test, integration and commissioning of monitored drift ...€¦ · test, integration and...

Test, Integration andCommissioning of Monitored Drift

Tube Chambers for the ATLASBarrel Muon Spectrometer

HEP 2005, Lisboa

23rd July, 2005

Jörg Dubbert

[email protected]

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


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


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


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


Test and Commissioning at theProduction Site


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


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


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)


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


(∆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


(∆y M

L -

∆y M

L,n

om

) / m

m

62 of 88 MDT chambers tested and analyzed


Integration and Commissioning ofATLAS Barrel Outer Small

Muon Stations at CERN


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


Integration (1)Survey Targets Alignment Sensors

B-Field Sensors


Integration (2)

Integration of the RPC Trigger Chamber and MDT Chamberin Common Support Frame


Integration (3)Rotation of Muon Station Sag Compensation

MDT Alignment Fully Integrated Muon Station


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


Summary and Outlook


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


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


Additional Slides


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


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

test, integration and commissioning of monitored drift ...€¦ · test, integration and...

Documents