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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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
The ATLAS Detector
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
Aim: new discoveries
Higgs ZZ 4 μ
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
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
~~~~
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
Muon Spectrometer PT resolution
Performance Requirementsfor such a rich physics program
Combined with ID PT resolution
Efficiency vs PT
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
Precision in alignment (monitoring the detector position to 30μm)
Precision in construction (control detector deformations below 20μm)
The Challenge
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
Wire position measurement
20μm 20μm
Dark Current and Wire Tension Measurements
<Δz>=<Δy>=4.3μm
NTUA -The QA/QC MDT Facility
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
Gas Leak Test set-up
NTUA -The QA/QC MDT Facility
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
AUTH - MDT Chamber construction
Class 50000 Temperature 0.50C Humidity 5%
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
•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)
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
800 tubes/month
Tube and chamber production
4 years of continuous production: 30000 tubes assembled
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
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…
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
As a Greek proverb says : We have eaten the donkey…
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
… and remains the tail
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
However … it’s a long tail !
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
…providing the services
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
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)
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
…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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
BIS completion
Gas Leak measurements with differential manometer
•Faraday Cages
•Gas system
•Electronics
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
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.
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
…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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
…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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
…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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
…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
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
…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)
1-4 April 2004 HEP 2004 D.Fassouliotis, UoA
…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