14/11/03 CERN-ilo presentationC.Kourkoumelis,UoA1 ATLAS Muon Drift Tube wiring and testing in Greece Joint effort UoA+NTUA* Athens,14/11/03 Christine KOURKOUMELIS

14/11/03 CERN-ilo presentation C.Kourkoumelis,UoA 1

ATLAS Muon Drift Tube wiring and testing in Greece

Joint effort UoA+NTUA*

Athens,14/11/03

Christine KOURKOUMELIS

University of Athens

*supported by the GGET-Micromechanics and Microelectronics program

14/11/03 CERN-ilo presentation

C.Kourkoumelis,UoA 2



ATLAS MUON SPECTROMETER(View of non-trigger chambers)

Chambers beingconstructed bythe three Greekinstitutions



MDT

MDT

TGC

RPC

CSC

Monitored Drift Tubes ( |η| < 2 ) with a single wire resolution of 80 μm 1194 chambers, 5500m2

GREECE is constructing 12%Cathode Strip Chambers (2 < |η| < 2.7) at higher particle fluxes 32 chambers, 27 m2

Resistive Plate Chambers (|η| < 1.05)with a good time resolution of 1 ns 1136 chambers, 3650 m2

Thin Gap Chambers (1.05 < |η| < 2.4) at higher particle fluxes 1584 chambers, 2900 m2

Precision chambers

Trigger chambers

ATLAS: Muon Chambers Each detector has 3 stations. Each station consists of 2-4 layers.



: MDTsMonitored Drift Tubes

width (tube length) : 83-494 cmlength : 90-216 cm

Tube : Al, 30 mm φ, 0.4 mm wall

Wire : 50 μm, W/Re alloy (97/3)

Gas : Ar/CO2 (93%/7%) at 3 bar

Gas gain : 2x104 at 3080 V

Maximum drift time : ~ 700 ns

Resolution : 80 μm



mH=130 GeV σ = 2.0

mH=130 GeVσ = 2.4 (+20%)

Physics justification for precision in muon chambers



UoA : tube wiring + QA/QC (30,000 tubes)NTUA : tube QC/QA (certification)AUTh : chamber building (see D.Samponidis’ talk)

4+4 layers of tubes

BIS contruction-Greek project



Construction precision requirements/specifications for MDT tubesConstruction precision requirements/specifications for MDT tubes

To comply with the above : precision tooling, clean rooms,intense QA/QC tests, etc.. @ all three institutions

Anode Wire PositionAnode Wire Position ( 25 25 μμm)m)

Gas Leak RateGas Leak Rate (<2*10-8 bar*lit/sec)

High Voltage Leak CurrentHigh Voltage Leak Current (<2nA/meter)

Anode Wire Mechanical Anode Wire Mechanical TensionTension (350 gf 350 gf 5% 5% )



http://www.phys.uoa.gr/Atlas/MDT/

U. of Athens ATLAS_MUON GroupU. of Athens ATLAS_MUON GroupU. of Athens ATLAS_MUON GroupU. of Athens ATLAS_MUON Group

C.KourkoumelisC.Kourkoumelis

P. Ioannou

D. Fassouliotis I. Chatziantonaki

S. Stefanidis

K. Nikolopoulos

D. Pappas

D.A. Agriogiannis

S. Tatsis



University of Athens : Muon tube wiring facilityUniversity of Athens : Muon tube wiring facility

(http://www.phys.uoa.gr/Atlas/MDT)

http://pfzema.cs.infn.it/pfzema/phys/photos/ATLAS-Athens/index.html




http://pfzema.cs.infn.it/pfzema/phys/photos/ATLAS-Athens/index.html



Wire insertion –wire tensioning


Wire threading- wire tensioning



Tube production quality checks

Wiring tensionFinished tube length



DRIFT TUBE PRODUCTION IN THE UoAWORKING CONTINOUSLY SINCE Sept. 2000

STEADY PRODUCTION OF

42 tubes/day



NTU-Athens HEP GroupNTU-Athens HEP GroupNTU-Athens HEP GroupNTU-Athens HEP Group

M. DrisM. Dris E.C. Katsoufis

T.A. Filippas S. Maltezos

T. Alexopoulos T. Papadopoulou

E. Fokitis Y. Tsipolitis

E.N. Gazis E. TzamariudakiR.M. Avramidou

N. Benekos

P. Savva

A. Maltezos

N. Papadakis

N. Vodinas



Anode Wire Mechanical TensionAnode Wire Mechanical Tension measurement

.

