tracking with 2 MDT chambers
• Optical and capacitive monitoring
of relative chamber positions
(< 5 µm precision)
Methods
• Chamber Response
- Measure drift time spectra
- Derive parameter set from
fit to rising/trailing edge
• Wire position measurement
- Compare measured drift radius with
prediction from reference MDTs
- Precision: O(10µm)
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.10
Results from LMULeak Rate
00.250.5
0.751
1.251.5
1.752
0 20 40 600
0.250.5
0.751
1.251.5
1.752
0 20 40 60MDT Chamber
Lea
k ra
te /
(mb
ar/d
)
Multilayer z-Shift (HV side)
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0 20 40 60
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0 20 40 60MDT Chamber
(∆z M
L -
∆z M
L,n
om
) / m
m
Drift Properties / Homogeneity
-4
-2
0
2
4
0 20 40 60
-4
-2
0
2
4
0 20 40 60
ML1ML2
MDT Chamber
(Tm
ax -
<T
max
>) /
ns
Multilayer y-Distance (RO side)
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0 20 40 60
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0 20 40 60MDT Chamber
(∆y M
L -
∆y M
L,n
om
) / m
m
62 of 88 MDT chambers tested and analyzed
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.11
Integration and Commissioning ofATLAS Barrel Outer Small
Muon Stations at CERN
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.12
At CERN. . .
Integration
Completion of MDT chamber and
mating with trigger chamber
• Install and test additional
sensors
• Mount RPC trigger chamber
Commissioning
Guarantee required performance
of MDT chamber
• Leak test
• HV test
• Noise test
• Cosmic Ray test
Early installation of 4 BOS stations in February/March 2005
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.13
Integration (1)Survey Targets Alignment Sensors
B-Field Sensors
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.14
Integration (2)
Integration of the RPC Trigger Chamber and MDT Chamberin Common Support Frame
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.15
Integration (3)Rotation of Muon Station Sag Compensation
MDT Alignment Fully Integrated Muon Station
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.16
Commissioning — ResultsNoise Test
Wor
st C
ase
Tube Number
No
ise
Rat
e / H
z
0ML2 / L2ML1 / L3ML1 / L1 ML1 / L2 ML2 / L1 ML2 / L3
200
400
600
800
1000
1200
Mean:RMS:
1400
150 Hz85 Hz
1600
1800
2000
2200
Noise Rate − 20MMMPIC000038 (BOF1A14) − HV on
(No individual ASD threshold)
ADC Spectrum
ADC Counts
En
trie
s / 3
.3 A
DC
Co
un
ts
0 50 100 150 200 250 300 350 4000
200
400
600
800
1000
1200
1400
ADC spectrum (ns) for mezz 17 chan 19
TDC Spectrum
En
trie
s / 1
.562
5 n
s
Drift Time / ns0 200 400 600 800 1000 1200
0
50
100
150
200
250
300
350
400
TDC spectrum (ns) for tdc 17 chan 19 after ADC cut
Hit Map
En
trie
s / T
ub
e
Tube Number0 10 20 30 40 50 60 70
0
10000
20000
30000
40000
50000
60000
70000
Hit profile for ML 1, layer 1 after ADC cut
All 4 early installation BOS MDT chambers passed all tests
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.17
Summary and Outlook
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.18
Summary & Outlook (1)
Stringent tests at production sites and at CERN ensurerequired performance of ATLAS MDT chambers
• 88 BOS MDT chambers built and tested at MPI
• 71 MDT chambers commissioned and calibrated at LMU so far
- Uniform response of all chambers
- Consistent chamber geometry
• First BOS muon stations successfully integrated and tested at CERN
• 4 BOS muon stations successfully installed in ATLAS
. . .
• Integration of remaining 84 BOS muon stations was resumed last week at CERN
• Installation starting in September 2005
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.19
Summary & Outlook (2)
Thank you to all who helped building,
testing, integrating and installing,
especially S. Leber, U. Schorer,
R. Sedlmeyer, H. Wetteskind and
J. Zimmer,
U. Landgraf and S. Zimmermann
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.20
Additional Slides
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.21
Drift Time Spectra
−100 0 100 200 300 400 500 600 700 800
0.002
0.004
0.006
0.008
0.012
0
0.01 one tube
fit to spectrumaverage spectrum
Drift Time / nsN
orm
alis
ed E
ntr
ies
Leading edge
F (t) = p0 +A0
1 + exp(
t0−tT0
)
Trailing edge
G (t) = pm +αm · t + Am
1 + exp(
t−tmTm
)
Back
HEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.22
Wire Position Meas.
wire positionactual
rdriftδy
rref
nominalwire position
δz z
y µ
y = y0 + m-1 · z
• Wire positions derived fromcomparison of predicted driftradius rref (weighted averagereference tracks) andmeasured drift radius rdriftin the test chamber∆r = rdrift − rref ≈ δz − m · δy
• δy from linear fit of ∆r vs. m
• δz from 〈∆r′〉 = δz − 〈m〉 · δ ′y ≈ δz(∆r′ with corrected y pos.)
• Grid scaling factor γ :z(n) = z0 + γ · gnom · n
BackHEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.23
Performance
(znom − ztomo ) / µm
(zno
m −
zco
smic
ray
) / µ
m
−50 −40 −30 −20 −10 0 10 20 30 40 50−50
−40
−30
−20
−10
0
10
20
30
40
50
lower multilayer
upper multilayer
BOS5A08(Exceptional chamber with
known production error)
Comparison of measurements ofCosmic Ray Facility with X-RayTomograph gives accuracy
• Perpend. to chamber plane- δy: 25 µm- δy, Layer: 4.5 µm- αx, Layer: 17 µrad
• In chamber plane- δz: 8 µm- δz, Layer: 2 µm- g: 0.15 µm
• Agreement with Monte Carlo
BackHEP2005—23rd July, 2005 Test, Integration and Commissioning of MDT Chambers for the ATLAS Muon Spectrometer MPI and LMU München – p.24
OverviewIntroductionIntroduction (1)Introduction (2)Introduction (3)Test and Commissioning at the Production SiteAt the Production Siteldots Measurements at MPIThe LMU Cosmic Ray FacilityResults from LMUIntegration and Commissioning of ATLAS Barrel Outer Small\[0.2cm] Muon Stations at CERNAt CERNldots Integration (1)Integration (2)Integration (3)Commissioning --- ResultsSummary and OutlookSummary & Outlook (1)Summary & Outlook (2)Additional SlidesDrift Time SpectraWire Position Meas.Performance