1-4 april 2004hep 2004 d.fassouliotis, uoa atlas muon chambers construction in greece dimitris...

1-4 April 2004 HEP 2004 D.Fassouliotis, UoA

ATLAS Muon Chambers Construction in Greece

Dimitris Fassouliotis

Conference on

RECENT ADVANCES IN PARTICLE AND ASTROPARTICLE PHYSICS

HELLENIC SOCIETY FOR THE STUDY OF HIGH ENERGY PHYSICS

University of the Aegean


Outline

• Why?• How?• The ATLAS Muon Greek Laboratories • The Present Status of the Greek Project• The close future … providing the chamber services … test everything• Parallel activities


The ATLAS Detector


Aim: new discoveries

Higgs ZZ 4 μ


AimSM Higgs Discovery/Measurement

H (130 GeV)->ZZ*-> 4 μσmass= 1.4 GeV/c2

H (300 GeV)-> ZZ -> 4 μS/B for 10 fb-1

H (600 GeV)-> WW -> lν jjS/B for 100 fb-1


AimElectroweak and B Physics

W transverse mass Aim forΔΜW<20 MeV/c2

J/ψ ->2 μσmass= 40 MeV/c2

B+ -> J/ψ(μμ)K+

σmass= 26 MeV/c2

S/B for 30 fb-1


AimSUSY searches e.t.c.

H/A(300 GeV)->2 μS/B for 30 fb-1

σmass~11 GeV/c2

Mll

Slepton mass determ. Resolution 1.3 GeV/c2

S/B for 100 fb-1

Mllq

Squark searchCascade decays Endpoint fit

llllR01

02

~~~ lqlqllqq RL

01

02

~~~~


Muon Spectrometer PT resolution

Performance Requirementsfor such a rich physics program

Combined with ID PT resolution

Efficiency vs PT


Precision in alignment (monitoring the detector position to 30μm)

Precision in construction (control detector deformations below 20μm)

The Challenge

http://atlas.web.cern.ch/Atlas/SUB_DETECTORS/DetStatus/muonchambers/alignment/align1.jpg


The Greek Muon Chambers (BIS)

The three Greek Laboratories:

Barrel Inner Small Chambers

• University of Athens (UoA) MDT tube assembly

• National Technical University of Athens(NTUA) Quality Assurance/Quality Control of MDT tubes

• Aristotle University of Thessaloniki (AUTh) MDT chamber assembly

Transverse view of the Muon Spectrometer


The Greek ATLAS Muon Collaborating institudes

UoA• C. Kourkoumelis• P. Ioannou• D. Fassouliotis• I. Hatziantonaki• K. Nikolopoulos• D. Pappas• D. Agriogiannis

NTUA• M. Dris• A. Filippas• E. Gazis• T. Alexopoulos• E. Katsoufis• T. Papadopoulou• E. Fokitis• Y. Tsipolitis • S. Maltezos• A. Tzamarioudaki• P. Savva

AUTh• Ch. Petridou• T. Liolios• M. Manolopoulou • S. Dedousis• M. Chardalas• D. Sampsonidis• T. Lagouri• K. Ypsilantis • A. Krepouri• C. Lamboudis• K. Economou • K. Filippousis


UoA – The tube assembly facility

The upgraded Wiring table at UoA

Tooling for crimping the copper pin of the endplug

Tooling for crimping the wire

MDT tube with the endplugs and the wire


22000 tubes

Mean tube length 1671.5mm RMS 20μm

• QA/QC : Tube length measurement

UoA – The tube assembly facility

The tube assembly procedure with automatic data recording as seen by

the operator


Wire position measurement

20μm 20μm

Dark Current and Wire Tension Measurements

<Δz>=<Δy>=4.3μm

NTUA -The QA/QC MDT Facility


Gas Leak Test set-up

NTUA -The QA/QC MDT Facility


AUTH - MDT Chamber construction

Class 50000 Temperature 0.50C Humidity 5%


•The relative layer position of each tube layer is controlled to better than ±10 μm

Y-d

irec

tion

(μ

m)

Tube position in each layer

Online QA/QC, Data login by operator

AUTH - MDT Chamber construction

σ = 5.1 μm

σ = 5.7 μm RASNIK Towers Results on 112 chambers

Y-d

irec

tion

(m

m)

X-direction (mm)


800 tubes/month

Tube and chamber production

4 years of continuous production: 30000 tubes assembled


Tube QAQC resultsCategory Number of tubes Percentage (%)