T = D2 L2 f 2

• L= 165 cm is the wire length• D= 50 μm is the wire diameter ρ = 19.3 gr/cm3 is the density of the wire material

Nominal ValueNominal Value

NTUniversity of Athens : Muon tube testing facilityNTUniversity of Athens : Muon tube testing facility



High Voltage Leak CurrentHigh Voltage Leak Current measurement• A bunch of 16 tubes is connected

in parallel and supplied by the gas mixture Ar:CO2 (93:7) at 3 bar absolute pressure and high tension of 3400 V.•The voltage drop across a resistor of 1.1 MΩ in series with the tubes is being measured for each tube.

Leak Current < Leak Current < 2nA/m2nA/m




Gas Leak RateGas Leak Rate measurement

• The idea is to fill the tubes with the detector gas (Ar:93 %, CO2:7 %) and then measure the pressure drop due to gas leakage at the time interval t. • V is the volume of the "leaking" tube and • Δp is the pressure drop.




Anode Wire PositionAnode Wire Position measurement

0 0 02

1ln sin sinn i fa t t

d

MDT-axisMDT-axis




Anode Wire PositionAnode Wire Position measurement



BIS quality tests @ CERN BIS quality tests @ CERN (1(1stst chamber –out of 12 chamber –out of 12

construction sites -to meet construction requirements) construction sites -to meet construction requirements) BIS quality tests @ CERN BIS quality tests @ CERN (1(1stst chamber –out of 12 chamber –out of 12

construction sites -to meet construction requirements) construction sites -to meet construction requirements)

X-RAY TOMOGRAPHYX-RAY TOMOGRAPHY

The results meet The results meet the ATLAS the ATLAS specifications !!!specifications !!!

April-01 April-01 11.7 ÷ 13.9 µm 11.7 ÷ 13.9 µm

July-00July-00 11.0 ÷ 16.2 µm 11.0 ÷ 16.2 µm



BIS chamber construction in GreeceBIS chamber construction in GreeceBIS chamber construction in GreeceBIS chamber construction in Greece

Has been going extremely well for more than 3 years-will finish soon (by next April) !

Greece (112 BIS)

28-10-04

0

20

40

60

80

100

120

140

Jan-00 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05Time

No

. C

ham

ber

s

Bare MDTPlan Bare MDTMDT with FCPlan MDT with FCFinal MDTPlan Final MDTReady for Installation MS



BIS tests @ CERN’s-testbeamsBIS tests @ CERN’s-testbeamsBIS tests @ CERN’s-testbeamsBIS tests @ CERN’s-testbeamsX5/GIF X5/GIF 2002 2002



UoA cosmic rays set-up

BIS tests @ home institutionsBIS tests @ home institutionsBIS tests @ home institutionsBIS tests @ home institutionsNTU SETUP / NEUTRON DATANTU SETUP / NEUTRON DATA

@ DEMOKRITOS@ DEMOKRITOS



WHAT IS NEXT?? (started during summer)

NOW till SUMMER 2004•Equip the chambers with services ( gas, electronics..)

•Test EVERY chamber with cosmic rays

•BE READY FOR INSTALLATION at the pit by Aug.2004 (Olympic games)- 130 chambers



BIS chamber integration-servicesBIS chamber integration-servicesBIS chamber integration-servicesBIS chamber integration-services



Cosmic ray set-up @ CERN to test several chambers simultaneously

100 chambers are already constructed, should be equipped and tested



AFTER installation (BEFORE data taking):

+physics studies…

•Cabling

•Debugging electronics etc

•Integrate/commission

(Manpower/travelling..)



Summary:Thanks to support from the Micro program we were able to :

•Build infrastructure in our home institutions for precise micromechanical construction and testing of particle detectors at large scale

•Collaborate successfully with the industry

•Build a large part of a detector and thus participate on equal basis in the world’s largest HEP experiment

In the future:•Should take advantage of the investment..

•Finish detector (technical manpower at CERN)

•Participate in tests, data taking, commissioning, physics studies etc

•Continue collaboration with industry/transfer of know-how

Documents

14/11/03 CERN-ilo presentationC.Kourkoumelis,UoA1 ATLAS Muon Drift Tube wiring and testing in Greece Joint effort UoA+NTUA* Athens,14/11/03 Christine KOURKOUMELIS