14/11/03 CERN-ilo presentation C.Kourkoumelis,UoA 1 ATLAS Muon Drift Tube wiring and testing in Greece Joint effort UoA+NTUA* Athens,14/11/0 Christine KOURKOUMELIS University of Athens *supported by the GGET-Micromechanics and Microelectronics program
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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.
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• 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
14/11/03 CERN-ilo presentation
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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
NTUniversity of Athens : Muon tube testing facilityNTUniversity of Athens : Muon tube testing facility
14/11/03 CERN-ilo presentation
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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.
NTUniversity of Athens : Muon tube testing facilityNTUniversity of Athens : Muon tube testing facility
14/11/03 CERN-ilo presentation
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Anode Wire PositionAnode Wire Position measurement
0 0 02
1ln sin sinn i fa t t
d
MDT-axisMDT-axis
NTUniversity of Athens : Muon tube testing facilityNTUniversity of Athens : Muon tube testing facility
14/11/03 CERN-ilo presentation
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Anode Wire PositionAnode Wire Position measurement
14/11/03 CERN-ilo presentation
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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
14/11/03 CERN-ilo presentation
C.Kourkoumelis,UoA 22
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
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60
80
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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 @ home institutionsBIS tests @ home institutionsBIS tests @ home institutionsBIS tests @ home institutionsNTU SETUP / NEUTRON DATANTU SETUP / NEUTRON DATA
@ DEMOKRITOS@ DEMOKRITOS
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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
14/11/03 CERN-ilo presentation
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BIS chamber integration-servicesBIS chamber integration-servicesBIS chamber integration-servicesBIS chamber integration-services
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Cosmic ray set-up @ CERN to test several chambers simultaneously
100 chambers are already constructed, should be equipped and tested
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AFTER installation (BEFORE data taking):
+physics studies…
•Cabling
•Debugging electronics etc
•Integrate/commission
(Manpower/travelling..)
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C.Kourkoumelis,UoA 29
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