Total 28700 100.00

Good 28455 99.15

Crimping 25 0.08

Wire broken 11 0.04

Length finished 10 0.04

Leak current 13 0.04

Gas leak 108 0.38

Wire location 20 0.07

Wire tension 58 0.20


X-ray Tomograph ResultsChecked Chambers < 20.0µm

BIS 1C THE 095. January 2004. 12.7 ÷ 14.4µm

BIS 4A THE 062. May 2003. 9.7 ÷ 13.9µm

BIS 2A THE 042. May 2003. 11.5 ÷ 14.0µm

BIS 6A THE 078. April 2003. 11.0 ÷ 14.5µm

THE 022 . August 2002. 11.1 ÷ 14.5µm

THE 018 . March 2002. 11.1 ÷ 14.5µm

THE 024 . March 2002. 11.1 ÷ 14.5µm

BIS EVROPI. April 2001. 11.6 ÷ 13.9µm

BIS CAMILLE. July 2000. 11.0 ÷ 16.2µm

BIS BEATRICE. June 2000. 12.9 ÷ 16.8µm

BIS ARTEMIS . August 1999. 15.7 ÷ 18.2µm

http://xtomo.home.cern.ch/xtomo/Results/Thessaloniki/BIS_THE022_2002_08



http://xtomo.home.cern.ch/xtomo/Results/Thessaloniki/BIS_Evropi_2001_04


Present Status

So …112 excellent BIS chambers are ready.

I hope you are convinced that the first phase of the project has been very successfully accomplished.

But…


As a Greek proverb says : We have eaten the donkey…


… and remains the tail


However … it’s a long tail !


…providing the services


End-plug assembly procedureMeasure end-plug diameter Clean all components in ultrasonic bath with 100% ethyl alcohol.Insert twister / stopperInsert springInsert/crimp copper pinInsert O-ring

Daily operational tasksVerification of 200 and 8 Atm pressures Calibration of mechanical tension meterCalibration of Tube Length fixing systemCalibration of Tube length measurement system 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 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 inspection/Clean if needed

Wire verification Visual inspectionThrow part if needed

Tube Assembly (A parenthesis)


…providing the servicesthe procedure

Preparatory activities

Gas leak test

Installation 1 (before gas leak)

Installation 2 (after gas leak)

Electronic Noise test

Cosmic Ray test

Database

All Chambers should

be fully equipped and

qualified by the end of

February 2005

4.5-5.0 man-years

78 Chambers at CERN 34 at Thessaloniki


BIS completion

Gas Leak measurements with differential manometer

•Faraday Cages

•Gas system

•Electronics


Parallel ActivitiesSoftware and Analysis on Physics channels with muons

SM Higgs Search• Combination of Muon and ID info (resolution improvement of ~30%)• Z Constraint Fit application with BW Z distribution (resolution improvement of ~15%)• Investigation of Misalignment effects on resolution and acceptance Use of Z -> 2 μ for detector calibration MSSM H/A -> 2 μ Search


Parallel Activities II Contribution to Moore / MuId (Muon Reconstruction ATLAS software) Low PT muon tagging Participation to Muon DCS group Study of the response of MDTs to neutrons Ageing studies using alpha particle irradiation Setup of cosmic ray telescopes GRID applications• Participation to Cross-Grid European program• Implementation of LCG 2 computing environment• Aim to participate to ATLAS Data Challenges • However there are not enough resources available• Hellas GRID implementation very slow


SummaryThe first phase of the Greek ATLAS Muon project has been completed extremely successfully. 112 excellent bare chambers are ready.It is the first time that Greece has such a major contribution to such a large international experimental collaboration. However, a lot of delicate work is still ahead, in order to complete the chambers with the gas, electronics and sensor components. The same determination and effectiveness together with the provision of the needed resources will guarantee the successful accomplishment of the whole project. Work has been started and continues stronger, to gain the physics wise benefits of this tremendous effort.


…providing the services Preparatory Activities

Prepare Gas Bars (4/chamber, 120 tubes/Bar, 3 o-rings/tube) Test Gas Bars Prepare Piping for Gas Bar connection Prepare B Field sensor cables Prepare Alignment cables Prepare Temperature cables Prepare/buy Read-Out cables Prepare/buy HV cables Label all cables


…providing the servicesInstallation I

Screw Ground Plates (exact placement important) Screw ground pins level 2 Set o-rings on tubes Install gas bar Screw signal caps with o-rings (exact torque important) Screw remaining ground pins• Install gas piping for gas bar to gas entrance


…providing the servicesGas Leak Test

Supply gas Ar-CO2 3 Atm Verify “1st level” gas leak with gas detector Enter chamber in thermal insulating area Perform gas leak test Gas secure the detector


…providing the servicesInstallation II

Install the Hedgehog cards (RO-HV) Test each individual channel for electrical characteristics Fix remaining parts of Faraday cage Fix Brackets Glue temperature sensors Fix B Field sensors Fix alignment elements Secure mezzanines on Faraday cages Install mezzanines Provide cabling


…providing the servicesNoise test

Provide HV/ measure dark current Stand alone Data taking with random trigger Spot Noisy or inefficient channels Take action / keep info in database Verify operation of all DCS related sensors (B-Field, Temperature, Alignment sensors)


…providing the servicesCosmic Ray Test

Fully operational chamber Scintilator Trigger “Final like” Data acquisition “Final like” DCS Data run with Cosmics Final Qualification of chamber with all services Keep relevant information in DB

1-4 april 2004hep 2004 d.fassouliotis, uoa atlas muon chambers construction in greece dimitris...

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